diff --git a/src/GraphQL.Client.Http/GraphQLHttpClient.cs b/src/GraphQL.Client.Http/GraphQLHttpClient.cs
index b9064fd6..9a55c77e 100644
--- a/src/GraphQL.Client.Http/GraphQLHttpClient.cs
+++ b/src/GraphQL.Client.Http/GraphQLHttpClient.cs
@@ -115,7 +115,7 @@ private async Task<GraphQLResponse<TResponse>> SendHttpPostRequestAsync<TRespons
 
 		private HttpRequestMessage GenerateHttpRequestMessage(GraphQLRequest request) {
 			var message = new HttpRequestMessage(HttpMethod.Post, this.Options.EndPoint) {
-				Content = new StringContent(request.SerializeToJson(Options), Encoding.UTF8, "application/json")
+				Content = new StringContent(request.SerializeToJson(Options), Encoding.UTF8, Options.MediaType)
 			};
 
 			if (request is GraphQLHttpRequest httpRequest)
diff --git a/src/GraphQL.Client.Http/GraphQLHttpClientOptions.cs b/src/GraphQL.Client.Http/GraphQLHttpClientOptions.cs
index d1c139f4..2eda001e 100644
--- a/src/GraphQL.Client.Http/GraphQLHttpClientOptions.cs
+++ b/src/GraphQL.Client.Http/GraphQLHttpClientOptions.cs
@@ -4,6 +4,7 @@
 using System.Text.Json;
 using System.Threading.Tasks;
 using Dahomey.Json;
+using Dahomey.Json.Serialization.Converters.Factories;
 
 namespace GraphQL.Client.Http {
 
@@ -20,9 +21,7 @@ public class GraphQLHttpClientOptions {
 		/// <summary>
 		/// The <see cref="JsonSerializerOptions"/> that is going to be used
 		/// </summary>
-		public JsonSerializerOptions JsonSerializerOptions { get; set; } = new JsonSerializerOptions {
-			PropertyNamingPolicy = JsonNamingPolicy.CamelCase
-		}.SetupExtensions();
+		public JsonSerializerOptions JsonSerializerOptions { get; set; } = GetDefaultJsonSerializerOptions();
 
 		/// <summary>
 		/// The <see cref="System.Net.Http.HttpMessageHandler"/> that is going to be used
@@ -32,13 +31,13 @@ public class GraphQLHttpClientOptions {
 		/// <summary>
 		/// The <see cref="MediaTypeHeaderValue"/> that will be send on POST
 		/// </summary>
-		public MediaTypeHeaderValue MediaType { get; set; } = MediaTypeHeaderValue.Parse("application/json; charset=utf-8"); // This should be "application/graphql" also "application/x-www-form-urlencoded" is Accepted
+		public string MediaType { get; set; } = "application/json"; // This should be "application/graphql" also "application/x-www-form-urlencoded" is Accepted
 
 		/// <summary>
 		/// The back-off strategy for automatic websocket/subscription reconnects. Calculates the delay before the next connection attempt is made.<br/>
 		/// default formula: min(n, 5) * 1,5 * random(0.0, 1.0)
 		/// </summary>
-		public Func<int, TimeSpan> BackOffStrategy = n => {
+		public Func<int, TimeSpan> BackOffStrategy { get; set; } = n => {
 			var rnd = new Random();
 			return TimeSpan.FromSeconds(Math.Min(n, 5) * 1.5 + rnd.NextDouble());
 		};
@@ -53,5 +52,24 @@ public class GraphQLHttpClientOptions {
 		/// </summary>
 		public Func<GraphQLRequest, GraphQLHttpClient, Task<GraphQLRequest>> PreprocessRequest { get; set; } = (request, client) => Task.FromResult(request);
 
