diff --git a/SpotifyAPI.Web.Auth/AuthException.cs b/SpotifyAPI.Web.Auth/AuthException.cs
index 06fe4720..41e1bdf3 100644
--- a/SpotifyAPI.Web.Auth/AuthException.cs
+++ b/SpotifyAPI.Web.Auth/AuthException.cs
@@ -14,7 +14,7 @@ namespace SpotifyAPI.Web.Auth
         System.Runtime.Serialization.SerializationInfo info,
         System.Runtime.Serialization.StreamingContext context) : base(info, context) { }
 
-    public string Error { get; set; }
-    public string State { get; set; }
+    public string? Error { get; set; }
+    public string? State { get; set; }
   }
 }
diff --git a/SpotifyAPI.Web.Auth/EmbedIOAuthServer.cs b/SpotifyAPI.Web.Auth/EmbedIOAuthServer.cs
index b5a625a5..97cb7d99 100644
--- a/SpotifyAPI.Web.Auth/EmbedIOAuthServer.cs
+++ b/SpotifyAPI.Web.Auth/EmbedIOAuthServer.cs
@@ -12,13 +12,13 @@ namespace SpotifyAPI.Web.Auth
 {
   public class EmbedIOAuthServer : IAuthServer
   {
-    public event Func<object, AuthorizationCodeResponse, Task> AuthorizationCodeReceived;
-    public event Func<object, ImplictGrantResponse, Task> ImplictGrantReceived;
+    public event Func<object, AuthorizationCodeResponse, Task>? AuthorizationCodeReceived;
+    public event Func<object, ImplictGrantResponse, Task>? ImplictGrantReceived;
 
     private const string AssetsResourcePath = "SpotifyAPI.Web.Auth.Resources.auth_assets";
     private const string DefaultResourcePath = "SpotifyAPI.Web.Auth.Resources.default_site";
 
-    private CancellationTokenSource _cancelTokenSource;
+    private CancellationTokenSource? _cancelTokenSource;
     private readonly WebServer _webServer;
 
     public EmbedIOAuthServer(Uri baseUri, int port)
@@ -76,7 +76,7 @@ namespace SpotifyAPI.Web.Auth
 
     public Task Stop()
     {
-      _cancelTokenSource.Cancel();
+      _cancelTokenSource?.Cancel();
       return Task.CompletedTask;
     }
 
diff --git a/SpotifyAPI.Web.Auth/Models/Response/AuthorizationCodeResponse.cs b/SpotifyAPI.Web.Auth/Models/Response/AuthorizationCodeResponse.cs
index 224b4063..13d43608 100644
--- a/SpotifyAPI.Web.Auth/Models/Response/AuthorizationCodeResponse.cs
+++ b/SpotifyAPI.Web.Auth/Models/Response/AuthorizationCodeResponse.cs
@@ -9,7 +9,7 @@ namespace SpotifyAPI.Web.Auth
       Code = code;
     }
 
-    public string Code { get; set; }
-    public string State { get; set; }
+    public string Code { get; set; } = default!;
+    public string State { get; set; } = default!;
   }
 }
diff --git a/SpotifyAPI.Web.Auth/Models/Response/ImplicitGrantResponse.cs b/SpotifyAPI.Web.Auth/Models/Response/ImplicitGrantResponse.cs
index cc27b6ca..2950923e 100644
--- a/SpotifyAPI.Web.Auth/Models/Response/ImplicitGrantResponse.cs
+++ b/SpotifyAPI.Web.Auth/Models/Response/ImplicitGrantResponse.cs
@@ -14,10 +14,10 @@ namespace SpotifyAPI.Web.Auth
       ExpiresIn = expiresIn;
     }
 
-    public string AccessToken { get; set; }
-    public string TokenType { get; set; }
+    public string AccessToken { get; set; } = default!;
+    public string TokenType { get; set; } = default!;
     public int ExpiresIn { get; set; }
-    public string State { get; set; }
+    public string State { get; set; } = default!;
 
     /// <summary>
     ///   Auto-Initalized to UTC Now
diff --git a/SpotifyAPI.Web.Auth/SpotifyAPI.Web.Auth.csproj b/SpotifyAPI.Web.Auth/SpotifyAPI.Web.Auth.csproj
index 3472e69c..ef329856 100644
--- a/SpotifyAPI.Web.Auth/SpotifyAPI.Web.Auth.csproj
+++ b/SpotifyAPI.Web.Auth/SpotifyAPI.Web.Auth.csproj
@@ -1,6 +1,8 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <TargetFrameworks>netstandard2.1;netstandard2.0</TargetFrameworks>
+    <LangVersion>8.0</LangVersion>
+    <Nullable>enable</Nullable>
     <PackageId>SpotifyAPI.Web.Auth</PackageId>
     <Title>SpotifyAPI.Web.Auth</Title>
     <Authors>Jonas Dellinger</Authors>
diff --git a/SpotifyAPI.Web.Examples/Example.CLI.PersistentConfig/Example.CLI.PersistentConfig.csproj b/SpotifyAPI.Web.Examples/Example.CLI.PersistentConfig/Example.CLI.PersistentConfig.csproj
index ddfa049b..608c17db 100644
--- a/SpotifyAPI.Web.Examples/Example.CLI.PersistentConfig/Example.CLI.PersistentConfig.csproj
+++ b/SpotifyAPI.Web.Examples/Example.CLI.PersistentConfig/Example.CLI.PersistentConfig.csproj
@@ -3,6 +3,8 @@
   <PropertyGroup>
     <OutputType>Exe</OutputType>
     <TargetFramework>netcoreapp3.1</TargetFramework>
+    <LangVersion>8.0</LangVersion>
+    <Nullable>enable</Nullable>
   </PropertyGroup>
 
   <ItemGroup>
diff --git a/SpotifyAPI.Web.Examples/Example.CLI.PersistentConfig/Program.cs b/SpotifyAPI.Web.Examples/Example.CLI.PersistentConfig/Program.cs
index aec0ac8f..293e28bf 100644
--- a/SpotifyAPI.Web.Examples/Example.CLI.PersistentConfig/Program.cs
+++ b/SpotifyAPI.Web.Examples/Example.CLI.PersistentConfig/Program.cs
@@ -1,4 +1,3 @@
-using System.Diagnostics;
 using System.IO;
 using System.Threading.Tasks;
 using System;
@@ -18,12 +17,19 @@ namespace Example.CLI.PersistentConfig
   public class Program
   {
     private const string CredentialsPath = "credentials.json";
-    private static readonly string clientId = Environment.GetEnvironmentVariable("SPOTIFY_CLIENT_ID");
-    private static readonly string clientSecret = Environment.GetEnvironmentVariable("SPOTIFY_CLIENT_SECRET");
-    private static EmbedIOAuthServer _server;
+    private static readonly string? clientId = Environment.GetEnvironmentVariable("SPOTIFY_CLIENT_ID");
+    private static readonly string? clientSecret = Environment.GetEnvironmentVariable("SPOTIFY_CLIENT_SECRET");
+    private static readonly EmbedIOAuthServer _server = new EmbedIOAuthServer(new Uri("http://localhost:5000/callback"), 5000);
 
     public static async Task<int> Main()
     {
+      if (string.IsNullOrEmpty(clientId) || string.IsNullOrEmpty(clientSecret))
+      {
+        throw new NullReferenceException(
+          "Please set SPOTIFY_CLIENT_ID and SPOTIFY_CLIENT_SECRET via environment variables before starting the program"
+        );
+      }
+
       if (File.Exists(CredentialsPath))
       {
         await Start();
@@ -42,7 +48,7 @@ namespace Example.CLI.PersistentConfig
       var json = await File.ReadAllTextAsync(CredentialsPath);
       var token = JsonConvert.DeserializeObject<AuthorizationCodeTokenResponse>(json);
 
-      var authenticator = new AuthorizationCodeAuthenticator(clientId, clientSecret, token);
+      var authenticator = new AuthorizationCodeAuthenticator(clientId!, clientSecret!, token);
       authenticator.TokenRefreshed += (sender, token) => File.WriteAllText(CredentialsPath, JsonConvert.SerializeObject(token));
 
       var config = SpotifyClientConfig.CreateDefault()
@@ -61,11 +67,10 @@ namespace Example.CLI.PersistentConfig
 
     private static async Task StartAuthentication()
     {
-      _server = new EmbedIOAuthServer(new Uri("http://localhost:5000/callback"), 5000);
       await _server.Start();
       _server.AuthorizationCodeReceived += OnAuthorizationCodeReceived;
 
-      var request = new LoginRequest(_server.BaseUri, clientId, LoginRequest.ResponseType.Code)
+      var request = new LoginRequest(_server.BaseUri, clientId!, LoginRequest.ResponseType.Code)
       {
         Scope = new List<string> { UserReadEmail, UserReadPrivate, PlaylistReadPrivate }
       };
@@ -85,7 +90,7 @@ namespace Example.CLI.PersistentConfig
     {
       await _server.Stop();
       AuthorizationCodeTokenResponse token = await new OAuthClient().RequestToken(
-        new AuthorizationCodeTokenRequest(clientId, clientSecret, response.Code, _server.BaseUri)
+        new AuthorizationCodeTokenRequest(clientId!, clientSecret!, response.Code, _server.BaseUri)
       );
 
       await File.WriteAllTextAsync(CredentialsPath, JsonConvert.SerializeObject(token));
diff --git a/SpotifyAPI.Web.Tests/Clients/UserProfileClientTest.cs b/SpotifyAPI.Web.Tests/Clients/UserProfileClientTest.cs
index a5dd4232..de51084e 100644
--- a/SpotifyAPI.Web.Tests/Clients/UserProfileClientTest.cs
+++ b/SpotifyAPI.Web.Tests/Clients/UserProfileClientTest.cs
@@ -28,7 +28,7 @@ namespace SpotifyAPI.Web
 
       await client.Get(userId);
 
-      api.Verify(a => a.Get<PublicUser>(SpotifyUrls.User("userId")), Times.Once);
+      api.Verify(a => a.Get<PublicUser>(SpotifyUrls.User(userId)), Times.Once);
     }
   }
 }
diff --git a/SpotifyAPI.Web/Clients/OAuthClient.cs b/SpotifyAPI.Web/Clients/OAuthClient.cs
index 14558665..e6e92ab2 100644
--- a/SpotifyAPI.Web/Clients/OAuthClient.cs
+++ b/SpotifyAPI.Web/Clients/OAuthClient.cs
@@ -101,6 +101,7 @@ namespace SpotifyAPI.Web
     private static APIConnector ValidateConfig(SpotifyClientConfig config)
     {
       Ensure.ArgumentNotNull(config, nameof(config));
+
       return new APIConnector(
         config.BaseAddress,
         config.Authenticator,
diff --git a/SpotifyAPI.Web/Clients/SpotifyClientConfig.cs b/SpotifyAPI.Web/Clients/SpotifyClientConfig.cs
index 6223b180..75bc7881 100644
--- a/SpotifyAPI.Web/Clients/SpotifyClientConfig.cs
+++ b/SpotifyAPI.Web/Clients/SpotifyClientConfig.cs
@@ -7,11 +7,11 @@ namespace SpotifyAPI.Web
   public class SpotifyClientConfig
   {
     public Uri BaseAddress { get; private set; }
-    public IAuthenticator Authenticator { get; private set; }
+    public IAuthenticator? Authenticator { get; private set; }
     public IJSONSerializer JSONSerializer { get; private set; }
     public IHTTPClient HTTPClient { get; private set; }
-    public IHTTPLogger HTTPLogger { get; private set; }
-    public IRetryHandler RetryHandler { get; private set; }
+    public IHTTPLogger? HTTPLogger { get; private set; }
+    public IRetryHandler? RetryHandler { get; private set; }
     public IPaginator DefaultPaginator { get; private set; }
 
     /// <summary>
@@ -26,11 +26,11 @@ namespace SpotifyAPI.Web
     /// <param name="defaultPaginator"></param>
     public SpotifyClientConfig(
       Uri baseAddress,
-      IAuthenticator authenticator,
+      IAuthenticator? authenticator,
       IJSONSerializer jsonSerializer,
       IHTTPClient httpClient,
-      IRetryHandler retryHandler,
-      IHTTPLogger httpLogger,
+      IRetryHandler? retryHandler,
+      IHTTPLogger? httpLogger,
       IPaginator defaultPaginator
     )
     {
diff --git a/SpotifyAPI.Web/Exceptions/APIException.cs b/SpotifyAPI.Web/Exceptions/APIException.cs
index ebfe182d..2de67e42 100644
--- a/SpotifyAPI.Web/Exceptions/APIException.cs
+++ b/SpotifyAPI.Web/Exceptions/APIException.cs
@@ -7,9 +7,9 @@ using System.Runtime.Serialization;
 namespace SpotifyAPI.Web
 {
   [Serializable]
-  public class APIException : System.Exception
+  public class APIException : Exception
   {
-    public IResponse Response { get; set; }
+    public IResponse? Response { get; set; }
 
     public APIException(IResponse response) : base(ParseAPIErrorMessage(response))
     {
@@ -26,7 +26,7 @@ namespace SpotifyAPI.Web
     {
     }
 
-    public APIException(string message, System.Exception innerException) : base(message, innerException)
+    public APIException(string message, Exception innerException) : base(message, innerException)
     {
     }
 
@@ -35,7 +35,7 @@ namespace SpotifyAPI.Web
       Response = info.GetValue("APIException.Response", typeof(IResponse)) as IResponse;
     }
 
-    private static string ParseAPIErrorMessage(IResponse response)
+    private static string? ParseAPIErrorMessage(IResponse response)
     {
       var body = response.Body as string;
       if (string.IsNullOrEmpty(body))
@@ -44,7 +44,7 @@ namespace SpotifyAPI.Web
       }
       try
       {
-        JObject bodyObject = JObject.Parse(body);
+        JObject bodyObject = JObject.Parse(body!);
         JObject error = bodyObject.Value<JObject>("error");
         if (error != null)
         {
diff --git a/SpotifyAPI.Web/Http/APIConnector.cs b/SpotifyAPI.Web/Http/APIConnector.cs
index 261fe139..00a25022 100644
--- a/SpotifyAPI.Web/Http/APIConnector.cs
+++ b/SpotifyAPI.Web/Http/APIConnector.cs
@@ -9,22 +9,22 @@ namespace SpotifyAPI.Web.Http
   public class APIConnector : IAPIConnector
   {
     private readonly Uri _baseAddress;
-    private readonly IAuthenticator _authenticator;
+    private readonly IAuthenticator? _authenticator;
     private readonly IJSONSerializer _jsonSerializer;
     private readonly IHTTPClient _httpClient;
-    private readonly IRetryHandler _retryHandler;
-    private readonly IHTTPLogger _httpLogger;
+    private readonly IRetryHandler? _retryHandler;
+    private readonly IHTTPLogger? _httpLogger;
 
     public APIConnector(Uri baseAddress, IAuthenticator authenticator) :
       this(baseAddress, authenticator, new NewtonsoftJSONSerializer(), new NetHttpClient(), null, null)
     { }
     public APIConnector(
       Uri baseAddress,
-      IAuthenticator authenticator,
+      IAuthenticator? authenticator,
       IJSONSerializer jsonSerializer,
       IHTTPClient httpClient,
-      IRetryHandler retryHandler,
-      IHTTPLogger httpLogger)
+      IRetryHandler? retryHandler,
+      IHTTPLogger? httpLogger)
     {
       _baseAddress = baseAddress;
       _authenticator = authenticator;
@@ -41,21 +41,21 @@ namespace SpotifyAPI.Web.Http
       return SendAPIRequest<T>(uri, HttpMethod.Delete);
     }
 
-    public Task<T> Delete<T>(Uri uri, IDictionary<string, string> parameters)
+    public Task<T> Delete<T>(Uri uri, IDictionary<string, string>? parameters)
     {
       Ensure.ArgumentNotNull(uri, nameof(uri));
 
       return SendAPIRequest<T>(uri, HttpMethod.Delete, parameters);
     }
 
-    public Task<T> Delete<T>(Uri uri, IDictionary<string, string> parameters, object body)
+    public Task<T> Delete<T>(Uri uri, IDictionary<string, string>? parameters, object? body)
     {
       Ensure.ArgumentNotNull(uri, nameof(uri));
 
       return SendAPIRequest<T>(uri, HttpMethod.Delete, parameters, body);
     }
 
-    public async Task<HttpStatusCode> Delete(Uri uri, IDictionary<string, string> parameters, object body)
+    public async Task<HttpStatusCode> Delete(Uri uri, IDictionary<string, string>? parameters, object? body)
     {
       Ensure.ArgumentNotNull(uri, nameof(uri));
 
@@ -70,14 +70,14 @@ namespace SpotifyAPI.Web.Http
       return SendAPIRequest<T>(uri, HttpMethod.Get);
     }
 
-    public Task<T> Get<T>(Uri uri, IDictionary<string, string> parameters)
+    public Task<T> Get<T>(Uri uri, IDictionary<string, string>? parameters)
     {
       Ensure.ArgumentNotNull(uri, nameof(uri));
 
       return SendAPIRequest<T>(uri, HttpMethod.Get, parameters);
     }
 
-    public async Task<HttpStatusCode> Get(Uri uri, IDictionary<string, string> parameters, object body)
+    public async Task<HttpStatusCode> Get(Uri uri, IDictionary<string, string>? parameters, object? body)
     {
       Ensure.ArgumentNotNull(uri, nameof(uri));
 