+		/// <summary>
+		/// Generates the default <see cref="JsonSerializerOptions"/>
+		/// </summary>
+		/// <returns></returns>
+		public static JsonSerializerOptions GetDefaultJsonSerializerOptions() {
+			var options = new JsonSerializerOptions {
+				PropertyNamingPolicy = JsonNamingPolicy.CamelCase
+			};
+
+			//options.Converters.Add(new JsonSerializerOptionsState(options));
+			//options.Converters.Add(new DictionaryConverterFactory());
+			//options.Converters.Add(new CollectionConverterFactory());
+			//options.Converters.Add(new JsonNodeConverterFactory());
+			//options.Converters.Add(new ObjectConverterFactory());
+
+			options.SetupExtensions();
+
+			return options;
+		}
 	}
 }
diff --git a/src/GraphQL.Client.Http/GraphQLSerializationExtensions.cs b/src/GraphQL.Client.Http/GraphQLSerializationExtensions.cs
index a0a6d271..758a8245 100644
--- a/src/GraphQL.Client.Http/GraphQLSerializationExtensions.cs
+++ b/src/GraphQL.Client.Http/GraphQLSerializationExtensions.cs
@@ -2,6 +2,8 @@
 using System.Text.Json;
 using System.Threading;
 using System.Threading.Tasks;
+using Dahomey.Json;
+using Dahomey.Json.Serialization.Converters.Factories;
 
 namespace GraphQL.Client.Http {
 	public static class GraphQLSerializationExtensions {
@@ -21,5 +23,14 @@ public static ValueTask<TGraphQLResponse> DeserializeFromJsonAsync<TGraphQLRespo
 			return JsonSerializer.DeserializeAsync<TGraphQLResponse>(stream, options.JsonSerializerOptions, cancellationToken);
 		}
 
+		public static JsonSerializerOptions SetupDahomeyJson(this JsonSerializerOptions options) {
+			options.Converters.Add(new JsonSerializerOptionsState(options));
+			options.Converters.Add(new DictionaryConverterFactory());
+			options.Converters.Add(new CollectionConverterFactory());
+			//options.Converters.Add(new JsonNodeConverterFactory());
+			options.Converters.Add(new ObjectConverterFactory());
+
+			return options;
+		}
 	}
 }
diff --git a/src/GraphQL.Client/GraphQL.Client.csproj b/src/GraphQL.Client/GraphQL.Client.csproj
index 78633fd1..1c883480 100644
--- a/src/GraphQL.Client/GraphQL.Client.csproj
+++ b/src/GraphQL.Client/GraphQL.Client.csproj
@@ -12,6 +12,7 @@
 	</ItemGroup>
 
 	<ItemGroup>
+		<PackageReference Include="System.Text.Json" Version="4.7.0" />
 		<PackageReference Include="System.Reactive" Version="4.1.2" />
         <PackageReference Include="Microsoft.CSharp" Version="4.7.0" />
 	</ItemGroup>
diff --git a/src/GraphQL.Client/GraphQLResponse.cs b/src/GraphQL.Client/GraphQLResponse.cs
index 81c163d5..64c28ac5 100644
--- a/src/GraphQL.Client/GraphQLResponse.cs
+++ b/src/GraphQL.Client/GraphQLResponse.cs
@@ -1,23 +1,28 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using System.Text.Json;
+using System.Text.Json.Serialization;
 
 namespace GraphQL.Client {
 
 	public class GraphQLResponse<T> : IEquatable<GraphQLResponse<T>?> {
 
+		[JsonPropertyName("data")]
 		public T Data { get; set; }
 
+		[JsonPropertyName("errors")]
 		public GraphQLError[]? Errors { get; set; }
 
-		public IDictionary<string, dynamic>? Extensions { get; set; }
+		[JsonPropertyName("extensions")]
+		public JsonElement? Extensions { get; set; }
 
 		public override bool Equals(object? obj) => this.Equals(obj as GraphQLResponse<T>);
 
 		public bool Equals(GraphQLResponse<T>? other) {
 			if (other == null) { return false; }
 			if (ReferenceEquals(this, other)) { return true; }
-			if (!EqualityComparer<dynamic?>.Default.Equals(this.Data, other.Data)) { return false; }
+			if (!EqualityComparer<T>.Default.Equals(this.Data, other.Data)) { return false; }
 			{
 				if (this.Errors != null && other.Errors != null) {
 					if (!Enumerable.SequenceEqual(this.Errors, other.Errors)) { return false; }
@@ -25,13 +30,13 @@ public bool Equals(GraphQLResponse<T>? other) {
 				else if (this.Errors != null && other.Errors == null) { return false; }
 				else if (this.Errors == null && other.Errors != null) { return false; }
 			}
-			if (!EqualityComparer<IDictionary<string, dynamic>?>.Default.Equals(this.Extensions, other.Extensions)) { return false; }
+			if (!EqualityComparer<JsonElement?>.Default.Equals(this.Extensions, other.Extensions)) { return false; }
 			return true;
 		}
 