@@ -92,28 +92,28 @@ namespace SpotifyAPI.Web.Http
       return SendAPIRequest<T>(uri, HttpMethod.Post);
     }
 
-    public Task<T> Post<T>(Uri uri, IDictionary<string, string> parameters)
+    public Task<T> Post<T>(Uri uri, IDictionary<string, string>? parameters)
     {
       Ensure.ArgumentNotNull(uri, nameof(uri));
 
       return SendAPIRequest<T>(uri, HttpMethod.Post, parameters);
     }
 
-    public Task<T> Post<T>(Uri uri, IDictionary<string, string> parameters, object body)
+    public Task<T> Post<T>(Uri uri, IDictionary<string, string>? parameters, object? body)
     {
       Ensure.ArgumentNotNull(uri, nameof(uri));
 
       return SendAPIRequest<T>(uri, HttpMethod.Post, parameters, body);
     }
 
-    public Task<T> Post<T>(Uri uri, IDictionary<string, string> parameters, object body, Dictionary<string, string> headers)
+    public Task<T> Post<T>(Uri uri, IDictionary<string, string>? parameters, object? body, Dictionary<string, string>? headers)
     {
       Ensure.ArgumentNotNull(uri, nameof(uri));
 
       return SendAPIRequest<T>(uri, HttpMethod.Post, parameters, body, headers);
     }
 
-    public async Task<HttpStatusCode> Post(Uri uri, IDictionary<string, string> parameters, object body)
+    public async Task<HttpStatusCode> Post(Uri uri, IDictionary<string, string>? parameters, object? body)
     {
       Ensure.ArgumentNotNull(uri, nameof(uri));
 
@@ -128,21 +128,21 @@ namespace SpotifyAPI.Web.Http
       return SendAPIRequest<T>(uri, HttpMethod.Put);
     }
 
-    public Task<T> Put<T>(Uri uri, IDictionary<string, string> parameters)
+    public Task<T> Put<T>(Uri uri, IDictionary<string, string>? parameters)
     {
       Ensure.ArgumentNotNull(uri, nameof(uri));
 
       return SendAPIRequest<T>(uri, HttpMethod.Put, parameters);
     }
 
-    public Task<T> Put<T>(Uri uri, IDictionary<string, string> parameters, object body)
+    public Task<T> Put<T>(Uri uri, IDictionary<string, string>? parameters, object? body)
     {
       Ensure.ArgumentNotNull(uri, nameof(uri));
 
       return SendAPIRequest<T>(uri, HttpMethod.Put, parameters, body);
     }
 
-    public async Task<HttpStatusCode> Put(Uri uri, IDictionary<string, string> parameters, object body)
+    public async Task<HttpStatusCode> Put(Uri uri, IDictionary<string, string>? parameters, object? body)
     {
       Ensure.ArgumentNotNull(uri, nameof(uri));
 
@@ -150,7 +150,7 @@ namespace SpotifyAPI.Web.Http
       return response.StatusCode;
     }
 
-    public async Task<HttpStatusCode> PutRaw(Uri uri, IDictionary<string, string> parameters, object body)
+    public async Task<HttpStatusCode> PutRaw(Uri uri, IDictionary<string, string>? parameters, object? body)
     {
       Ensure.ArgumentNotNull(uri, nameof(uri));
 
@@ -166,19 +166,21 @@ namespace SpotifyAPI.Web.Http
     private IRequest CreateRequest(
         Uri uri,
         HttpMethod method,
-        IDictionary<string, string> parameters,
-        object body,
-        IDictionary<string, string> headers
+        IDictionary<string, string>? parameters,
+        object? body,
+        IDictionary<string, string>? headers
       )
     {
       Ensure.ArgumentNotNull(uri, nameof(uri));
       Ensure.ArgumentNotNull(method, nameof(method));
 
-      return new Request(headers ?? new Dictionary<string, string>(), parameters ?? new Dictionary<string, string>())
+      return new Request(
+        _baseAddress,
+        uri,
+        method,
+        headers ?? new Dictionary<string, string>(),
+        parameters ?? new Dictionary<string, string>())
       {
-        BaseAddress = _baseAddress,
-        Endpoint = uri,
-        Method = method,
         Body = body
       };
     }
@@ -222,16 +224,16 @@ namespace SpotifyAPI.Web.Http
         || request.Endpoint.AbsoluteUri.Contains("https://api.spotify.com", StringComparison.InvariantCulture))
 #endif
       {
-        await _authenticator.Apply(request, this).ConfigureAwait(false);
+        await _authenticator!.Apply(request, this).ConfigureAwait(false);
       }
     }
 
     public Task<IResponse> SendRawRequest(
         Uri uri,
         HttpMethod method,
-        IDictionary<string, string> parameters = null,
-        object body = null,
-        IDictionary<string, string> headers = null
+        IDictionary<string, string>? parameters = null,
+        object? body = null,
+        IDictionary<string, string>? headers = null
       )
     {
       var request = CreateRequest(uri, method, parameters, body, headers);
@@ -241,9 +243,9 @@ namespace SpotifyAPI.Web.Http
     public async Task<T> SendAPIRequest<T>(
         Uri uri,
         HttpMethod method,
-        IDictionary<string, string> parameters = null,
-        object body = null,
-        IDictionary<string, string> headers = null
+        IDictionary<string, string>? parameters = null,
+        object? body = null,
+        IDictionary<string, string>? headers = null
       )
     {
       var request = CreateRequest(uri, method, parameters, body, headers);
@@ -254,9 +256,9 @@ namespace SpotifyAPI.Web.Http
     public async Task<IResponse> SendAPIRequestDetailed(
         Uri uri,
         HttpMethod method,
-        IDictionary<string, string> parameters = null,
-        object body = null,
-        IDictionary<string, string> headers = null
+        IDictionary<string, string>? parameters = null,
+        object? body = null,
+        IDictionary<string, string>? headers = null
       )
     {
       var request = CreateRequest(uri, method, parameters, body, headers);
diff --git a/SpotifyAPI.Web/Http/Authenticators/AuthorizationCodeAuthenticator.cs b/SpotifyAPI.Web/Http/Authenticators/AuthorizationCodeAuthenticator.cs
index 77795962..e4059ebd 100644
--- a/SpotifyAPI.Web/Http/Authenticators/AuthorizationCodeAuthenticator.cs
+++ b/SpotifyAPI.Web/Http/Authenticators/AuthorizationCodeAuthenticator.cs
@@ -9,7 +9,7 @@ namespace SpotifyAPI.Web.Http
   /// </summary>
   public class AuthorizationCodeAuthenticator : IAuthenticator
   {
-    public event EventHandler<AuthorizationCodeTokenResponse> TokenRefreshed;
+    public event EventHandler<AuthorizationCodeTokenResponse>? TokenRefreshed;
 
     /// <summary>
     ///   Initiate a new instance. The token will be refreshed once it expires.
diff --git a/SpotifyAPI.Web/Http/Authenticators/CredentialsAuthenticator.cs b/SpotifyAPI.Web/Http/Authenticators/CredentialsAuthenticator.cs
index d343e6e4..e78e4149 100644
--- a/SpotifyAPI.Web/Http/Authenticators/CredentialsAuthenticator.cs
+++ b/SpotifyAPI.Web/Http/Authenticators/CredentialsAuthenticator.cs
@@ -8,7 +8,7 @@ namespace SpotifyAPI.Web.Http
   /// </summary>
   public class CredentialsAuthenticator : IAuthenticator
   {
-    private CredentialsTokenResponse _token;
+    private CredentialsTokenResponse? _token;
 
     /// <summary>
     ///   Initiate a new instance. The first token will be fetched when the first API call occurs
diff --git a/SpotifyAPI.Web/Http/Interfaces/IAPIConnector.cs b/SpotifyAPI.Web/Http/Interfaces/IAPIConnector.cs
index 8182b372..7f193a3a 100644
--- a/SpotifyAPI.Web/Http/Interfaces/IAPIConnector.cs
+++ b/SpotifyAPI.Web/Http/Interfaces/IAPIConnector.cs
@@ -17,32 +17,32 @@ namespace SpotifyAPI.Web.Http
     [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1716")]
     Task<T> Get<T>(Uri uri);
     [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1716")]
-    Task<T> Get<T>(Uri uri, IDictionary<string, string> parameters);
+    Task<T> Get<T>(Uri uri, IDictionary<string, string>? parameters);
     [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1716")]
-    Task<HttpStatusCode> Get(Uri uri, IDictionary<string, string> parameters, object body);
+    Task<HttpStatusCode> Get(Uri uri, IDictionary<string, string>? parameters, object? body);
 
     Task<T> Post<T>(Uri uri);
-    Task<T> Post<T>(Uri uri, IDictionary<string, string> parameters);
-    Task<T> Post<T>(Uri uri, IDictionary<string, string> parameters, object body);
-    Task<T> Post<T>(Uri uri, IDictionary<string, string> parameters, object body, Dictionary<string, string> headers);
-    Task<HttpStatusCode> Post(Uri uri, IDictionary<string, string> parameters, object body);
+    Task<T> Post<T>(Uri uri, IDictionary<string, string>? parameters);
+    Task<T> Post<T>(Uri uri, IDictionary<string, string>? parameters, object? body);
+    Task<T> Post<T>(Uri uri, IDictionary<string, string>? parameters, object? body, Dictionary<string, string>? headers);
+    Task<HttpStatusCode> Post(Uri uri, IDictionary<string, string>? parameters, object? body);
 
     Task<T> Put<T>(Uri uri);
-    Task<T> Put<T>(Uri uri, IDictionary<string, string> parameters);
-    Task<T> Put<T>(Uri uri, IDictionary<string, string> parameters, object body);
-    Task<HttpStatusCode> Put(Uri uri, IDictionary<string, string> parameters, object body);
-    Task<HttpStatusCode> PutRaw(Uri uri, IDictionary<string, string> parameters, object body);
+    Task<T> Put<T>(Uri uri, IDictionary<string, string>? parameters);
+    Task<T> Put<T>(Uri uri, IDictionary<string, string>? parameters, object? body);
+    Task<HttpStatusCode> Put(Uri uri, IDictionary<string, string>? parameters, object? body);
+    Task<HttpStatusCode> PutRaw(Uri uri, IDictionary<string, string>? parameters, object? body);
 
     Task<T> Delete<T>(Uri uri);
-    Task<T> Delete<T>(Uri uri, IDictionary<string, string> parameters);
-    Task<T> Delete<T>(Uri uri, IDictionary<string, string> parameters, object body);
-    Task<HttpStatusCode> Delete(Uri uri, IDictionary<string, string> parameters, object body);
+    Task<T> Delete<T>(Uri uri, IDictionary<string, string>? parameters);
+    Task<T> Delete<T>(Uri uri, IDictionary<string, string>? parameters, object? body);
+    Task<HttpStatusCode> Delete(Uri uri, IDictionary<string, string>? parameters, object? body);
 
     Task<T> SendAPIRequest<T>(
       Uri uri, HttpMethod method,
-      IDictionary<string, string> parameters = null,
-      object body = null,
-      IDictionary<string, string> headers = null);
+      IDictionary<string, string>? parameters = null,
+      object? body = null,
+      IDictionary<string, string>? headers = null);
 
     void SetRequestTimeout(TimeSpan timeout);
   }
diff --git a/SpotifyAPI.Web/Http/Interfaces/IProxyConfig.cs b/SpotifyAPI.Web/Http/Interfaces/IProxyConfig.cs
index 1076feb3..7a6f281b 100644
--- a/SpotifyAPI.Web/Http/Interfaces/IProxyConfig.cs
+++ b/SpotifyAPI.Web/Http/Interfaces/IProxyConfig.cs
@@ -4,8 +4,8 @@ namespace SpotifyAPI.Web
   {
     string Host { get; }
     int Port { get; }
-    string User { get; }
-    string Password { get; }
+    string? User { get; }
+    string? Password { get; }
     bool SkipSSLCheck { get; }
     /// <summary>
     ///   Whether to bypass the proxy server for local addresses.
diff --git a/SpotifyAPI.Web/Http/Interfaces/IRequest.cs b/SpotifyAPI.Web/Http/Interfaces/IRequest.cs
index 9a6c0db3..c5d91532 100644
--- a/SpotifyAPI.Web/Http/Interfaces/IRequest.cs
+++ b/SpotifyAPI.Web/Http/Interfaces/IRequest.cs
@@ -16,6 +16,6 @@ namespace SpotifyAPI.Web.Http
 
     HttpMethod Method { get; }
 
-    object Body { get; set; }
+    object? Body { get; set; }
   }
 }
diff --git a/SpotifyAPI.Web/Http/Interfaces/IResponse.cs b/SpotifyAPI.Web/Http/Interfaces/IResponse.cs
index 09b54fab..b4ace428 100644
--- a/SpotifyAPI.Web/Http/Interfaces/IResponse.cs
+++ b/SpotifyAPI.Web/Http/Interfaces/IResponse.cs
@@ -5,12 +5,12 @@ namespace SpotifyAPI.Web.Http
 {
   public interface IResponse
   {
-    object Body { get; }
+    object? Body { get; }
 
     IReadOnlyDictionary<string, string> Headers { get; }
 
     HttpStatusCode StatusCode { get; }
 
-    string ContentType { get; }
+    string? ContentType { get; }
   }
 }
diff --git a/SpotifyAPI.Web/Http/NetHttpClient.cs b/SpotifyAPI.Web/Http/NetHttpClient.cs
index f4191f50..26b4435b 100644
--- a/SpotifyAPI.Web/Http/NetHttpClient.cs
+++ b/SpotifyAPI.Web/Http/NetHttpClient.cs
@@ -10,7 +10,7 @@ namespace SpotifyAPI.Web.Http
 {
   public class NetHttpClient : IHTTPClient
   {
-    private readonly HttpMessageHandler _httpMessageHandler;
+    private readonly HttpMessageHandler? _httpMessageHandler;
     private readonly HttpClient _httpClient;
 
     public NetHttpClient()
diff --git a/SpotifyAPI.Web/Http/NewtonsoftJSONSerializer.cs b/SpotifyAPI.Web/Http/NewtonsoftJSONSerializer.cs
index ff6d45c5..2db938ab 100644
--- a/SpotifyAPI.Web/Http/NewtonsoftJSONSerializer.cs
+++ b/SpotifyAPI.Web/Http/NewtonsoftJSONSerializer.cs
@@ -31,10 +31,13 @@ namespace SpotifyAPI.Web.Http
     {
       Ensure.ArgumentNotNull(response, nameof(response));
 
-      if (response.ContentType?.Equals("application/json", StringComparison.Ordinal) is true || response.ContentType == null)
+      if (
+        (
+          response.ContentType?.Equals("application/json", StringComparison.Ordinal) is true || response.ContentType == null
+        ))
       {
-        var body = JsonConvert.DeserializeObject<T>(response.Body as string, _serializerSettings);
-        return new APIResponse<T>(response, body);
+        var body = JsonConvert.DeserializeObject<T>(response.Body as string ?? "", _serializerSettings);
+        return new APIResponse<T>(response, body!);
       }
       return new APIResponse<T>(response);
     }
diff --git a/SpotifyAPI.Web/Http/ProxyConfig.cs b/SpotifyAPI.Web/Http/ProxyConfig.cs
index 5d08e9ee..0392c4d7 100644
--- a/SpotifyAPI.Web/Http/ProxyConfig.cs
+++ b/SpotifyAPI.Web/Http/ProxyConfig.cs
@@ -12,8 +12,8 @@ namespace SpotifyAPI.Web
 
     public string Host { get; }
     public int Port { get; }
-    public string User { get; set; }
-    public string Password { get; set; }
+    public string? User { get; set; }
+    public string? Password { get; set; }
     public bool BypassProxyOnLocal { get; set; }
     public bool SkipSSLCheck { get; set; }
   }
diff --git a/SpotifyAPI.Web/Http/Request.cs b/SpotifyAPI.Web/Http/Request.cs
index 18748f8e..42dd4cce 100644
--- a/SpotifyAPI.Web/Http/Request.cs
+++ b/SpotifyAPI.Web/Http/Request.cs
@@ -6,22 +6,36 @@ namespace SpotifyAPI.Web.Http
 {
   public class Request : IRequest
   {
-    public Request()
+    public Request(Uri baseAddress, Uri endpoint, HttpMethod method)
     {
       Headers = new Dictionary<string, string>();
       Parameters = new Dictionary<string, string>();
+      BaseAddress = baseAddress;
+      Endpoint = endpoint;
+      Method = method;
     }
 
-    public Request(IDictionary<string, string> headers)
+    public Request(Uri baseAddress, Uri endpoint, HttpMethod method, IDictionary<string, string> headers)
     {
       Headers = headers;
       Parameters = new Dictionary<string, string>();
+      BaseAddress = baseAddress;
+      Endpoint = endpoint;
+      Method = method;
     }
 
-    public Request(IDictionary<string, string> headers, IDictionary<string, string> parameters)
+    public Request(
+      Uri baseAddress,
+      Uri endpoint,
+      HttpMethod method,
+      IDictionary<string, string> headers,
+      IDictionary<string, string> parameters)
     {
       Headers = headers;
       Parameters = parameters;
+      BaseAddress = baseAddress;
+      Endpoint = endpoint;
+      Method = method;
     }
 
     public Uri BaseAddress { get; set; }
@@ -34,6 +48,6 @@ namespace SpotifyAPI.Web.Http
 
     public HttpMethod Method { get; set; }
 
-    public object Body { get; set; }
+    public object? Body { get; set; }
   }
 }
diff --git a/SpotifyAPI.Web/Http/Response.cs b/SpotifyAPI.Web/Http/Response.cs
index 93d3ed74..de16744f 100644
--- a/SpotifyAPI.Web/Http/Response.cs
+++ b/SpotifyAPI.Web/Http/Response.cs
@@ -14,12 +14,12 @@ namespace SpotifyAPI.Web.Http
       Headers = new ReadOnlyDictionary<string, string>(headers);
     }
 
-    public object Body { get; set; }
+    public object? Body { get; set; }
 
     public IReadOnlyDictionary<string, string> Headers { get; set; }
 
     public HttpStatusCode StatusCode { get; set; }
 
-    public string ContentType { get; set; }
+    public string? ContentType { get; set; }
   }
 }
diff --git a/SpotifyAPI.Web/Http/SimpleHTTPLogger.cs b/SpotifyAPI.Web/Http/SimpleHTTPLogger.cs
index 8ec57608..d2487821 100644
--- a/SpotifyAPI.Web/Http/SimpleHTTPLogger.cs
+++ b/SpotifyAPI.Web/Http/SimpleHTTPLogger.cs
@@ -12,7 +12,7 @@ namespace SpotifyAPI.Web.Http
     {
       Ensure.ArgumentNotNull(request, nameof(request));
 
-      string parameters = null;
+      string? parameters = null;
       if (request.Parameters != null)
       {
         parameters = string.Join(",", request.Parameters?.Select(kv => kv.Key + "=" + kv.Value).ToArray());
@@ -26,9 +26,9 @@ namespace SpotifyAPI.Web.Http
     {
       Ensure.ArgumentNotNull(response, nameof(response));
 #if NETSTANDARD2_0
-      string body = response.Body?.ToString().Replace("\n", "");
+      string? body = response.Body?.ToString().Replace("\n", "");
 #else
-      string body = response.Body?.ToString().Replace("\n", "", StringComparison.InvariantCulture);
+      string? body = response.Body?.ToString().Replace("\n", "", StringComparison.InvariantCulture);
 #endif
 
       body = body?.Substring(0, Math.Min(50, body?.Length ?? 0));
diff --git a/SpotifyAPI.Web/Models/Converters/PlaylistElementConverter.cs b/SpotifyAPI.Web/Models/Converters/PlaylistElementConverter.cs
index 1505bb05..bec5e263 100644
--- a/SpotifyAPI.Web/Models/Converters/PlaylistElementConverter.cs
+++ b/SpotifyAPI.Web/Models/Converters/PlaylistElementConverter.cs
@@ -8,8 +8,8 @@ namespace SpotifyAPI.Web
   {
     public override bool CanConvert(Type objectType) => true;
 
-    public override object ReadJson(JsonReader reader, Type objectType,
-        object existingValue, JsonSerializer serializer)
+    public override object? ReadJson(JsonReader reader, Type objectType,
+        object? existingValue, JsonSerializer serializer)
     {
       Ensure.ArgumentNotNull(serializer, nameof(serializer));
 
@@ -19,7 +19,7 @@ namespace SpotifyAPI.Web
         return null;
       }
 
-      var type = token["type"].Value<string>();
+      var type = token["type"]?.Value<string>();
       if (type == "track")
       {
         var obj = new FullTrack();
@@ -38,10 +38,10 @@ namespace SpotifyAPI.Web
       }
     }
 
-    public override void WriteJson(JsonWriter writer, object value,
-        JsonSerializer serializer)
+    public override void WriteJson(JsonWriter writer, object? value, JsonSerializer serializer)
     {
       throw new NotSupportedException();
     }
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Request/AlbumRequest.cs b/SpotifyAPI.Web/Models/Request/AlbumRequest.cs
index 8633b9ab..0154d447 100644
--- a/SpotifyAPI.Web/Models/Request/AlbumRequest.cs
+++ b/SpotifyAPI.Web/Models/Request/AlbumRequest.cs
@@ -3,6 +3,6 @@ namespace SpotifyAPI.Web
   public class AlbumRequest : RequestParams
   {
     [QueryParam("market")]
-    public string Market { get; set; }
+    public string? Market { get; set; }
   }
 }
diff --git a/SpotifyAPI.Web/Models/Request/AlbumTracksRequest.cs b/SpotifyAPI.Web/Models/Request/AlbumTracksRequest.cs
index c02119ae..6e3d443a 100644
--- a/SpotifyAPI.Web/Models/Request/AlbumTracksRequest.cs
+++ b/SpotifyAPI.Web/Models/Request/AlbumTracksRequest.cs
@@ -3,7 +3,7 @@ namespace SpotifyAPI.Web
   public class AlbumTracksRequest : RequestParams
   {
     [QueryParam("market")]
-    public string Market { get; set; }
+    public string? Market { get; set; }
 
     [QueryParam("limit")]
     public int? Limit { get; set; }
@@ -12,3 +12,4 @@ namespace SpotifyAPI.Web
     public int? Offset { get; set; }
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Request/AlbumsRequest.cs b/SpotifyAPI.Web/Models/Request/AlbumsRequest.cs
index 4fb40cb4..f36f5403 100644
--- a/SpotifyAPI.Web/Models/Request/AlbumsRequest.cs
+++ b/SpotifyAPI.Web/Models/Request/AlbumsRequest.cs
@@ -15,6 +15,7 @@ namespace SpotifyAPI.Web
     public IList<string> Ids { get; }
 
     [QueryParam("market")]
-    public string Market { get; set; }
+    public string? Market { get; set; }
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Request/ArtistsAlbumsRequest.cs b/SpotifyAPI.Web/Models/Request/ArtistsAlbumsRequest.cs
index 618db6fa..2ae8a268 100644
--- a/SpotifyAPI.Web/Models/Request/ArtistsAlbumsRequest.cs
+++ b/SpotifyAPI.Web/Models/Request/ArtistsAlbumsRequest.cs
@@ -8,7 +8,7 @@ namespace SpotifyAPI.Web
     public IncludeGroups? IncludeGroupsParam { get; set; }
 
     [QueryParam("market")]
-    public string Market { get; set; }
+    public string? Market { get; set; }
 
     [QueryParam("limit")]
     public int? Limit { get; set; }
@@ -34,3 +34,4 @@ namespace SpotifyAPI.Web
     }
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Request/ArtistsRequest.cs b/SpotifyAPI.Web/Models/Request/ArtistsRequest.cs
index 81fdee4c..7342f766 100644
--- a/SpotifyAPI.Web/Models/Request/ArtistsRequest.cs
+++ b/SpotifyAPI.Web/Models/Request/ArtistsRequest.cs
@@ -15,3 +15,4 @@ namespace SpotifyAPI.Web
     public IList<string> Ids { get; }
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Request/ArtistsTopTracksRequest.cs b/SpotifyAPI.Web/Models/Request/ArtistsTopTracksRequest.cs
index d3b98cf5..9aaff456 100644
--- a/SpotifyAPI.Web/Models/Request/ArtistsTopTracksRequest.cs
+++ b/SpotifyAPI.Web/Models/Request/ArtistsTopTracksRequest.cs
@@ -13,3 +13,4 @@ namespace SpotifyAPI.Web
     public string Market { get; }
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Request/AuthorizationCodeRefreshRequest.cs b/SpotifyAPI.Web/Models/Request/AuthorizationCodeRefreshRequest.cs
index 1bb54484..c2fb6cc2 100644
--- a/SpotifyAPI.Web/Models/Request/AuthorizationCodeRefreshRequest.cs
+++ b/SpotifyAPI.Web/Models/Request/AuthorizationCodeRefreshRequest.cs
@@ -21,3 +21,4 @@ namespace SpotifyAPI.Web
     public string ClientSecret { get; }
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Request/AuthorizationCodeTokenRequest.cs b/SpotifyAPI.Web/Models/Request/AuthorizationCodeTokenRequest.cs
index e376fbda..831e4af0 100644
--- a/SpotifyAPI.Web/Models/Request/AuthorizationCodeTokenRequest.cs
+++ b/SpotifyAPI.Web/Models/Request/AuthorizationCodeTokenRequest.cs
@@ -25,3 +25,4 @@ namespace SpotifyAPI.Web
     public Uri RedirectUri { get; }
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Request/CategoriesRequest.cs b/SpotifyAPI.Web/Models/Request/CategoriesRequest.cs
index 0e0072c6..8dd92e1c 100644
--- a/SpotifyAPI.Web/Models/Request/CategoriesRequest.cs
+++ b/SpotifyAPI.Web/Models/Request/CategoriesRequest.cs
@@ -3,10 +3,10 @@ namespace SpotifyAPI.Web
   public class CategoriesRequest : RequestParams
   {
     [QueryParam("country")]
-    public string Country { get; set; }
+    public string? Country { get; set; }
 
     [QueryParam("locale")]
-    public string Locale { get; set; }
+    public string? Locale { get; set; }
 
     [QueryParam("limit")]
     public int? Limit { get; set; }
@@ -15,3 +15,4 @@ namespace SpotifyAPI.Web
     public int? Offset { get; set; }
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Request/CategoryPlaylistsRequest.cs b/SpotifyAPI.Web/Models/Request/CategoryPlaylistsRequest.cs
index e7ff31f9..65ecb340 100644
--- a/SpotifyAPI.Web/Models/Request/CategoryPlaylistsRequest.cs
+++ b/SpotifyAPI.Web/Models/Request/CategoryPlaylistsRequest.cs
@@ -3,7 +3,7 @@ namespace SpotifyAPI.Web
   public class CategoriesPlaylistsRequest : RequestParams
   {
     [QueryParam("country")]
-    public string Country { get; set; }
+    public string? Country { get; set; }
 
     [QueryParam("limit")]
     public int? Limit { get; set; }
@@ -12,3 +12,4 @@ namespace SpotifyAPI.Web
     public int? Offset { get; set; }
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Request/CategoryRequest.cs b/SpotifyAPI.Web/Models/Request/CategoryRequest.cs
index 6fd31513..306a4976 100644
--- a/SpotifyAPI.Web/Models/Request/CategoryRequest.cs
+++ b/SpotifyAPI.Web/Models/Request/CategoryRequest.cs
@@ -3,9 +3,10 @@ namespace SpotifyAPI.Web
   public class CategoryRequest : RequestParams
   {
     [QueryParam("country")]
-    public string Country { get; set; }
+    public string? Country { get; set; }
 
     [QueryParam("locale")]
-    public string Locale { get; set; }
+    public string? Locale { get; set; }
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Request/ClientCredentialsRequest.cs b/SpotifyAPI.Web/Models/Request/ClientCredentialsRequest.cs
index 00bcd31d..b4a12a3a 100644
--- a/SpotifyAPI.Web/Models/Request/ClientCredentialsRequest.cs
+++ b/SpotifyAPI.Web/Models/Request/ClientCredentialsRequest.cs
@@ -17,3 +17,4 @@ namespace SpotifyAPI.Web
     public string ClientSecret { get; }
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Request/EpisodeRequest.cs b/SpotifyAPI.Web/Models/Request/EpisodeRequest.cs
index c4c178e4..28e034ee 100644
--- a/SpotifyAPI.Web/Models/Request/EpisodeRequest.cs
+++ b/SpotifyAPI.Web/Models/Request/EpisodeRequest.cs
@@ -3,6 +3,7 @@ namespace SpotifyAPI.Web
   public class EpisodeRequest : RequestParams
   {
     [QueryParam("market")]
-    public string Market { get; set; }
+    public string? Market { get; set; }
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Request/EpisodesRequest.cs b/SpotifyAPI.Web/Models/Request/EpisodesRequest.cs
index e58ed833..a9450b60 100644
--- a/SpotifyAPI.Web/Models/Request/EpisodesRequest.cs
+++ b/SpotifyAPI.Web/Models/Request/EpisodesRequest.cs
@@ -12,9 +12,10 @@ namespace SpotifyAPI.Web
     }
 
     [QueryParam("ids")]
-    public IList<string> Ids { get; set; }
+    public IList<string> Ids { get; }
 
     [QueryParam("market")]
-    public string Market { get; set; }
+    public string? Market { get; set; }
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Request/FeaturedPlaylistsRequest.cs b/SpotifyAPI.Web/Models/Request/FeaturedPlaylistsRequest.cs
index f97c384a..1cdb1fa7 100644
--- a/SpotifyAPI.Web/Models/Request/FeaturedPlaylistsRequest.cs
+++ b/SpotifyAPI.Web/Models/Request/FeaturedPlaylistsRequest.cs
@@ -5,19 +5,24 @@ namespace SpotifyAPI.Web
   public class FeaturedPlaylistsRequest : RequestParams
   {
     [QueryParam("country")]
-    public string Country { get; set; }
+    public string? Country { get; set; }
+
     [QueryParam("locale")]
-    public string Locale { get; set; }
+    public string? Locale { get; set; }
+
     [QueryParam("limit")]
     public int? Limit { get; set; }
+
     [QueryParam("offset")]
     public int? Offset { get; set; }
+
     public DateTime? Timestamp { get; set; }
 
     [QueryParam("timestamp")]
-    protected string TimestampFormatted
+    protected string? TimestampFormatted
     {
       get => Timestamp?.ToString("o", CultureInfo.InvariantCulture);
     }
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Request/FollowCheckCurrentUserRequest.cs b/SpotifyAPI.Web/Models/Request/FollowCheckCurrentUserRequest.cs
index d787394d..81023c02 100644
--- a/SpotifyAPI.Web/Models/Request/FollowCheckCurrentUserRequest.cs
+++ b/SpotifyAPI.Web/Models/Request/FollowCheckCurrentUserRequest.cs
@@ -28,3 +28,4 @@ namespace SpotifyAPI.Web
     }
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Request/FollowCheckPlaylistRequest.cs b/SpotifyAPI.Web/Models/Request/FollowCheckPlaylistRequest.cs
index f4dc5eb1..2110b2ca 100644
--- a/SpotifyAPI.Web/Models/Request/FollowCheckPlaylistRequest.cs
+++ b/SpotifyAPI.Web/Models/Request/FollowCheckPlaylistRequest.cs
@@ -15,3 +15,4 @@ namespace SpotifyAPI.Web
     public IList<string> Ids { get; }
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Request/FollowGetCurrentUserRequest.cs b/SpotifyAPI.Web/Models/Request/FollowGetCurrentUserRequest.cs
index acb4f82b..d70eafbe 100644
--- a/SpotifyAPI.Web/Models/Request/FollowGetCurrentUserRequest.cs
+++ b/SpotifyAPI.Web/Models/Request/FollowGetCurrentUserRequest.cs
@@ -14,7 +14,7 @@ namespace SpotifyAPI.Web
     public int? Limit { get; set; }
 
     [QueryParam("after")]
-    public string After { get; set; }
+    public string? After { get; set; }
 
     public enum Type
     {
@@ -23,3 +23,4 @@ namespace SpotifyAPI.Web
     }
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Request/FollowPlaylistRequest.cs b/SpotifyAPI.Web/Models/Request/FollowPlaylistRequest.cs
index 72a45951..4e6cf2b1 100644
--- a/SpotifyAPI.Web/Models/Request/FollowPlaylistRequest.cs
+++ b/SpotifyAPI.Web/Models/Request/FollowPlaylistRequest.cs
@@ -6,3 +6,4 @@ namespace SpotifyAPI.Web
     public bool? Public { get; set; }
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Request/FollowRequest.cs b/SpotifyAPI.Web/Models/Request/FollowRequest.cs
index 07bc41c2..8c2e0285 100644
--- a/SpotifyAPI.Web/Models/Request/FollowRequest.cs
+++ b/SpotifyAPI.Web/Models/Request/FollowRequest.cs
@@ -28,3 +28,4 @@ namespace SpotifyAPI.Web
     }
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Request/LibraryAlbumsRequest.cs b/SpotifyAPI.Web/Models/Request/LibraryAlbumsRequest.cs
index 0aaba0bd..3e091d99 100644
--- a/SpotifyAPI.Web/Models/Request/LibraryAlbumsRequest.cs
+++ b/SpotifyAPI.Web/Models/Request/LibraryAlbumsRequest.cs
@@ -9,6 +9,7 @@ namespace SpotifyAPI.Web
     public int? Offset { get; set; }
 