 		public override int GetHashCode() {
 			unchecked {
-				var hashCode = EqualityComparer<dynamic?>.Default.GetHashCode(this.Data);
+				var hashCode = EqualityComparer<T>.Default.GetHashCode(this.Data);
 				{
 					if (this.Errors != null) {
 						foreach (var element in this.Errors) {
@@ -42,7 +47,7 @@ public override int GetHashCode() {
 						hashCode = (hashCode * 397) ^ 0;
 					}
 				}
-				hashCode = (hashCode * 397) ^ EqualityComparer<IDictionary<string, dynamic>?>.Default.GetHashCode(this.Extensions);
+				hashCode = (hashCode * 397) ^ EqualityComparer<JsonElement?>.Default.GetHashCode(this.Extensions);
 				return hashCode;
 			}
 		}
diff --git a/src/GraphQL.Primitives/GraphQL.Primitives.csproj b/src/GraphQL.Primitives/GraphQL.Primitives.csproj
index ca03991d..aecb7aea 100644
--- a/src/GraphQL.Primitives/GraphQL.Primitives.csproj
+++ b/src/GraphQL.Primitives/GraphQL.Primitives.csproj
@@ -5,11 +5,11 @@
 	<PropertyGroup>
 		<Description>GraphQL basic types</Description>
 		<RootNamespace>GraphQL</RootNamespace>
-		<TargetFrameworks>netstandard1.0;netstandard2.0</TargetFrameworks>
+		<TargetFramework>netstandard2.0</TargetFramework>
 	</PropertyGroup>
 
 	<ItemGroup>
 		<PackageReference Include="Microsoft.CSharp" Version="4.7.0" />
+		<PackageReference Include="System.Text.Json" Version="4.7.0" />
 	</ItemGroup>
-
 </Project>
diff --git a/src/GraphQL.Primitives/GraphQLError.cs b/src/GraphQL.Primitives/GraphQLError.cs
index 6ccdd39c..82a80ddc 100644
--- a/src/GraphQL.Primitives/GraphQLError.cs
+++ b/src/GraphQL.Primitives/GraphQLError.cs
@@ -1,6 +1,8 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using System.Text.Json;
+using System.Text.Json.Serialization;
 
 namespace GraphQL {
 
@@ -11,23 +13,27 @@ public class GraphQLError : IEquatable<GraphQLError?> {
 
 		/// <summary>
 		/// The extensions of the error
-		/// </summary>
-		public IDictionary<string, dynamic?>? Extensions { get; set; }
+		/// </summary> 
+		[JsonPropertyName("extensions")]
+		public JsonElement? Extensions { get; set; }
 
 		/// <summary>
 		/// The locations of the error
 		/// </summary>
+		[JsonPropertyName("locations")]
 		public GraphQLLocation[]? Locations { get; set; }
 
 		/// <summary>
 		/// The message of the error
 		/// </summary>
+		[JsonPropertyName("message")]
 		public string Message { get; set; }
 
 		/// <summary>
 		/// The Path of the error
 		/// </summary>
-		public dynamic[]? Path { get; set; }
+		[JsonPropertyName("path")]
+		public object[]? Path { get; set; }
 
 		/// <summary>
 		/// Returns a value that indicates whether this instance is equal to a specified object
@@ -45,7 +51,7 @@ public override bool Equals(object? obj) =>
 		public bool Equals(GraphQLError? other) {
 			if (other == null) { return false; }
 			if (ReferenceEquals(this, other)) { return true; }
-			if (!EqualityComparer<IDictionary<string, dynamic?>?>.Default.Equals(this.Extensions, other.Extensions)) { return false; }
+			if (!EqualityComparer<JsonElement?>.Default.Equals(this.Extensions, other.Extensions)) { return false; }
 			{
 				if (this.Locations != null && other.Locations != null) {
 					if (!this.Locations.SequenceEqual(other.Locations)) { return false; }
@@ -70,7 +76,7 @@ public bool Equals(GraphQLError? other) {
 		public override int GetHashCode() {
 			var hashCode = 0;
 			if (this.Extensions != null) {
-				hashCode = hashCode ^ EqualityComparer<IDictionary<string, dynamic?>>.Default.GetHashCode(this.Extensions);
+				hashCode = hashCode ^ EqualityComparer<JsonElement?>.Default.GetHashCode(this.Extensions);
 			}
 			if (this.Locations != null) {
 				hashCode = hashCode ^ EqualityComparer<GraphQLLocation[]>.Default.GetHashCode(this.Locations);
diff --git a/src/GraphQL.Primitives/GraphQLRequest.cs b/src/GraphQL.Primitives/GraphQLRequest.cs
index dd8a180a..95bf8eae 100644
--- a/src/GraphQL.Primitives/GraphQLRequest.cs
+++ b/src/GraphQL.Primitives/GraphQLRequest.cs
@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.Text.Json.Serialization;
 