     [QueryParam("market")]
-    public string Market { get; set; }
+    public string? Market { get; set; }
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Request/LibraryCheckAlbumsRequest.cs b/SpotifyAPI.Web/Models/Request/LibraryCheckAlbumsRequest.cs
index a7b25c58..18aef33f 100644
--- a/SpotifyAPI.Web/Models/Request/LibraryCheckAlbumsRequest.cs
+++ b/SpotifyAPI.Web/Models/Request/LibraryCheckAlbumsRequest.cs
@@ -16,3 +16,4 @@ namespace SpotifyAPI.Web
     public IList<string> Ids { get; }
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Request/LibraryCheckShowsRequest.cs b/SpotifyAPI.Web/Models/Request/LibraryCheckShowsRequest.cs
index 66ba2aab..dd5e0cb4 100644
--- a/SpotifyAPI.Web/Models/Request/LibraryCheckShowsRequest.cs
+++ b/SpotifyAPI.Web/Models/Request/LibraryCheckShowsRequest.cs
@@ -15,3 +15,4 @@ namespace SpotifyAPI.Web
     public IList<string> Ids { get; }
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Request/LibraryCheckTracksRequest.cs b/SpotifyAPI.Web/Models/Request/LibraryCheckTracksRequest.cs
index ee2d291f..d1c21901 100644
--- a/SpotifyAPI.Web/Models/Request/LibraryCheckTracksRequest.cs
+++ b/SpotifyAPI.Web/Models/Request/LibraryCheckTracksRequest.cs
@@ -15,3 +15,4 @@ namespace SpotifyAPI.Web
     public IList<string> Ids { get; }
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Request/LibraryRemoveAlbumsRequest.cs b/SpotifyAPI.Web/Models/Request/LibraryRemoveAlbumsRequest.cs
index fc69474a..04cfb2a1 100644
--- a/SpotifyAPI.Web/Models/Request/LibraryRemoveAlbumsRequest.cs
+++ b/SpotifyAPI.Web/Models/Request/LibraryRemoveAlbumsRequest.cs
@@ -15,3 +15,4 @@ namespace SpotifyAPI.Web
     public IList<string> Ids { get; }
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Request/LibraryRemoveShowsRequest.cs b/SpotifyAPI.Web/Models/Request/LibraryRemoveShowsRequest.cs
index ac2fd390..be60abb4 100644
--- a/SpotifyAPI.Web/Models/Request/LibraryRemoveShowsRequest.cs
+++ b/SpotifyAPI.Web/Models/Request/LibraryRemoveShowsRequest.cs
@@ -15,3 +15,4 @@ namespace SpotifyAPI.Web
     public IList<string> Ids { get; }
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Request/LibraryRemoveTracksRequest.cs b/SpotifyAPI.Web/Models/Request/LibraryRemoveTracksRequest.cs
index 661922d4..c2c044c7 100644
--- a/SpotifyAPI.Web/Models/Request/LibraryRemoveTracksRequest.cs
+++ b/SpotifyAPI.Web/Models/Request/LibraryRemoveTracksRequest.cs
@@ -15,3 +15,4 @@ namespace SpotifyAPI.Web
     public IList<string> Ids { get; }
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Request/LibrarySaveAlbumsRequest.cs b/SpotifyAPI.Web/Models/Request/LibrarySaveAlbumsRequest.cs
index ea442c72..be999422 100644
--- a/SpotifyAPI.Web/Models/Request/LibrarySaveAlbumsRequest.cs
+++ b/SpotifyAPI.Web/Models/Request/LibrarySaveAlbumsRequest.cs
@@ -15,3 +15,4 @@ namespace SpotifyAPI.Web
     public IList<string> Ids { get; }
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Request/LibrarySaveShowsRequest.cs b/SpotifyAPI.Web/Models/Request/LibrarySaveShowsRequest.cs
index 84adb029..0f19c64d 100644
--- a/SpotifyAPI.Web/Models/Request/LibrarySaveShowsRequest.cs
+++ b/SpotifyAPI.Web/Models/Request/LibrarySaveShowsRequest.cs
@@ -15,3 +15,4 @@ namespace SpotifyAPI.Web
     public IList<string> Ids { get; }
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Request/LibrarySaveTracksRequest.cs b/SpotifyAPI.Web/Models/Request/LibrarySaveTracksRequest.cs
index 93d3842b..54589e61 100644
--- a/SpotifyAPI.Web/Models/Request/LibrarySaveTracksRequest.cs
+++ b/SpotifyAPI.Web/Models/Request/LibrarySaveTracksRequest.cs
@@ -15,3 +15,4 @@ namespace SpotifyAPI.Web
     public IList<string> Ids { get; }
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Request/LibraryShowsRequest.cs b/SpotifyAPI.Web/Models/Request/LibraryShowsRequest.cs
index 356ada6e..c59c309e 100644
--- a/SpotifyAPI.Web/Models/Request/LibraryShowsRequest.cs
+++ b/SpotifyAPI.Web/Models/Request/LibraryShowsRequest.cs
@@ -9,6 +9,7 @@ namespace SpotifyAPI.Web
     public int? Offset { get; set; }
 
     [QueryParam("market")]
-    public string Market { get; set; }
+    public string? Market { get; set; }
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Request/LibraryTracksRequest.cs b/SpotifyAPI.Web/Models/Request/LibraryTracksRequest.cs
index da2468f4..04016a52 100644
--- a/SpotifyAPI.Web/Models/Request/LibraryTracksRequest.cs
+++ b/SpotifyAPI.Web/Models/Request/LibraryTracksRequest.cs
@@ -9,6 +9,7 @@ namespace SpotifyAPI.Web
     public int? Offset { get; set; }
 
     [QueryParam("market")]
-    public string Market { get; set; }
+    public string? Market { get; set; }
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Request/LoginRequest.cs b/SpotifyAPI.Web/Models/Request/LoginRequest.cs
index df8454c7..4ba13fca 100644
--- a/SpotifyAPI.Web/Models/Request/LoginRequest.cs
+++ b/SpotifyAPI.Web/Models/Request/LoginRequest.cs
@@ -21,8 +21,8 @@ namespace SpotifyAPI.Web
     public Uri RedirectUri { get; }
     public ResponseType ResponseTypeParam { get; }
     public string ClientId { get; }
-    public string State { get; set; }
-    public ICollection<string> Scope { get; set; }
+    public string? State { get; set; }
+    public ICollection<string>? Scope { get; set; }
     public bool? ShowDialog { get; set; }
 
     public Uri ToUri()
@@ -54,3 +54,4 @@ namespace SpotifyAPI.Web
     }
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Request/NewReleasesRequest.cs b/SpotifyAPI.Web/Models/Request/NewReleasesRequest.cs
index dc20a39b..84cff1de 100644
--- a/SpotifyAPI.Web/Models/Request/NewReleasesRequest.cs
+++ b/SpotifyAPI.Web/Models/Request/NewReleasesRequest.cs
@@ -1,14 +1,15 @@
 namespace SpotifyAPI.Web
 {
-    public class NewReleasesRequest : RequestParams
-    {
-        [QueryParam("country")]
-        public string Country { get; set; }
+  public class NewReleasesRequest : RequestParams
+  {
+    [QueryParam("country")]
+    public string? Country { get; set; }
 
-        [QueryParam("limit")]
-        public int? Limit { get; set; }
+    [QueryParam("limit")]
+    public int? Limit { get; set; }
 
-        [QueryParam("offset")]
-        public int? Offset { get; set; }
-    }
+    [QueryParam("offset")]
+    public int? Offset { get; set; }
+  }
 }
+
diff --git a/SpotifyAPI.Web/Models/Request/PersonalizationTopRequest.cs b/SpotifyAPI.Web/Models/Request/PersonalizationTopRequest.cs
index b08987ca..2db90af8 100644
--- a/SpotifyAPI.Web/Models/Request/PersonalizationTopRequest.cs
+++ b/SpotifyAPI.Web/Models/Request/PersonalizationTopRequest.cs
@@ -24,3 +24,4 @@ namespace SpotifyAPI.Web
     }
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Request/PlayerAddToQueueRequest.cs b/SpotifyAPI.Web/Models/Request/PlayerAddToQueueRequest.cs
index 01ebcce8..fecc8aac 100644
--- a/SpotifyAPI.Web/Models/Request/PlayerAddToQueueRequest.cs
+++ b/SpotifyAPI.Web/Models/Request/PlayerAddToQueueRequest.cs
@@ -13,6 +13,7 @@ namespace SpotifyAPI.Web
     public string Uri { get; }
 
     [QueryParam("device_id")]
-    public string DeviceId { get; set; }
+    public string? DeviceId { get; set; }
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Request/PlayerCurrentPlaybackRequest.cs b/SpotifyAPI.Web/Models/Request/PlayerCurrentPlaybackRequest.cs
index a8a4c2fc..435cab06 100644
--- a/SpotifyAPI.Web/Models/Request/PlayerCurrentPlaybackRequest.cs
+++ b/SpotifyAPI.Web/Models/Request/PlayerCurrentPlaybackRequest.cs
@@ -12,7 +12,7 @@ namespace SpotifyAPI.Web
     }
 
     [QueryParam("market")]
-    public string Market { get; set; }
+    public string? Market { get; set; }
 
     /// <summary>
     ///   This is set to `"track", "episode"` by default.
@@ -32,3 +32,4 @@ namespace SpotifyAPI.Web
     }
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Request/PlayerCurrentlyPlayingRequest.cs b/SpotifyAPI.Web/Models/Request/PlayerCurrentlyPlayingRequest.cs
index 3817be50..a394ac98 100644
--- a/SpotifyAPI.Web/Models/Request/PlayerCurrentlyPlayingRequest.cs
+++ b/SpotifyAPI.Web/Models/Request/PlayerCurrentlyPlayingRequest.cs
@@ -34,3 +34,4 @@ namespace SpotifyAPI.Web
     }
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Request/PlayerPausePlaybackRequest.cs b/SpotifyAPI.Web/Models/Request/PlayerPausePlaybackRequest.cs
index 2b058a3c..6ebe42e0 100644
--- a/SpotifyAPI.Web/Models/Request/PlayerPausePlaybackRequest.cs
+++ b/SpotifyAPI.Web/Models/Request/PlayerPausePlaybackRequest.cs
@@ -3,6 +3,7 @@ namespace SpotifyAPI.Web
   public class PlayerPausePlaybackRequest : RequestParams
   {
     [QueryParam("device_id")]
-    public string DeviceId { get; set; }
+    public string? DeviceId { get; set; }
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Request/PlayerRecentlyPlayedRequest.cs b/SpotifyAPI.Web/Models/Request/PlayerRecentlyPlayedRequest.cs
index 5df75fca..32427da1 100644
--- a/SpotifyAPI.Web/Models/Request/PlayerRecentlyPlayedRequest.cs
+++ b/SpotifyAPI.Web/Models/Request/PlayerRecentlyPlayedRequest.cs
@@ -12,3 +12,4 @@ namespace SpotifyAPI.Web
     public long? Before { get; set; }
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Request/PlayerResumePlaybackRequest.cs b/SpotifyAPI.Web/Models/Request/PlayerResumePlaybackRequest.cs
index 6041ed00..eda8fa30 100644
--- a/SpotifyAPI.Web/Models/Request/PlayerResumePlaybackRequest.cs
+++ b/SpotifyAPI.Web/Models/Request/PlayerResumePlaybackRequest.cs
@@ -6,17 +6,17 @@ namespace SpotifyAPI.Web
   public class PlayerResumePlaybackRequest : RequestParams
   {
     [QueryParam("device_id")]
-    public string DeviceId { get; set; }
+    public string? DeviceId { get; set; }
 
     [BodyParam("context_uri")]
-    public string ContextUri { get; set; }
+    public string? ContextUri { get; set; }
 
     [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227")]
     [BodyParam("uris")]
-    public IList<string> Uris { get; set; }
+    public IList<string>? Uris { get; set; }
 
     [BodyParam("offset")]
-    public Offset OffsetParam { get; set; }
+    public Offset? OffsetParam { get; set; }
 
     [BodyParam("position_ms")]
     public int? PositionMs { get; set; }
@@ -24,10 +24,11 @@ namespace SpotifyAPI.Web
     public class Offset
     {
       [JsonProperty("uri", NullValueHandling = NullValueHandling.Ignore)]
-      public string Uri { get; set; }
+      public string? Uri { get; set; }
 
       [JsonProperty("position", NullValueHandling = NullValueHandling.Ignore)]
       public int? Position { get; set; }
     }
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Request/PlayerSeekToRequest.cs b/SpotifyAPI.Web/Models/Request/PlayerSeekToRequest.cs
index 439de03a..e1fa0837 100644
--- a/SpotifyAPI.Web/Models/Request/PlayerSeekToRequest.cs
+++ b/SpotifyAPI.Web/Models/Request/PlayerSeekToRequest.cs
@@ -11,6 +11,7 @@ namespace SpotifyAPI.Web
     public long PositonMs { get; }
 
     [QueryParam("device_id")]
-    public string DeviceId { get; set; }
+    public string? DeviceId { get; set; }
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Request/PlayerSetRepeatRequest.cs b/SpotifyAPI.Web/Models/Request/PlayerSetRepeatRequest.cs
index 9d780f3b..9ec23043 100644
--- a/SpotifyAPI.Web/Models/Request/PlayerSetRepeatRequest.cs
+++ b/SpotifyAPI.Web/Models/Request/PlayerSetRepeatRequest.cs
@@ -10,7 +10,7 @@ namespace SpotifyAPI.Web
     }
 
     [QueryParam("device_id")]
-    public string DeviceId { get; set; }
+    public string? DeviceId { get; set; }
 
     [QueryParam("state")]
     public State StateParam { get; }
@@ -28,3 +28,4 @@ namespace SpotifyAPI.Web
     }
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Request/PlayerShuffleRequest.cs b/SpotifyAPI.Web/Models/Request/PlayerShuffleRequest.cs
index 3573cde1..81afe246 100644
--- a/SpotifyAPI.Web/Models/Request/PlayerShuffleRequest.cs
+++ b/SpotifyAPI.Web/Models/Request/PlayerShuffleRequest.cs
@@ -11,6 +11,7 @@ namespace SpotifyAPI.Web
     public bool State { get; }
 
     [QueryParam("device_id")]
-    public string DeviceId { get; set; }
+    public string? DeviceId { get; set; }
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Request/PlayerSkipNextRequest.cs b/SpotifyAPI.Web/Models/Request/PlayerSkipNextRequest.cs
index 45d94920..9c7e6288 100644
--- a/SpotifyAPI.Web/Models/Request/PlayerSkipNextRequest.cs
+++ b/SpotifyAPI.Web/Models/Request/PlayerSkipNextRequest.cs
@@ -3,6 +3,7 @@ namespace SpotifyAPI.Web
   public class PlayerSkipNextRequest : RequestParams
   {
     [QueryParam("device_id")]
-    public string DeviceId { get; set; }
+    public string? DeviceId { get; set; }
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Request/PlayerSkipPreviousRequest.cs b/SpotifyAPI.Web/Models/Request/PlayerSkipPreviousRequest.cs
index d7c6139f..865a7437 100644
--- a/SpotifyAPI.Web/Models/Request/PlayerSkipPreviousRequest.cs
+++ b/SpotifyAPI.Web/Models/Request/PlayerSkipPreviousRequest.cs
@@ -3,6 +3,7 @@ namespace SpotifyAPI.Web
   public class PlayerSkipPreviousRequest : RequestParams
   {
     [QueryParam("device_id")]
-    public string DeviceId { get; set; }
+    public string? DeviceId { get; set; }
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Request/PlayerTransferPlaybackRequest.cs b/SpotifyAPI.Web/Models/Request/PlayerTransferPlaybackRequest.cs
index 8a946f34..d61fee75 100644
--- a/SpotifyAPI.Web/Models/Request/PlayerTransferPlaybackRequest.cs
+++ b/SpotifyAPI.Web/Models/Request/PlayerTransferPlaybackRequest.cs
@@ -18,3 +18,4 @@ namespace SpotifyAPI.Web
     public bool? Play { get; set; }
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Request/PlayerVolumeRequest.cs b/SpotifyAPI.Web/Models/Request/PlayerVolumeRequest.cs
index b6e8b44c..3f5b18e7 100644
--- a/SpotifyAPI.Web/Models/Request/PlayerVolumeRequest.cs
+++ b/SpotifyAPI.Web/Models/Request/PlayerVolumeRequest.cs
@@ -11,6 +11,7 @@ namespace SpotifyAPI.Web
     public int VolumePercent { get; }
 
     [QueryParam("device_id")]
-    public string DeviceId { get; set; }
+    public string? DeviceId { get; set; }
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Request/PlaylistAddItemsRequest.cs b/SpotifyAPI.Web/Models/Request/PlaylistAddItemsRequest.cs
index d6b6c33d..54a53ca5 100644
--- a/SpotifyAPI.Web/Models/Request/PlaylistAddItemsRequest.cs
+++ b/SpotifyAPI.Web/Models/Request/PlaylistAddItemsRequest.cs
@@ -18,3 +18,4 @@ namespace SpotifyAPI.Web
     public int? Position { get; set; }
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Request/PlaylistChangeDetailsRequest.cs b/SpotifyAPI.Web/Models/Request/PlaylistChangeDetailsRequest.cs
index 82ec1062..ca84a05f 100644
--- a/SpotifyAPI.Web/Models/Request/PlaylistChangeDetailsRequest.cs
+++ b/SpotifyAPI.Web/Models/Request/PlaylistChangeDetailsRequest.cs
@@ -3,7 +3,7 @@ namespace SpotifyAPI.Web
   public class PlaylistChangeDetailsRequest : RequestParams
   {
     [BodyParam("name")]
-    public string Name { get; set; }
+    public string? Name { get; set; }
 
     [BodyParam("public")]
     public bool? Public { get; set; }
@@ -12,6 +12,7 @@ namespace SpotifyAPI.Web
     public bool? Collaborative { get; set; }
 
     [BodyParam("description")]
-    public string Description { get; set; }
+    public string? Description { get; set; }
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Request/PlaylistCreateRequest.cs b/SpotifyAPI.Web/Models/Request/PlaylistCreateRequest.cs
index 55fb1073..1a7c12dc 100644
--- a/SpotifyAPI.Web/Models/Request/PlaylistCreateRequest.cs
+++ b/SpotifyAPI.Web/Models/Request/PlaylistCreateRequest.cs
@@ -19,6 +19,7 @@ namespace SpotifyAPI.Web
     public bool? Collaborative { get; set; }
 
     [BodyParam("description")]
-    public string Description { get; set; }
+    public string? Description { get; set; }
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Request/PlaylistCurrentUsersRequest.cs b/SpotifyAPI.Web/Models/Request/PlaylistCurrentUsersRequest.cs
index 7b180370..c2682274 100644
--- a/SpotifyAPI.Web/Models/Request/PlaylistCurrentUsersRequest.cs
+++ b/SpotifyAPI.Web/Models/Request/PlaylistCurrentUsersRequest.cs
@@ -9,3 +9,4 @@ namespace SpotifyAPI.Web
     public int? Offset { get; set; }
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Request/PlaylistGetItemsRequest.cs b/SpotifyAPI.Web/Models/Request/PlaylistGetItemsRequest.cs
index 0791d570..96f23400 100644
--- a/SpotifyAPI.Web/Models/Request/PlaylistGetItemsRequest.cs
+++ b/SpotifyAPI.Web/Models/Request/PlaylistGetItemsRequest.cs
@@ -23,7 +23,7 @@ namespace SpotifyAPI.Web
     public int? Offset { get; set; }
 
     [QueryParam("market")]
-    public string Market { get; set; }
+    public string? Market { get; set; }
 
     /// <summary>
     ///   This is set to `"track", "episode"` by default.
@@ -43,3 +43,4 @@ namespace SpotifyAPI.Web
     }
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Request/PlaylistGetRequest.cs b/SpotifyAPI.Web/Models/Request/PlaylistGetRequest.cs
index 8b57df6d..42a1a152 100644
--- a/SpotifyAPI.Web/Models/Request/PlaylistGetRequest.cs
+++ b/SpotifyAPI.Web/Models/Request/PlaylistGetRequest.cs
@@ -30,3 +30,4 @@ namespace SpotifyAPI.Web
     }
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Request/PlaylistGetUsersRequest.cs b/SpotifyAPI.Web/Models/Request/PlaylistGetUsersRequest.cs
index 23fd15d0..7be3c0b9 100644
--- a/SpotifyAPI.Web/Models/Request/PlaylistGetUsersRequest.cs
+++ b/SpotifyAPI.Web/Models/Request/PlaylistGetUsersRequest.cs
@@ -9,3 +9,4 @@ namespace SpotifyAPI.Web
     public int? Offset { get; set; }
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Request/PlaylistRemoveItemsRequest.cs b/SpotifyAPI.Web/Models/Request/PlaylistRemoveItemsRequest.cs
index bb4d4d75..8008d558 100644
--- a/SpotifyAPI.Web/Models/Request/PlaylistRemoveItemsRequest.cs
+++ b/SpotifyAPI.Web/Models/Request/PlaylistRemoveItemsRequest.cs
@@ -16,17 +16,18 @@ namespace SpotifyAPI.Web
     public IList<Item> Tracks { get; }
 
     [BodyParam("snapshot_id")]
-    public string SnapshotId { get; set; }
+    public string? SnapshotId { get; set; }
 
     [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1034")]
     public class Item
     {
       [JsonProperty("uri", NullValueHandling = NullValueHandling.Ignore)]
-      public string Uri { get; set; }
+      public string? Uri { get; set; }
 
       [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227")]
       [JsonProperty("positions", NullValueHandling = NullValueHandling.Ignore)]
-      public List<int> Positions { get; set; }
+      public List<int>? Positions { get; set; }
     }
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Request/PlaylistReorderItemsRequest.cs b/SpotifyAPI.Web/Models/Request/PlaylistReorderItemsRequest.cs
index 32d9ccf5..b8179ef5 100644
--- a/SpotifyAPI.Web/Models/Request/PlaylistReorderItemsRequest.cs
+++ b/SpotifyAPI.Web/Models/Request/PlaylistReorderItemsRequest.cs
@@ -18,6 +18,7 @@ namespace SpotifyAPI.Web
     public int? RangeLength { get; set; }
 
     [BodyParam("snapshot_id")]
-    public string SnapshotId { get; set; }
+    public string? SnapshotId { get; set; }
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Request/PlaylistReplaceItemsRequest.cs b/SpotifyAPI.Web/Models/Request/PlaylistReplaceItemsRequest.cs
index 11489270..0ed7c15e 100644
--- a/SpotifyAPI.Web/Models/Request/PlaylistReplaceItemsRequest.cs
+++ b/SpotifyAPI.Web/Models/Request/PlaylistReplaceItemsRequest.cs
@@ -15,3 +15,4 @@ namespace SpotifyAPI.Web
     public IList<string> Uris { get; }
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Request/RecommendationsRequest.cs b/SpotifyAPI.Web/Models/Request/RecommendationsRequest.cs
index b6e6e19e..c8e4564c 100644
--- a/SpotifyAPI.Web/Models/Request/RecommendationsRequest.cs
+++ b/SpotifyAPI.Web/Models/Request/RecommendationsRequest.cs
@@ -28,7 +28,7 @@ namespace SpotifyAPI.Web
     public int? Limit { get; set; }
 
     [QueryParam("market")]
-    public string Market { get; set; }
+    public string? Market { get; set; }
 
     public Dictionary<string, string> Min { get; }
     public Dictionary<string, string> Max { get; }
@@ -61,3 +61,4 @@ namespace SpotifyAPI.Web
     }
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Request/RequestParams.cs b/SpotifyAPI.Web/Models/Request/RequestParams.cs
index feb5505b..2762e4e9 100644
--- a/SpotifyAPI.Web/Models/Request/RequestParams.cs
+++ b/SpotifyAPI.Web/Models/Request/RequestParams.cs
@@ -20,9 +20,8 @@ namespace SpotifyAPI.Web
       var obj = new JObject();
       foreach (var prop in bodyProps)
       {
-        var attribute = prop.GetCustomAttribute(typeof(BodyParamAttribute)) as BodyParamAttribute;
         object value = prop.GetValue(this);
-        if (value != null)
+        if (value != null && prop.GetCustomAttribute(typeof(BodyParamAttribute)) is BodyParamAttribute attribute)
         {
           obj[attribute.Key ?? prop.Name] = JToken.FromObject(value);
         }
@@ -41,9 +40,8 @@ namespace SpotifyAPI.Web
       var queryParams = new Dictionary<string, string>();
       foreach (var prop in queryProps)
       {
-        var attribute = prop.GetCustomAttribute(typeof(QueryParamAttribute)) as QueryParamAttribute;
         object value = prop.GetValue(this);
-        if (value != null)
+        if (value != null && prop.GetCustomAttribute(typeof(QueryParamAttribute)) is QueryParamAttribute attribute)
         {
           if (value is IList<string> list && list.Count > 0)
           {
@@ -91,7 +89,6 @@ namespace SpotifyAPI.Web
   {
     public string Key { get; }
 
-    public QueryParamAttribute() { }
     public QueryParamAttribute(string key)
     {
       Key = key;
@@ -103,10 +100,10 @@ namespace SpotifyAPI.Web
   {
     public string Key { get; }
 
-    public BodyParamAttribute() { }
     public BodyParamAttribute(string key)
     {
       Key = key;
     }
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Request/SearchRequest.cs b/SpotifyAPI.Web/Models/Request/SearchRequest.cs
index 5407a942..fbdf75cf 100644
--- a/SpotifyAPI.Web/Models/Request/SearchRequest.cs
+++ b/SpotifyAPI.Web/Models/Request/SearchRequest.cs
@@ -20,7 +20,7 @@ namespace SpotifyAPI.Web
     public string Query { get; set; }
 
     [QueryParam("market")]
-    public string Market { get; set; }
+    public string? Market { get; set; }
 
     [QueryParam("limit")]
     public int? Limit { get; set; }
@@ -57,3 +57,4 @@ namespace SpotifyAPI.Web
     }
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Request/ShowEpisodesRequest.cs b/SpotifyAPI.Web/Models/Request/ShowEpisodesRequest.cs
index 5f1748db..71c08cef 100644
--- a/SpotifyAPI.Web/Models/Request/ShowEpisodesRequest.cs
+++ b/SpotifyAPI.Web/Models/Request/ShowEpisodesRequest.cs
@@ -9,6 +9,7 @@ namespace SpotifyAPI.Web
     public int? Offset { get; set; }
 
     [QueryParam("market")]
-    public string Market { get; set; }
+    public string? Market { get; set; }
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Request/ShowRequest.cs b/SpotifyAPI.Web/Models/Request/ShowRequest.cs
index 6d632dba..be0726fa 100644
--- a/SpotifyAPI.Web/Models/Request/ShowRequest.cs
+++ b/SpotifyAPI.Web/Models/Request/ShowRequest.cs
@@ -3,6 +3,7 @@ namespace SpotifyAPI.Web
   public class ShowRequest : RequestParams
   {
     [QueryParam("market")]
-    public string Market { get; set; }
+    public string? Market { get; set; }
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Request/ShowsRequest.cs b/SpotifyAPI.Web/Models/Request/ShowsRequest.cs
index eb98f7f1..eccf38fc 100644
--- a/SpotifyAPI.Web/Models/Request/ShowsRequest.cs
+++ b/SpotifyAPI.Web/Models/Request/ShowsRequest.cs
@@ -15,6 +15,7 @@ namespace SpotifyAPI.Web
     public IList<string> Ids { get; }
 
     [QueryParam("market")]
-    public string Market { get; set; }
+    public string? Market { get; set; }
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Request/TrackRequest.cs b/SpotifyAPI.Web/Models/Request/TrackRequest.cs
index 423e5046..5a546e68 100644
--- a/SpotifyAPI.Web/Models/Request/TrackRequest.cs
+++ b/SpotifyAPI.Web/Models/Request/TrackRequest.cs
@@ -3,6 +3,7 @@ namespace SpotifyAPI.Web
   public class TrackRequest : RequestParams
   {
     [QueryParam("market")]
-    public string Market { get; set; }
+    public string? Market { get; set; }
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Request/TracksAudioFeaturesRequest.cs b/SpotifyAPI.Web/Models/Request/TracksAudioFeaturesRequest.cs
index 38449896..ae72beb4 100644
--- a/SpotifyAPI.Web/Models/Request/TracksAudioFeaturesRequest.cs
+++ b/SpotifyAPI.Web/Models/Request/TracksAudioFeaturesRequest.cs
@@ -12,6 +12,7 @@ namespace SpotifyAPI.Web
     }
 
     [QueryParam("ids")]
-    public IList<string> Ids { get; private set; }
+    public IList<string> Ids { get; }
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Request/TracksRequest.cs b/SpotifyAPI.Web/Models/Request/TracksRequest.cs
index 965e6938..9e8aff66 100644
--- a/SpotifyAPI.Web/Models/Request/TracksRequest.cs
+++ b/SpotifyAPI.Web/Models/Request/TracksRequest.cs
@@ -15,6 +15,7 @@ namespace SpotifyAPI.Web
     public IList<string> Ids { get; }
 
     [QueryParam("market")]
-    public string Market { get; set; }
+    public string? Market { get; set; }
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Request/UnfollowRequest.cs b/SpotifyAPI.Web/Models/Request/UnfollowRequest.cs
index a36a272a..514d74cf 100644
--- a/SpotifyAPI.Web/Models/Request/UnfollowRequest.cs
+++ b/SpotifyAPI.Web/Models/Request/UnfollowRequest.cs
@@ -27,3 +27,4 @@ namespace SpotifyAPI.Web
     }
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Response/Actions.cs b/SpotifyAPI.Web/Models/Response/Actions.cs
index 6677ba29..2114a482 100644
--- a/SpotifyAPI.Web/Models/Response/Actions.cs
+++ b/SpotifyAPI.Web/Models/Response/Actions.cs
@@ -4,6 +4,7 @@ namespace SpotifyAPI.Web
 {
   public class Actions
   {
-    public Dictionary<string, bool> Disallows { get; set; }
+    public Dictionary<string, bool> Disallows { get; set; } = default!;
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Response/AlbumsResponse.cs b/SpotifyAPI.Web/Models/Response/AlbumsResponse.cs
index 93f51153..887a6ed2 100644
--- a/SpotifyAPI.Web/Models/Response/AlbumsResponse.cs
+++ b/SpotifyAPI.Web/Models/Response/AlbumsResponse.cs
@@ -4,6 +4,7 @@ namespace SpotifyAPI.Web
 {
   public class AlbumsResponse
   {
-    public List<FullAlbum> Albums { get; set; }
+    public List<FullAlbum> Albums { get; set; } = default!;
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Response/ArtistsRelatedArtistsResponse.cs b/SpotifyAPI.Web/Models/Response/ArtistsRelatedArtistsResponse.cs
index dcbf8a83..ea033668 100644
--- a/SpotifyAPI.Web/Models/Response/ArtistsRelatedArtistsResponse.cs
+++ b/SpotifyAPI.Web/Models/Response/ArtistsRelatedArtistsResponse.cs
@@ -4,6 +4,7 @@ namespace SpotifyAPI.Web
 {
   public class ArtistsRelatedArtistsResponse
   {
-    public List<FullArtist> Artists { get; set; }
+    public List<FullArtist> Artists { get; set; } = default!;
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Response/ArtistsResponse.cs b/SpotifyAPI.Web/Models/Response/ArtistsResponse.cs
index 67d8b488..c47e70f4 100644
--- a/SpotifyAPI.Web/Models/Response/ArtistsResponse.cs
+++ b/SpotifyAPI.Web/Models/Response/ArtistsResponse.cs
@@ -4,6 +4,7 @@ namespace SpotifyAPI.Web
 {
   public class ArtistsResponse
   {
-    public List<FullArtist> Artists { get; set; }
+    public List<FullArtist> Artists { get; set; } = default!;
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Response/ArtistsTopTracksResponse.cs b/SpotifyAPI.Web/Models/Response/ArtistsTopTracksResponse.cs
index 6f6d017e..abf120dc 100644
--- a/SpotifyAPI.Web/Models/Response/ArtistsTopTracksResponse.cs
+++ b/SpotifyAPI.Web/Models/Response/ArtistsTopTracksResponse.cs
@@ -4,6 +4,7 @@ namespace SpotifyAPI.Web
 {
   public class ArtistsTopTracksResponse
   {
-    public List<FullTrack> Tracks { get; set; }
+    public List<FullTrack> Tracks { get; set; } = default!;
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Response/AuthorizationCodeRefreshResponse.cs b/SpotifyAPI.Web/Models/Response/AuthorizationCodeRefreshResponse.cs
index 737d23fc..b50b96af 100644
--- a/SpotifyAPI.Web/Models/Response/AuthorizationCodeRefreshResponse.cs
+++ b/SpotifyAPI.Web/Models/Response/AuthorizationCodeRefreshResponse.cs
@@ -1,14 +1,13 @@
 using System;
-using System.Collections.Generic;
 
 namespace SpotifyAPI.Web
 {
   public class AuthorizationCodeRefreshResponse
   {
-    public string AccessToken { get; set; }
-    public string TokenType { get; set; }
+    public string AccessToken { get; set; } = default!;
+    public string TokenType { get; set; } = default!;
     public int ExpiresIn { get; set; }
-    public string Scope { get; set; }
+    public string Scope { get; set; } = default!;
 
     /// <summary>
     ///   Auto-Initalized to UTC Now
@@ -19,3 +18,4 @@ namespace SpotifyAPI.Web
     public bool IsExpired { get => CreatedAt.AddSeconds(ExpiresIn) <= DateTime.UtcNow; }
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Response/AuthorizationCodeTokenResponse.cs b/SpotifyAPI.Web/Models/Response/AuthorizationCodeTokenResponse.cs
index a380197d..63198867 100644
--- a/SpotifyAPI.Web/Models/Response/AuthorizationCodeTokenResponse.cs
+++ b/SpotifyAPI.Web/Models/Response/AuthorizationCodeTokenResponse.cs
@@ -5,11 +5,11 @@ namespace SpotifyAPI.Web
 {
   public class AuthorizationCodeTokenResponse
   {
-    public string AccessToken { get; set; }
-    public string TokenType { get; set; }
+    public string AccessToken { get; set; } = default!;
+    public string TokenType { get; set; } = default!;
     public int ExpiresIn { get; set; }
-    public string Scope { get; set; }
-    public string RefreshToken { get; set; }
+    public string Scope { get; set; } = default!;
+    public string RefreshToken { get; set; } = default!;
 