 namespace GraphQL {
 
@@ -11,16 +12,20 @@ public class GraphQLRequest : IEquatable<GraphQLRequest?> {
 		/// <summary>
 		/// The Query
 		/// </summary>
+		/// 
+		[JsonPropertyName("query")]
 		public string Query { get; set; }
 
 		/// <summary>
 		/// The name of the Operation
 		/// </summary>
+		[JsonPropertyName("operationName")]
 		public string? OperationName { get; set; }
 
 		/// <summary>
 		/// Represents the request variables
 		/// </summary>
+		[JsonPropertyName("variables")]
 		public virtual object? Variables { get; set; }
 
 
diff --git a/tests/GraphQL.Client.Http.Tests/GraphQL.Client.Http.Tests.csproj b/tests/GraphQL.Client.Http.Tests/GraphQL.Client.Http.Tests.csproj
index 64ce8f5e..c0b659da 100644
--- a/tests/GraphQL.Client.Http.Tests/GraphQL.Client.Http.Tests.csproj
+++ b/tests/GraphQL.Client.Http.Tests/GraphQL.Client.Http.Tests.csproj
@@ -7,6 +7,7 @@
 	</PropertyGroup>
 
     <ItemGroup>
+		<PackageReference Include="FluentAssertions" Version="5.10.0" />
 		<PackageReference Include="Microsoft.AspNetCore.TestHost" Version="3.1.0" />
     </ItemGroup>
 
diff --git a/tests/GraphQL.Client.Http.Tests/JsonSerializationTests.cs b/tests/GraphQL.Client.Http.Tests/JsonSerializationTests.cs
index 1f12cff5..74191b15 100644
--- a/tests/GraphQL.Client.Http.Tests/JsonSerializationTests.cs
+++ b/tests/GraphQL.Client.Http.Tests/JsonSerializationTests.cs
@@ -1,5 +1,7 @@
+using System.Collections.Generic;
 using Xunit;
 using System.Text.Json;
+using FluentAssertions;
 
 namespace GraphQL.Client.Http.Tests {
 	public class JsonSerializationTests {
@@ -9,7 +11,9 @@ public void WebSocketResponseDeserialization() {
 			var testObject = new ExtendedTestObject { Id = "test", OtherData = "this is some other stuff" };
 			var json = JsonSerializer.Serialize(testObject);
 			var deserialized = JsonSerializer.Deserialize<TestObject>(json);
-
+			var dict = JsonSerializer.Deserialize<Dictionary<string, object>>(json);
+			var childObject = (JsonElement) dict["ChildObject"];
+			childObject.GetProperty("Id").GetString().Should().Be(testObject.ChildObject.Id);
 		}
 