     /// <summary>
     ///   Auto-Initalized to UTC Now
@@ -20,3 +20,4 @@ namespace SpotifyAPI.Web
     public bool IsExpired { get => CreatedAt.AddSeconds(ExpiresIn) <= DateTime.UtcNow; }
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Response/CategoriesResponse.cs b/SpotifyAPI.Web/Models/Response/CategoriesResponse.cs
index a609a431..92b2d6f4 100644
--- a/SpotifyAPI.Web/Models/Response/CategoriesResponse.cs
+++ b/SpotifyAPI.Web/Models/Response/CategoriesResponse.cs
@@ -2,6 +2,7 @@ namespace SpotifyAPI.Web
 {
   public class CategoriesResponse
   {
-    public Paging<Category> Categories { get; set; }
+    public Paging<Category> Categories { get; set; } = default!;
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Response/Category.cs b/SpotifyAPI.Web/Models/Response/Category.cs
index 826a150d..66e300fe 100644
--- a/SpotifyAPI.Web/Models/Response/Category.cs
+++ b/SpotifyAPI.Web/Models/Response/Category.cs
@@ -4,9 +4,10 @@ namespace SpotifyAPI.Web
 {
   public class Category
   {
-    public string Href { get; set; }
-    public List<Image> Icons { get; set; }
-    public string Id { get; set; }
-    public string Name { get; set; }
+    public string Href { get; set; } = default!;
+    public List<Image> Icons { get; set; } = default!;
+    public string Id { get; set; } = default!;
+    public string Name { get; set; } = default!;
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Response/CategoryPlaylistsResponse.cs b/SpotifyAPI.Web/Models/Response/CategoryPlaylistsResponse.cs
index f798afa2..1f895bc0 100644
--- a/SpotifyAPI.Web/Models/Response/CategoryPlaylistsResponse.cs
+++ b/SpotifyAPI.Web/Models/Response/CategoryPlaylistsResponse.cs
@@ -2,6 +2,7 @@ namespace SpotifyAPI.Web
 {
   public class CategoryPlaylistsResponse
   {
-    public Paging<SimplePlaylist> Playlists { get; set; }
+    public Paging<SimplePlaylist> Playlists { get; set; } = default!;
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Response/Context.cs b/SpotifyAPI.Web/Models/Response/Context.cs
index 0f4df7e4..924f9f8c 100644
--- a/SpotifyAPI.Web/Models/Response/Context.cs
+++ b/SpotifyAPI.Web/Models/Response/Context.cs
@@ -4,9 +4,10 @@ namespace SpotifyAPI.Web
 {
   public class Context
   {
-    public Dictionary<string, string> ExternalUrls { get; set; }
-    public string Href { get; set; }
-    public string Type { get; set; }
-    public string Uri { get; set; }
+    public Dictionary<string, string> ExternalUrls { get; set; } = default!;
+    public string Href { get; set; } = default!;
+    public string Type { get; set; } = default!;
+    public string Uri { get; set; } = default!;
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Response/Copyright.cs b/SpotifyAPI.Web/Models/Response/Copyright.cs
index d7ee53ef..59dac4c0 100644
--- a/SpotifyAPI.Web/Models/Response/Copyright.cs
+++ b/SpotifyAPI.Web/Models/Response/Copyright.cs
@@ -2,7 +2,8 @@ namespace SpotifyAPI.Web
 {
   public class Copyright
   {
-    public string Text { get; set; }
-    public string Type { get; set; }
+    public string Text { get; set; } = default!;
+    public string Type { get; set; } = default!;
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Response/CredentialsTokenResponse.cs b/SpotifyAPI.Web/Models/Response/CredentialsTokenResponse.cs
index 308a5685..1f51069b 100644
--- a/SpotifyAPI.Web/Models/Response/CredentialsTokenResponse.cs
+++ b/SpotifyAPI.Web/Models/Response/CredentialsTokenResponse.cs
@@ -3,8 +3,8 @@ namespace SpotifyAPI.Web
 {
   public class CredentialsTokenResponse
   {
-    public string AccessToken { get; set; }
-    public string TokenType { get; set; }
+    public string AccessToken { get; set; } = default!;
+    public string TokenType { get; set; } = default!;
     public int ExpiresIn { get; set; }
 
     /// <summary>
@@ -16,3 +16,4 @@ namespace SpotifyAPI.Web
     public bool IsExpired { get => CreatedAt.AddSeconds(ExpiresIn) <= DateTime.UtcNow; }
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Response/CurrentlyPlaying.cs b/SpotifyAPI.Web/Models/Response/CurrentlyPlaying.cs
index 30957af4..e4a82932 100644
--- a/SpotifyAPI.Web/Models/Response/CurrentlyPlaying.cs
+++ b/SpotifyAPI.Web/Models/Response/CurrentlyPlaying.cs
@@ -5,13 +5,14 @@ namespace SpotifyAPI.Web
 {
   public class CurrentlyPlaying
   {
-    public Context Context { get; set; }
-    public string CurrentlyPlayingType { get; set; }
+    public Context Context { get; set; } = default!;
+    public string CurrentlyPlayingType { get; set; } = default!;
     public bool IsPlaying { get; set; }
 
     [JsonConverter(typeof(PlayableItemConverter))]
-    public IPlayableItem Item { get; set; }
+    public IPlayableItem Item { get; set; } = default!;
     public int? ProgressMs { get; set; }
     public long Timestamp { get; set; }
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Response/CurrentlyPlayingContext.cs b/SpotifyAPI.Web/Models/Response/CurrentlyPlayingContext.cs
index 95f9a6c0..8e3b389e 100644
--- a/SpotifyAPI.Web/Models/Response/CurrentlyPlayingContext.cs
+++ b/SpotifyAPI.Web/Models/Response/CurrentlyPlayingContext.cs
@@ -4,18 +4,19 @@ namespace SpotifyAPI.Web
 {
   public class CurrentlyPlayingContext
   {
-    public Device Device { get; set; }
-    public string RepeatState { get; set; }
+    public Device Device { get; set; } = default!;
+    public string RepeatState { get; set; } = default!;
     public bool ShuffleState { get; set; }
-    public Context Context { get; set; }
+    public Context Context { get; set; } = default!;
     public long Timestamp { get; set; }
     public int ProgressMs { get; set; }
     public bool IsPlaying { get; set; }
 
     [JsonConverter(typeof(PlayableItemConverter))]
-    public IPlayableItem Item { get; set; }
+    public IPlayableItem Item { get; set; } = default!;
 
-    public string CurrentlyPlayingType { get; set; }
-    public Actions Actions { get; set; }
+    public string CurrentlyPlayingType { get; set; } = default!;
+    public Actions Actions { get; set; } = default!;
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Response/Cursor.cs b/SpotifyAPI.Web/Models/Response/Cursor.cs
index c49a5fca..20333429 100644
--- a/SpotifyAPI.Web/Models/Response/Cursor.cs
+++ b/SpotifyAPI.Web/Models/Response/Cursor.cs
@@ -2,7 +2,8 @@ namespace SpotifyAPI.Web
 {
   public class Cursor
   {
-    public string Before { get; set; }
-    public string After { get; set; }
+    public string Before { get; set; } = default!;
+    public string After { get; set; } = default!;
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Response/CursorPaging.cs b/SpotifyAPI.Web/Models/Response/CursorPaging.cs
index f996b94a..7b537fcb 100644
--- a/SpotifyAPI.Web/Models/Response/CursorPaging.cs
+++ b/SpotifyAPI.Web/Models/Response/CursorPaging.cs
@@ -4,11 +4,12 @@ namespace SpotifyAPI.Web
 {
   public class CursorPaging<T>
   {
-    public string Href { get; set; }
-    public List<T> Items { get; set; }
+    public string Href { get; set; } = default!;
+    public List<T> Items { get; set; } = default!;
     public int Limit { get; set; }
-    public string Next { get; set; }
-    public Cursor Cursors { get; set; }
+    public string Next { get; set; } = default!;
+    public Cursor Cursors { get; set; } = default!;
     public int Total { get; set; }
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Response/Device.cs b/SpotifyAPI.Web/Models/Response/Device.cs
index f1dafc0a..670e8566 100644
--- a/SpotifyAPI.Web/Models/Response/Device.cs
+++ b/SpotifyAPI.Web/Models/Response/Device.cs
@@ -2,12 +2,13 @@ namespace SpotifyAPI.Web
 {
   public class Device
   {
-    public string Id { get; set; }
+    public string Id { get; set; } = default!;
     public bool IsActive { get; set; }
     public bool IsPrivateSession { get; set; }
     public bool IsRestricted { get; set; }
-    public string Name { get; set; }
-    public string Type { get; set; }
+    public string Name { get; set; } = default!;
+    public string Type { get; set; } = default!;
     public int? VolumePercent { get; set; }
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Response/DeviceResponse.cs b/SpotifyAPI.Web/Models/Response/DeviceResponse.cs
index 5755f65e..fa901bcf 100644
--- a/SpotifyAPI.Web/Models/Response/DeviceResponse.cs
+++ b/SpotifyAPI.Web/Models/Response/DeviceResponse.cs
@@ -4,6 +4,7 @@ namespace SpotifyAPI.Web
 {
   public class DeviceResponse
   {
-    public List<Device> Devices { get; set; }
+    public List<Device> Devices { get; set; } = default!;
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Response/EpisodesResponse.cs b/SpotifyAPI.Web/Models/Response/EpisodesResponse.cs
index 2c8e00e5..f231a5cf 100644
--- a/SpotifyAPI.Web/Models/Response/EpisodesResponse.cs
+++ b/SpotifyAPI.Web/Models/Response/EpisodesResponse.cs
@@ -4,6 +4,7 @@ namespace SpotifyAPI.Web
 {
   public class EpisodesResponse
   {
-    public List<FullEpisode> Episodes { get; set; }
+    public List<FullEpisode> Episodes { get; set; } = default!;
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Response/FeaturedPlaylistsResponse.cs b/SpotifyAPI.Web/Models/Response/FeaturedPlaylistsResponse.cs
index 28cc5472..7a97d741 100644
--- a/SpotifyAPI.Web/Models/Response/FeaturedPlaylistsResponse.cs
+++ b/SpotifyAPI.Web/Models/Response/FeaturedPlaylistsResponse.cs
@@ -2,7 +2,8 @@ namespace SpotifyAPI.Web
 {
   public class FeaturedPlaylistsResponse
   {
-    public string Message { get; set; }
-    public Paging<SimplePlaylist> Playlists { get; set; }
+    public string Message { get; set; } = default!;
+    public Paging<SimplePlaylist> Playlists { get; set; } = default!;
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Response/FollowedArtistsResponse.cs b/SpotifyAPI.Web/Models/Response/FollowedArtistsResponse.cs
index 36947a3f..5609b5fb 100644
--- a/SpotifyAPI.Web/Models/Response/FollowedArtistsResponse.cs
+++ b/SpotifyAPI.Web/Models/Response/FollowedArtistsResponse.cs
@@ -2,6 +2,7 @@ namespace SpotifyAPI.Web
 {
   public class FollowedArtistsResponse
   {
-    public CursorPaging<FullArtist> Artists { get; set; }
+    public CursorPaging<FullArtist> Artists { get; set; } = default!;
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Response/Followers.cs b/SpotifyAPI.Web/Models/Response/Followers.cs
index 282dd0bb..21d7365a 100644
--- a/SpotifyAPI.Web/Models/Response/Followers.cs
+++ b/SpotifyAPI.Web/Models/Response/Followers.cs
@@ -2,8 +2,9 @@ namespace SpotifyAPI.Web
 {
   public class Followers
   {
-    public string Href { get; set; }
+    public string Href { get; set; } = default!;
 
     public int Total { get; set; }
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Response/FullAlbum.cs b/SpotifyAPI.Web/Models/Response/FullAlbum.cs
index cf1975ff..1595a079 100644
--- a/SpotifyAPI.Web/Models/Response/FullAlbum.cs
+++ b/SpotifyAPI.Web/Models/Response/FullAlbum.cs
@@ -4,24 +4,25 @@ namespace SpotifyAPI.Web
 {
   public class FullAlbum
   {
-    public string AlbumType { get; set; }
-    public List<SimpleArtist> Artists { get; set; }
-    public List<string> AvailableMarkets { get; set; }
-    public List<Copyright> Copyrights { get; set; }
-    public Dictionary<string, string> ExternalIds { get; set; }
-    public Dictionary<string, string> ExternalUrls { get; set; }
-    public List<string> Genres { get; set; }
-    public string Href { get; set; }
-    public string Id { get; set; }
-    public List<Image> Images { get; set; }
-    public string Label { get; set; }
-    public string Name { get; set; }
+    public string AlbumType { get; set; } = default!;
+    public List<SimpleArtist> Artists { get; set; } = default!;
+    public List<string> AvailableMarkets { get; set; } = default!;
+    public List<Copyright> Copyrights { get; set; } = default!;
+    public Dictionary<string, string> ExternalIds { get; set; } = default!;
+    public Dictionary<string, string> ExternalUrls { get; set; } = default!;
+    public List<string> Genres { get; set; } = default!;
+    public string Href { get; set; } = default!;
+    public string Id { get; set; } = default!;
+    public List<Image> Images { get; set; } = default!;
+    public string Label { get; set; } = default!;
+    public string Name { get; set; } = default!;
     public int Popularity { get; set; }
-    public string ReleaseDate { get; set; }
-    public string ReleaseDatePrecision { get; set; }
-    public Dictionary<string, string> Restrictions { get; set; }
-    public Paging<SimpleTrack> Tracks { get; set; }
-    public string Type { get; set; }
-    public string Uri { get; set; }
+    public string ReleaseDate { get; set; } = default!;
+    public string ReleaseDatePrecision { get; set; } = default!;
+    public Dictionary<string, string> Restrictions { get; set; } = default!;
+    public Paging<SimpleTrack> Tracks { get; set; } = default!;
+    public string Type { get; set; } = default!;
+    public string Uri { get; set; } = default!;
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Response/FullArtist.cs b/SpotifyAPI.Web/Models/Response/FullArtist.cs
index b0908318..dad28447 100644
--- a/SpotifyAPI.Web/Models/Response/FullArtist.cs
+++ b/SpotifyAPI.Web/Models/Response/FullArtist.cs
@@ -4,15 +4,16 @@ namespace SpotifyAPI.Web
 {
   public class FullArtist
   {
-    public Dictionary<string, string> ExternalUrls { get; set; }
-    public Followers Followers { get; set; }
-    public List<string> Genres { get; set; }
-    public string Href { get; set; }
-    public string Id { get; set; }
-    public List<Image> Images { get; set; }
-    public string Name { get; set; }
+    public Dictionary<string, string> ExternalUrls { get; set; } = default!;
+    public Followers Followers { get; set; } = default!;
+    public List<string> Genres { get; set; } = default!;
+    public string Href { get; set; } = default!;
+    public string Id { get; set; } = default!;
+    public List<Image> Images { get; set; } = default!;
+    public string Name { get; set; } = default!;
     public int Popularity { get; set; }
-    public string Type { get; set; }
-    public string Uri { get; set; }
+    public string Type { get; set; } = default!;
+    public string Uri { get; set; } = default!;
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Response/FullEpisode.cs b/SpotifyAPI.Web/Models/Response/FullEpisode.cs
index 8abff439..733595df 100644
--- a/SpotifyAPI.Web/Models/Response/FullEpisode.cs
+++ b/SpotifyAPI.Web/Models/Response/FullEpisode.cs
@@ -6,25 +6,26 @@ namespace SpotifyAPI.Web
 {
   public class FullEpisode : IPlayableItem
   {
-    public string AudioPreviewUrl { get; set; }
-    public string Description { get; set; }
+    public string AudioPreviewUrl { get; set; } = default!;
+    public string Description { get; set; } = default!;
     public int DurationMs { get; set; }
     public bool Explicit { get; set; }
-    public Dictionary<string, string> ExternalUrls { get; set; }
-    public string Href { get; set; }
-    public string Id { get; set; }
-    public List<Image> Images { get; set; }
+    public Dictionary<string, string> ExternalUrls { get; set; } = default!;
+    public string Href { get; set; } = default!;
+    public string Id { get; set; } = default!;
+    public List<Image> Images { get; set; } = default!;
     public bool IsExternallyHosted { get; set; }
     public bool IsPlayable { get; set; }
-    public List<string> Languages { get; set; }
-    public string Name { get; set; }
-    public string ReleaseDate { get; set; }
-    public string ReleaseDatePrecision { get; set; }
-    public ResumePoint ResumePoint { get; set; }
-    public SimpleShow Show { get; set; }
+    public List<string> Languages { get; set; } = default!;
+    public string Name { get; set; } = default!;
+    public string ReleaseDate { get; set; } = default!;
+    public string ReleaseDatePrecision { get; set; } = default!;
+    public ResumePoint ResumePoint { get; set; } = default!;
+    public SimpleShow Show { get; set; } = default!;
 
     [JsonConverter(typeof(StringEnumConverter))]
     public ItemType Type { get; set; }
-    public string Uri { get; set; }
+    public string Uri { get; set; } = default!;
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Response/FullPlaylist.cs b/SpotifyAPI.Web/Models/Response/FullPlaylist.cs
index e0e39c87..56c21169 100644
--- a/SpotifyAPI.Web/Models/Response/FullPlaylist.cs
+++ b/SpotifyAPI.Web/Models/Response/FullPlaylist.cs
@@ -4,16 +4,17 @@ namespace SpotifyAPI.Web
   public class FullPlaylist
   {
     public bool Collaborative { get; set; }
-    public Dictionary<string, string> ExternalUrls { get; set; }
-    public string Href { get; set; }
-    public string Id { get; set; }
-    public List<Image> Images { get; set; }
-    public string Name { get; set; }
-    public PublicUser Owner { get; set; }
+    public Dictionary<string, string> ExternalUrls { get; set; } = default!;
+    public string Href { get; set; } = default!;
+    public string Id { get; set; } = default!;
+    public List<Image> Images { get; set; } = default!;
+    public string Name { get; set; } = default!;
+    public PublicUser Owner { get; set; } = default!;
     public bool Public { get; set; }
-    public string SnapshotId { get; set; }
-    public Paging<PlaylistTrack<IPlayableItem>> Tracks { get; set; }
-    public string Type { get; set; }
-    public string Uri { get; set; }
+    public string SnapshotId { get; set; } = default!;
+    public Paging<PlaylistTrack<IPlayableItem>> Tracks { get; set; } = default!;
+    public string Type { get; set; } = default!;
+    public string Uri { get; set; } = default!;
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Response/FullShow.cs b/SpotifyAPI.Web/Models/Response/FullShow.cs
index b0311391..44c4ee14 100644
--- a/SpotifyAPI.Web/Models/Response/FullShow.cs
+++ b/SpotifyAPI.Web/Models/Response/FullShow.cs
@@ -4,21 +4,22 @@ namespace SpotifyAPI.Web
 {
   public class FullShow
   {
-    public List<string> AvailableMarkets { get; set; }
-    public List<Copyright> Copyrights { get; set; }
-    public string Description { get; set; }
-    public Paging<SimpleEpisode> Episodes { get; set; }
+    public List<string> AvailableMarkets { get; set; } = default!;
+    public List<Copyright> Copyrights { get; set; } = default!;
+    public string Description { get; set; } = default!;
+    public Paging<SimpleEpisode> Episodes { get; set; } = default!;
     public bool Explicit { get; set; }
-    public Dictionary<string, string> ExternalUrls { get; set; }
-    public string Href { get; set; }
-    public string Id { get; set; }
-    public List<Image> Images { get; set; }
+    public Dictionary<string, string> ExternalUrls { get; set; } = default!;
+    public string Href { get; set; } = default!;
+    public string Id { get; set; } = default!;
+    public List<Image> Images { get; set; } = default!;
     public bool IsExternallyHosted { get; set; }
-    public List<string> Languages { get; set; }
-    public string MediaType { get; set; }
-    public string Name { get; set; }
-    public string Publisher { get; set; }
-    public string Type { get; set; }
-    public string Uri { get; set; }
+    public List<string> Languages { get; set; } = default!;
+    public string MediaType { get; set; } = default!;
+    public string Name { get; set; } = default!;
+    public string Publisher { get; set; } = default!;
+    public string Type { get; set; } = default!;
+    public string Uri { get; set; } = default!;
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Response/FullTrack.cs b/SpotifyAPI.Web/Models/Response/FullTrack.cs
index 046246cf..71331bc8 100644
--- a/SpotifyAPI.Web/Models/Response/FullTrack.cs
+++ b/SpotifyAPI.Web/Models/Response/FullTrack.cs
@@ -6,27 +6,28 @@ namespace SpotifyAPI.Web
 {
   public class FullTrack : IPlayableItem
   {
-    public SimpleAlbum Album { get; set; }
-    public List<SimpleArtist> Artists { get; set; }
-    public List<string> AvailableMarkets { get; set; }
+    public SimpleAlbum Album { get; set; } = default!;
+    public List<SimpleArtist> Artists { get; set; } = default!;
+    public List<string> AvailableMarkets { get; set; } = default!;
     public int DiscNumber { get; set; }
     public int DurationMs { get; set; }
     public bool Explicit { get; set; }
-    public Dictionary<string, string> ExternalIds { get; set; }
-    public Dictionary<string, string> ExternalUrls { get; set; }
-    public string Href { get; set; }
-    public string Id { get; set; }
+    public Dictionary<string, string> ExternalIds { get; set; } = default!;
+    public Dictionary<string, string> ExternalUrls { get; set; } = default!;
+    public string Href { get; set; } = default!;
+    public string Id { get; set; } = default!;
     public bool IsPlayable { get; set; }
-    public LinkedTrack LinkedFrom { get; set; }
-    public Dictionary<string, string> Restrictions { get; set; }
-    public string Name { get; set; }
+    public LinkedTrack LinkedFrom { get; set; } = default!;
+    public Dictionary<string, string> Restrictions { get; set; } = default!;
+    public string Name { get; set; } = default!;
     public int Popularity { get; set; }
-    public string PreviewUrl { get; set; }
+    public string PreviewUrl { get; set; } = default!;
     public int TrackNumber { get; set; }
 
     [JsonConverter(typeof(StringEnumConverter))]
     public ItemType Type { get; set; }
-    public string Uri { get; set; }
+    public string Uri { get; set; } = default!;
     public bool IsLocal { get; set; }
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Response/Image.cs b/SpotifyAPI.Web/Models/Response/Image.cs
index f904d16f..83d70e59 100644
--- a/SpotifyAPI.Web/Models/Response/Image.cs
+++ b/SpotifyAPI.Web/Models/Response/Image.cs
@@ -4,6 +4,7 @@ namespace SpotifyAPI.Web
   {
     public int Height { get; set; }
     public int Width { get; set; }
-    public string Url { get; set; }
+    public string Url { get; set; } = default!;
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Response/Interfaces/IPlaylistElement.cs b/SpotifyAPI.Web/Models/Response/Interfaces/IPlaylistElement.cs
index d879619f..56a5f5ec 100644
--- a/SpotifyAPI.Web/Models/Response/Interfaces/IPlaylistElement.cs
+++ b/SpotifyAPI.Web/Models/Response/Interfaces/IPlaylistElement.cs
@@ -15,3 +15,4 @@ namespace SpotifyAPI.Web
     ItemType Type { get; }
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Response/LinkedTrack.cs b/SpotifyAPI.Web/Models/Response/LinkedTrack.cs
index b16a7624..093f5786 100644
--- a/SpotifyAPI.Web/Models/Response/LinkedTrack.cs
+++ b/SpotifyAPI.Web/Models/Response/LinkedTrack.cs
@@ -3,10 +3,11 @@ namespace SpotifyAPI.Web
 {
   public class LinkedTrack
   {
-    public Dictionary<string, string> ExternalUrls { get; set; }
-    public string Href { get; set; }
-    public string Id { get; set; }
-    public string Type { get; set; }
-    public string Uri { get; set; }
+    public Dictionary<string, string> ExternalUrls { get; set; } = default!;
+    public string Href { get; set; } = default!;
+    public string Id { get; set; } = default!;
+    public string Type { get; set; } = default!;
+    public string Uri { get; set; } = default!;
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Response/NewReleasesResponse.cs b/SpotifyAPI.Web/Models/Response/NewReleasesResponse.cs
index a2ae6f40..4d683c51 100644
--- a/SpotifyAPI.Web/Models/Response/NewReleasesResponse.cs
+++ b/SpotifyAPI.Web/Models/Response/NewReleasesResponse.cs
@@ -2,7 +2,8 @@ namespace SpotifyAPI.Web
 {
   public class NewReleasesResponse
   {
-    public string Message { get; set; }
-    public Paging<SimpleAlbum> Albums { get; set; }
+    public string Message { get; set; } = default!;
+    public Paging<SimpleAlbum> Albums { get; set; } = default!;
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Response/Paging.cs b/SpotifyAPI.Web/Models/Response/Paging.cs
index f9d43cdc..3153532a 100644
--- a/SpotifyAPI.Web/Models/Response/Paging.cs
+++ b/SpotifyAPI.Web/Models/Response/Paging.cs
@@ -4,23 +4,24 @@ namespace SpotifyAPI.Web
 {
   public class Paging<T>
   {
-    public string Href { get; set; }
-    public List<T> Items { get; set; }
+    public string Href { get; set; } = default!;
+    public List<T> Items { get; set; } = default!;
     public int Limit { get; set; }
-    public string Next { get; set; }
+    public string Next { get; set; } = default!;
     public int Offset { get; set; }
-    public string Previous { get; set; }
+    public string Previous { get; set; } = default!;
     public int Total { get; set; }
   }
 
   public class Paging<T, TNext>
   {
-    public string Href { get; set; }
-    public List<T> Items { get; set; }
+    public string Href { get; set; } = default!;
+    public List<T> Items { get; set; } = default!;
     public int Limit { get; set; }
-    public string Next { get; set; }
+    public string Next { get; set; } = default!;
     public int Offset { get; set; }
-    public string Previous { get; set; }
+    public string Previous { get; set; } = default!;
     public int Total { get; set; }
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Response/PlayHistoryItem.cs b/SpotifyAPI.Web/Models/Response/PlayHistoryItem.cs
index 71cef9a7..9aa127ce 100644
--- a/SpotifyAPI.Web/Models/Response/PlayHistoryItem.cs
+++ b/SpotifyAPI.Web/Models/Response/PlayHistoryItem.cs
@@ -3,8 +3,9 @@ namespace SpotifyAPI.Web
 {
   public class PlayHistoryItem
   {
-    public SimpleTrack Track { get; set; }
+    public SimpleTrack Track { get; set; } = default!;
     public DateTime PlayedAt { get; set; }
-    public Context Context { get; set; }
+    public Context Context { get; set; } = default!;
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Response/PlaylistTrack.cs b/SpotifyAPI.Web/Models/Response/PlaylistTrack.cs
index 13d2d24c..ecdf5115 100644
--- a/SpotifyAPI.Web/Models/Response/PlaylistTrack.cs
+++ b/SpotifyAPI.Web/Models/Response/PlaylistTrack.cs
@@ -6,10 +6,11 @@ namespace SpotifyAPI.Web
   public class PlaylistTrack<T>
   {
     public DateTime? AddedAt { get; set; }
-    public PublicUser AddedBy { get; set; }
+    public PublicUser AddedBy { get; set; } = default!;
     public bool IsLocal { get; set; }
 
     [JsonConverter(typeof(PlayableItemConverter))]
-    public T Track { get; set; }
+    public T Track { get; set; } = default!;
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Response/PrivateUser.cs b/SpotifyAPI.Web/Models/Response/PrivateUser.cs
index cc494954..7995df49 100644
--- a/SpotifyAPI.Web/Models/Response/PrivateUser.cs
+++ b/SpotifyAPI.Web/Models/Response/PrivateUser.cs
@@ -5,16 +5,17 @@ namespace SpotifyAPI.Web
 {
   public class PrivateUser
   {
-    public string Country { get; set; }
-    public string DisplayName { get; set; }
-    public string Email { get; set; }
-    public Dictionary<string, string> ExternalUrls { get; set; }
-    public Followers Followers { get; set; }
-    public string Href { get; set; }
-    public string Id { get; set; }
-    public List<Image> Images { get; set; }
-    public string Product { get; set; }
-    public string Type { get; set; }
-    public string Uri { get; set; }
+    public string Country { get; set; } = default!;
+    public string DisplayName { get; set; } = default!;
+    public string Email { get; set; } = default!;
+    public Dictionary<string, string> ExternalUrls { get; set; } = default!;
+    public Followers Followers { get; set; } = default!;
+    public string Href { get; set; } = default!;
+    public string Id { get; set; } = default!;
+    public List<Image> Images { get; set; } = default!;
+    public string Product { get; set; } = default!;
+    public string Type { get; set; } = default!;
+    public string Uri { get; set; } = default!;
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Response/PublicUser.cs b/SpotifyAPI.Web/Models/Response/PublicUser.cs
index a739c4bc..b7d0cffe 100644
--- a/SpotifyAPI.Web/Models/Response/PublicUser.cs
+++ b/SpotifyAPI.Web/Models/Response/PublicUser.cs
@@ -5,13 +5,14 @@ namespace SpotifyAPI.Web
 {
   public class PublicUser
   {
-    public string DisplayName { get; set; }
-    public Dictionary<string, string> ExternalUrls { get; set; }
-    public Followers Followers { get; set; }
-    public string Href { get; set; }
-    public string Id { get; set; }
-    public List<Image> Images { get; set; }
-    public string Type { get; set; }
-    public string Uri { get; set; }
+    public string DisplayName { get; set; } = default!;
+    public Dictionary<string, string> ExternalUrls { get; set; } = default!;
+    public Followers Followers { get; set; } = default!;
+    public string Href { get; set; } = default!;
+    public string Id { get; set; } = default!;
+    public List<Image> Images { get; set; } = default!;
+    public string Type { get; set; } = default!;
+    public string Uri { get; set; } = default!;
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Response/RecommendationGenresResponse.cs b/SpotifyAPI.Web/Models/Response/RecommendationGenresResponse.cs
index f68644c4..07027b06 100644
--- a/SpotifyAPI.Web/Models/Response/RecommendationGenresResponse.cs
+++ b/SpotifyAPI.Web/Models/Response/RecommendationGenresResponse.cs
@@ -4,6 +4,7 @@ namespace SpotifyAPI.Web
 {
   public class RecommendationGenresResponse
   {
-    public List<string> Genres { get; set; }
+    public List<string> Genres { get; set; } = default!;
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Response/RecommendationSeed.cs b/SpotifyAPI.Web/Models/Response/RecommendationSeed.cs
index c8ab076b..abb6c7e5 100644
--- a/SpotifyAPI.Web/Models/Response/RecommendationSeed.cs
+++ b/SpotifyAPI.Web/Models/Response/RecommendationSeed.cs
@@ -9,10 +9,11 @@ namespace SpotifyAPI.Web
 
     [JsonProperty("afterRelinkingSize")]
     public int AfterRelinkingSize { get; set; }
-    public string Href { get; set; }
-    public string Id { get; set; }
+    public string Href { get; set; } = default!;
+    public string Id { get; set; } = default!;
     [JsonProperty("initialPoolSize")]
     public int InitialPoolSize { get; set; }
-    public string Type { get; set; }
+    public string Type { get; set; } = default!;
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Response/RecommendationsResponse.cs b/SpotifyAPI.Web/Models/Response/RecommendationsResponse.cs
index c79d45c8..f97b59e8 100644
--- a/SpotifyAPI.Web/Models/Response/RecommendationsResponse.cs
+++ b/SpotifyAPI.Web/Models/Response/RecommendationsResponse.cs
@@ -4,7 +4,8 @@ namespace SpotifyAPI.Web
 {
   public class RecommendationsResponse
   {
-    public List<RecommendationSeed> Seeds { get; set; }
-    public List<SimpleTrack> Tracks { get; set; }
+    public List<RecommendationSeed> Seeds { get; set; } = default!;
+    public List<SimpleTrack> Tracks { get; set; } = default!;
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Response/ResumePointObject.cs b/SpotifyAPI.Web/Models/Response/ResumePointObject.cs
index 52afa146..a5d9173b 100644
--- a/SpotifyAPI.Web/Models/Response/ResumePointObject.cs
+++ b/SpotifyAPI.Web/Models/Response/ResumePointObject.cs
@@ -6,3 +6,4 @@ namespace SpotifyAPI.Web
     public int ResumePositionMs { get; set; }
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Response/SavedAlbum.cs b/SpotifyAPI.Web/Models/Response/SavedAlbum.cs
index 12bac1a3..0415e27b 100644
--- a/SpotifyAPI.Web/Models/Response/SavedAlbum.cs
+++ b/SpotifyAPI.Web/Models/Response/SavedAlbum.cs
@@ -5,6 +5,7 @@ namespace SpotifyAPI.Web
   public class SavedAlbum
   {
     public DateTime AddedAt { get; set; }
-    public FullAlbum Album { get; set; }
+    public FullAlbum Album { get; set; } = default!;
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Response/SavedShow.cs b/SpotifyAPI.Web/Models/Response/SavedShow.cs
index 97c5c4d0..48402d1d 100644
--- a/SpotifyAPI.Web/Models/Response/SavedShow.cs
+++ b/SpotifyAPI.Web/Models/Response/SavedShow.cs
@@ -5,6 +5,7 @@ namespace SpotifyAPI.Web
   public class SavedShow
   {
     public DateTime AddedAt { get; set; }
-    public FullShow Show { get; set; }
+    public FullShow Show { get; set; } = default!;
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Response/SavedTrack.cs b/SpotifyAPI.Web/Models/Response/SavedTrack.cs
index e7a7b61e..b6d0b1b8 100644
--- a/SpotifyAPI.Web/Models/Response/SavedTrack.cs
+++ b/SpotifyAPI.Web/Models/Response/SavedTrack.cs
@@ -5,6 +5,7 @@ namespace SpotifyAPI.Web
   public class SavedTrack
   {
     public DateTime AddedAt { get; set; }
-    public FullTrack Track { get; set; }
+    public FullTrack Track { get; set; } = default!;
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Response/SearchResponse.cs b/SpotifyAPI.Web/Models/Response/SearchResponse.cs
index 5cc1553b..01ba65b4 100644
--- a/SpotifyAPI.Web/Models/Response/SearchResponse.cs
+++ b/SpotifyAPI.Web/Models/Response/SearchResponse.cs
@@ -2,10 +2,11 @@ namespace SpotifyAPI.Web
 {
   public class SearchResponse
   {
-    public Paging<FullArtist, SearchResponse> Artists { get; set; }
-    public Paging<SimpleAlbum, SearchResponse> Albums { get; set; }
-    public Paging<FullTrack, SearchResponse> Tracks { get; set; }
-    public Paging<SimpleShow, SearchResponse> Shows { get; set; }
-    public Paging<SimpleEpisode, SearchResponse> Episodes { get; set; }
+    public Paging<FullArtist, SearchResponse> Artists { get; set; } = default!;
+    public Paging<SimpleAlbum, SearchResponse> Albums { get; set; } = default!;
+    public Paging<FullTrack, SearchResponse> Tracks { get; set; } = default!;
+    public Paging<SimpleShow, SearchResponse> Shows { get; set; } = default!;
+    public Paging<SimpleEpisode, SearchResponse> Episodes { get; set; } = default!;
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Response/Section.cs b/SpotifyAPI.Web/Models/Response/Section.cs
index 49816a85..a2aaa32e 100644
--- a/SpotifyAPI.Web/Models/Response/Section.cs
+++ b/SpotifyAPI.Web/Models/Response/Section.cs
@@ -16,3 +16,4 @@ namespace SpotifyAPI.Web
     public float TimeSignatureConfidence { get; set; }
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Response/Segment.cs b/SpotifyAPI.Web/Models/Response/Segment.cs
index 3827e169..cb90683e 100644
--- a/SpotifyAPI.Web/Models/Response/Segment.cs
+++ b/SpotifyAPI.Web/Models/Response/Segment.cs
@@ -11,7 +11,8 @@ namespace SpotifyAPI.Web
     public float LoudnessMax { get; set; }
     public float LoudnessMaxTime { get; set; }
     public float LoudnessEnd { get; set; }
-    public List<float> Pitches { get; set; }
-    public List<float> Timbre { get; set; }
+    public List<float> Pitches { get; set; } = default!;
+    public List<float> Timbre { get; set; } = default!;
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Response/ShowsResponse.cs b/SpotifyAPI.Web/Models/Response/ShowsResponse.cs
index 5ed668aa..08e001ca 100644
--- a/SpotifyAPI.Web/Models/Response/ShowsResponse.cs
+++ b/SpotifyAPI.Web/Models/Response/ShowsResponse.cs
@@ -4,6 +4,7 @@ namespace SpotifyAPI.Web
 {
   public class ShowsResponse
   {
-    public List<SimpleShow> Shows { get; set; }
+    public List<SimpleShow> Shows { get; set; } = default!;
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Response/SimpleAlbum.cs b/SpotifyAPI.Web/Models/Response/SimpleAlbum.cs
index 78eb47ee..b9140b69 100644
--- a/SpotifyAPI.Web/Models/Response/SimpleAlbum.cs
+++ b/SpotifyAPI.Web/Models/Response/SimpleAlbum.cs
@@ -4,19 +4,20 @@ namespace SpotifyAPI.Web
 {
   public class SimpleAlbum
   {
-    public string AlbumGroup { get; set; }
-    public string AlbumType { get; set; }
-    public List<SimpleArtist> Artists { get; set; }
-    public List<string> AvailableMarkets { get; set; }
-    public Dictionary<string, string> ExternalUrls { get; set; }
-    public string Href { get; set; }
-    public string Id { get; set; }
-    public List<Image> Images { get; set; }
-    public string Name { get; set; }
-    public string ReleaseDate { get; set; }
-    public string ReleaseDatePrecision { get; set; }
-    public Dictionary<string, string> Restrictions { get; set; }
-    public string Type { get; set; }
-    public string Uri { get; set; }
+    public string AlbumGroup { get; set; } = default!;
+    public string AlbumType { get; set; } = default!;
+    public List<SimpleArtist> Artists { get; set; } = default!;
+    public List<string> AvailableMarkets { get; set; } = default!;
+    public Dictionary<string, string> ExternalUrls { get; set; } = default!;
+    public string Href { get; set; } = default!;
+    public string Id { get; set; } = default!;
+    public List<Image> Images { get; set; } = default!;
+    public string Name { get; set; } = default!;
+    public string ReleaseDate { get; set; } = default!;
+    public string ReleaseDatePrecision { get; set; } = default!;
+    public Dictionary<string, string> Restrictions { get; set; } = default!;
+    public string Type { get; set; } = default!;
+    public string Uri { get; set; } = default!;
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Response/SimpleArtist.cs b/SpotifyAPI.Web/Models/Response/SimpleArtist.cs
index b272e812..da8ae4b6 100644
--- a/SpotifyAPI.Web/Models/Response/SimpleArtist.cs
+++ b/SpotifyAPI.Web/Models/Response/SimpleArtist.cs
@@ -3,11 +3,12 @@ namespace SpotifyAPI.Web
 {
   public class SimpleArtist
   {
-    public Dictionary<string, string> ExternalUrls { get; set; }
-    public string Href { get; set; }
-    public string Id { get; set; }
-    public string Name { get; set; }
-    public string Type { get; set; }
-    public string Uri { get; set; }
+    public Dictionary<string, string> ExternalUrls { get; set; } = default!;
+    public string Href { get; set; } = default!;
+    public string Id { get; set; } = default!;
+    public string Name { get; set; } = default!;
+    public string Type { get; set; } = default!;
+    public string Uri { get; set; } = default!;
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Response/SimpleEpisode.cs b/SpotifyAPI.Web/Models/Response/SimpleEpisode.cs
index 547ca019..eb48e0fd 100644
--- a/SpotifyAPI.Web/Models/Response/SimpleEpisode.cs
+++ b/SpotifyAPI.Web/Models/Response/SimpleEpisode.cs
@@ -7,27 +7,28 @@ namespace SpotifyAPI.Web
 {
   public class SimpleEpisode
   {
-    public string AudioPreviewUrl { get; set; }
-    public string Description { get; set; }
+    public string AudioPreviewUrl { get; set; } = default!;
+    public string Description { get; set; } = default!;
     public int DurationMs { get; set; }
     public bool Explicit { get; set; }
-    public Dictionary<string, string> ExternalUrls { get; set; }
-    public string Href { get; set; }
-    public string Id { get; set; }
-    public List<Image> Images { get; set; }
+    public Dictionary<string, string> ExternalUrls { get; set; } = default!;
+    public string Href { get; set; } = default!;
+    public string Id { get; set; } = default!;
+    public List<Image> Images { get; set; } = default!;
     public bool IsExternallyHosted { get; set; }
     public bool IsPlayable { get; set; }
 
     [Obsolete("This field is deprecated and might be removed in the future. Please use the languages field instead")]
-    public string Language { get; set; }
-    public List<string> Languages { get; set; }
-    public string Name { get; set; }
-    public string ReleaseDate { get; set; }
-    public string ReleaseDatePrecision { get; set; }
-    public ResumePoint ResumePoint { get; set; }
+    public string Language { get; set; } = default!;
+    public List<string> Languages { get; set; } = default!;
+    public string Name { get; set; } = default!;
+    public string ReleaseDate { get; set; } = default!;
+    public string ReleaseDatePrecision { get; set; } = default!;
+    public ResumePoint ResumePoint { get; set; } = default!;
 
     [JsonConverter(typeof(StringEnumConverter))]
     public ItemType Type { get; set; }
-    public string Uri { get; set; }
+    public string Uri { get; set; } = default!;
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Response/SimplePlaylist.cs b/SpotifyAPI.Web/Models/Response/SimplePlaylist.cs
index 35217056..125fb6d3 100644
--- a/SpotifyAPI.Web/Models/Response/SimplePlaylist.cs
+++ b/SpotifyAPI.Web/Models/Response/SimplePlaylist.cs
@@ -7,17 +7,18 @@ namespace SpotifyAPI.Web
   public class SimplePlaylist
   {
     public bool Collaborative { get; set; }
-    public string Description { get; set; }
-    public Dictionary<string, string> ExternalUrls { get; set; }
-    public string Href { get; set; }
-    public string Id { get; set; }
-    public List<Image> Images { get; set; }
-    public string Name { get; set; }
-    public PublicUser Owner { get; set; }
+    public string Description { get; set; } = default!;
+    public Dictionary<string, string> ExternalUrls { get; set; } = default!;
+    public string Href { get; set; } = default!;
+    public string Id { get; set; } = default!;
+    public List<Image> Images { get; set; } = default!;
+    public string Name { get; set; } = default!;
+    public PublicUser Owner { get; set; } = default!;
     public bool? Public { get; set; }
-    public string SnapshotId { get; set; }
-    public Paging<PlaylistTrack<IPlayableItem>> Tracks { get; set; }
-    public string Type { get; set; }
-    public string Uri { get; set; }
+    public string SnapshotId { get; set; } = default!;
+    public Paging<PlaylistTrack<IPlayableItem>> Tracks { get; set; } = default!;
+    public string Type { get; set; } = default!;
+    public string Uri { get; set; } = default!;
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Response/SimpleShow.cs b/SpotifyAPI.Web/Models/Response/SimpleShow.cs
index 1654ea2e..d5e56f51 100644
--- a/SpotifyAPI.Web/Models/Response/SimpleShow.cs
+++ b/SpotifyAPI.Web/Models/Response/SimpleShow.cs
@@ -4,20 +4,21 @@ namespace SpotifyAPI.Web
 {
   public class SimpleShow
   {
-    public List<string> AvailableMarkets { get; set; }
-    public List<Copyright> Copyrights { get; set; }
-    public string Description { get; set; }
+    public List<string> AvailableMarkets { get; set; } = default!;
+    public List<Copyright> Copyrights { get; set; } = default!;
+    public string Description { get; set; } = default!;
     public bool Explicit { get; set; }
-    public Dictionary<string, string> ExternalUrls { get; set; }
-    public string Href { get; set; }
-    public string Id { get; set; }
-    public List<Image> Images { get; set; }
+    public Dictionary<string, string> ExternalUrls { get; set; } = default!;
+    public string Href { get; set; } = default!;
+    public string Id { get; set; } = default!;
+    public List<Image> Images { get; set; } = default!;
     public bool IsExternallyHosted { get; set; }
-    public List<string> Languages { get; set; }
-    public string MediaType { get; set; }
-    public string Name { get; set; }
-    public string Publisher { get; set; }
-    public string Type { get; set; }
-    public string Uri { get; set; }
+    public List<string> Languages { get; set; } = default!;
+    public string MediaType { get; set; } = default!;
+    public string Name { get; set; } = default!;
+    public string Publisher { get; set; } = default!;
+    public string Type { get; set; } = default!;
+    public string Uri { get; set; } = default!;
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Response/SimpleTrack.cs b/SpotifyAPI.Web/Models/Response/SimpleTrack.cs
index 71462dd0..c395f141 100644
--- a/SpotifyAPI.Web/Models/Response/SimpleTrack.cs
+++ b/SpotifyAPI.Web/Models/Response/SimpleTrack.cs
@@ -6,22 +6,23 @@ namespace SpotifyAPI.Web
 {
   public class SimpleTrack
   {
-    public List<SimpleArtist> Artists { get; set; }
-    public List<string> AvailableMarkets { get; set; }
+    public List<SimpleArtist> Artists { get; set; } = default!;
+    public List<string> AvailableMarkets { get; set; } = default!;
     public int DiscNumber { get; set; }
     public int DurationMs { get; set; }
     public bool Explicit { get; set; }
-    public Dictionary<string, string> ExternalUrls { get; set; }
-    public string Href { get; set; }
-    public string Id { get; set; }
+    public Dictionary<string, string> ExternalUrls { get; set; } = default!;
+    public string Href { get; set; } = default!;
+    public string Id { get; set; } = default!;
     public bool IsPlayable { get; set; }
-    public LinkedTrack LinkedFrom { get; set; }
-    public string Name { get; set; }
-    public string PreviewUrl { get; set; }
+    public LinkedTrack LinkedFrom { get; set; } = default!;
+    public string Name { get; set; } = default!;
+    public string PreviewUrl { get; set; } = default!;
     public int TrackNumber { get; set; }
 
     [JsonConverter(typeof(StringEnumConverter))]
     public ItemType Type { get; set; }
-    public string Uri { get; set; }
+    public string Uri { get; set; } = default!;
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Response/SnapshotResponse.cs b/SpotifyAPI.Web/Models/Response/SnapshotResponse.cs
index 97ebe950..ccf6a07b 100644
--- a/SpotifyAPI.Web/Models/Response/SnapshotResponse.cs
+++ b/SpotifyAPI.Web/Models/Response/SnapshotResponse.cs
@@ -2,6 +2,7 @@ namespace SpotifyAPI.Web
 {
   public class SnapshotResponse
   {
-    public string SnapshotId { get; set; }
+    public string SnapshotId { get; set; } = default!;
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Response/TimeInterval.cs b/SpotifyAPI.Web/Models/Response/TimeInterval.cs
index 0d462438..036c50df 100644
--- a/SpotifyAPI.Web/Models/Response/TimeInterval.cs
+++ b/SpotifyAPI.Web/Models/Response/TimeInterval.cs
@@ -7,3 +7,4 @@ namespace SpotifyAPI.Web
     public float Confidence { get; set; }
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Response/TrackAudioAnalysis.cs b/SpotifyAPI.Web/Models/Response/TrackAudioAnalysis.cs
index 32e3be1a..e62fef4d 100644
--- a/SpotifyAPI.Web/Models/Response/TrackAudioAnalysis.cs
+++ b/SpotifyAPI.Web/Models/Response/TrackAudioAnalysis.cs
@@ -4,10 +4,11 @@ namespace SpotifyAPI.Web
 {
   public class TrackAudioAnalysis
   {
-    public List<TimeInterval> Bars { get; set; }
-    public List<TimeInterval> Beats { get; set; }
-    public List<Section> Sections { get; set; }
-    public List<Segment> Segments { get; set; }
-    public List<TimeInterval> Tatums { get; set; }
+    public List<TimeInterval> Bars { get; set; } = default!;
+    public List<TimeInterval> Beats { get; set; } = default!;
+    public List<Section> Sections { get; set; } = default!;
+    public List<Segment> Segments { get; set; } = default!;
+    public List<TimeInterval> Tatums { get; set; } = default!;
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Response/TrackAudioFeatures.cs b/SpotifyAPI.Web/Models/Response/TrackAudioFeatures.cs
index c7027df9..99d0d650 100644
--- a/SpotifyAPI.Web/Models/Response/TrackAudioFeatures.cs
+++ b/SpotifyAPI.Web/Models/Response/TrackAudioFeatures.cs
@@ -3,11 +3,11 @@ namespace SpotifyAPI.Web
   public class TrackAudioFeatures
   {
     public float Acousticness { get; set; }
-    public string AnalysisUrl { get; set; }
+    public string AnalysisUrl { get; set; } = default!;
     public float Danceability { get; set; }
     public int DurationMs { get; set; }
     public float Energy { get; set; }
-    public string Id { get; set; }
+    public string Id { get; set; } = default!;
     public float Instrumentalness { get; set; }
     public int Key { get; set; }
     public float Liveness { get; set; }
@@ -16,9 +16,10 @@ namespace SpotifyAPI.Web
     public float Speechiness { get; set; }
     public float Tempo { get; set; }
     public int TimeSignature { get; set; }
-    public string TrackHref { get; set; }
-    public string Type { get; set; }
-    public string Uri { get; set; }
+    public string TrackHref { get; set; } = default!;
+    public string Type { get; set; } = default!;
+    public string Uri { get; set; } = default!;
     public float Valence { get; set; }
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Response/TracksAudioFeaturesResponse.cs b/SpotifyAPI.Web/Models/Response/TracksAudioFeaturesResponse.cs
index 04611821..0640dcb2 100644
--- a/SpotifyAPI.Web/Models/Response/TracksAudioFeaturesResponse.cs
+++ b/SpotifyAPI.Web/Models/Response/TracksAudioFeaturesResponse.cs
@@ -4,6 +4,7 @@ namespace SpotifyAPI.Web
 {
   public class TracksAudioFeaturesResponse
   {
-    public List<TrackAudioFeatures> AudioFeatures { get; set; }
+    public List<TrackAudioFeatures> AudioFeatures { get; set; } = default!;
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Response/TracksResponse.cs b/SpotifyAPI.Web/Models/Response/TracksResponse.cs
index 4c075a44..6bb2d629 100644
--- a/SpotifyAPI.Web/Models/Response/TracksResponse.cs
+++ b/SpotifyAPI.Web/Models/Response/TracksResponse.cs
@@ -4,6 +4,7 @@ namespace SpotifyAPI.Web
 {
   public class TracksResponse
   {
-    public List<FullTrack> Tracks { get; set; }
+    public List<FullTrack> Tracks { get; set; } = default!;
   }
 }
+
diff --git a/SpotifyAPI.Web/Models/Scopes.cs b/SpotifyAPI.Web/Models/Scopes.cs
index 6124c953..5b311b85 100644
--- a/SpotifyAPI.Web/Models/Scopes.cs
+++ b/SpotifyAPI.Web/Models/Scopes.cs
@@ -23,3 +23,4 @@ namespace SpotifyAPI.Web
     public const string UserFollowModify = "user-follow-modify";
   }
 }
+
diff --git a/SpotifyAPI.Web/SpotifyAPI.Web.csproj b/SpotifyAPI.Web/SpotifyAPI.Web.csproj
index 8e45743b..fc05d906 100644
--- a/SpotifyAPI.Web/SpotifyAPI.Web.csproj
+++ b/SpotifyAPI.Web/SpotifyAPI.Web.csproj
@@ -2,6 +2,8 @@
 
   <PropertyGroup>
     <TargetFrameworks>netstandard2.1;netstandard2.0</TargetFrameworks>
+    <LangVersion>8.0</LangVersion>
+    <Nullable>enable</Nullable>
     <!-- <GenerateDocumentationFile>true</GenerateDocumentationFile> -->
     <PackageId>SpotifyAPI.Web</PackageId>
     <Title>SpotifyAPI.Web</Title>
diff --git a/SpotifyAPI.Web/Util/URIParameterFormatProvider.cs b/SpotifyAPI.Web/Util/URIParameterFormatProvider.cs
index a7b861d6..6fbcd81a 100644
--- a/SpotifyAPI.Web/Util/URIParameterFormatProvider.cs
+++ b/SpotifyAPI.Web/Util/URIParameterFormatProvider.cs
@@ -11,7 +11,7 @@ namespace SpotifyAPI.Web
       _formatter = new URIParameterFormatter();
     }
 
-    public object GetFormat(Type formatType)
+    public object? GetFormat(Type formatType)
     {
       return formatType == typeof(ICustomFormatter) ? _formatter : null;
     }