 		public class TestObject {
@@ -19,6 +23,8 @@ public class TestObject {
 
 		public class ExtendedTestObject : TestObject {
 			public string OtherData { get; set; }
+
+			public TestObject ChildObject{ get; set; } = new TestObject {Id = "1337"};
 		}
 	}
 }
diff --git a/tests/GraphQL.Integration.Tests/ExtensionsTest.cs b/tests/GraphQL.Integration.Tests/ExtensionsTest.cs
new file mode 100644
index 00000000..f3dfa126
--- /dev/null
+++ b/tests/GraphQL.Integration.Tests/ExtensionsTest.cs
@@ -0,0 +1,74 @@
+using System;
+using System.Collections.Generic;
+using System.Text.Json;
+using Dahomey.Json;
+using FluentAssertions;
+using GraphQL.Client;
+using GraphQL.Integration.Tests.Extensions;
+using GraphQL.Integration.Tests.Helpers;
+using IntegrationTestServer;
+using IntegrationTestServer.ChatSchema;
+using Xunit;
+
+namespace GraphQL.Integration.Tests {
+	public class ExtensionsTest {
+		private static TestServerSetup SetupTest(bool requestsViaWebsocket = false) =>
+			WebHostHelpers.SetupTest<StartupChat>(requestsViaWebsocket);
+
+		[Fact]
+		public async void CanDeserializeExtensions() {
+
+			using var setup = SetupTest();
+			var response = await setup.Client.SendQueryAsync(new GraphQLRequest("query { extensionsTest }"),
+					() => new {extensionsTest = ""})
+				.ConfigureAwait(false);
+
+			response.Errors.Should().NotBeNull();
+			response.Errors.Should().ContainSingle();
+			response.Errors[0].Extensions.Should().NotBeNull();
+
+			JsonElement data = new JsonElement();
+			response.Errors[0].Extensions.Value.Invoking(element => data = element.GetProperty("data")).Should()
+				.NotThrow();
+
+			foreach (var item in ChatQuery.TestExtensions) {
+				JsonElement value = new JsonElement();
+				data.Invoking(element => value = element.GetProperty(item.Key)).Should().NotThrow();
+
+				switch (item.Value) {
+					case int i:
+						value.GetInt32().Should().Be(i);
+						break;
+					default:
+						value.GetString().Should().BeEquivalentTo(item.Value.ToString());
+						break;
+				}
+			}
+		}
+
+		[Fact]
+		public async void DontNeedToUseCamelCaseNamingStrategy() {
+
+			using var setup = SetupTest();
+			setup.Client.Options.JsonSerializerOptions = new JsonSerializerOptions().SetupExtensions();
+
+			const string message = "some random testing message";
+			var graphQLRequest = new GraphQLRequest(
+				@"mutation($input: MessageInputType){
+				  addMessage(message: $input){
+				    content
+				  }
+				}",
+				new {
+					input = new {
+						fromId = "2",
+						content = message,
+						sentAt = DateTime.Now
+					}
+				});
+			var response = await setup.Client.SendMutationAsync(graphQLRequest, () => new { addMessage = new { content = "" } });
+
+			Assert.Equal(message, response.Data.addMessage.content);
+		}
+	}
+}
diff --git a/tests/GraphQL.Integration.Tests/GraphQL.Integration.Tests.csproj b/tests/GraphQL.Integration.Tests/GraphQL.Integration.Tests.csproj
index de5a92ca..aaf21a67 100644
--- a/tests/GraphQL.Integration.Tests/GraphQL.Integration.Tests.csproj
+++ b/tests/GraphQL.Integration.Tests/GraphQL.Integration.Tests.csproj
@@ -7,6 +7,7 @@
   </PropertyGroup>
 
   <ItemGroup>
+    <PackageReference Include="FluentAssertions" Version="5.10.0" />
     <PackageReference Include="Microsoft.AspNetCore.Mvc.Testing" Version="3.1.1" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.4.0" />
     <PackageReference Include="NETStandard.Library" Version="2.0.3" />
diff --git a/tests/GraphQL.Integration.Tests/QueryAndMutationTests.cs b/tests/GraphQL.Integration.Tests/QueryAndMutationTests.cs
index 64ec475a..ca81340f 100644
--- a/tests/GraphQL.Integration.Tests/QueryAndMutationTests.cs
+++ b/tests/GraphQL.Integration.Tests/QueryAndMutationTests.cs
@@ -1,4 +1,5 @@
 using System.Net.Http;
+using System.Text.Json;
 using GraphQL.Client;
 using GraphQL.Client.Http;
 using GraphQL.Integration.Tests.Helpers;
@@ -25,6 +26,20 @@ public async void QueryTheory(int id, string name) {
 			}
 		}
 
+		[Theory]
+		[ClassData(typeof(StarWarsHumans))]
+		public async void QueryWithJsonElementAsReturnTypeTheory(int id, string name) {
+			var graphQLRequest = new GraphQLRequest($"{{ human(id: \"{id}\") {{ name }} }}");
+
+			using (var setup = SetupTest()) {
+				var response = await setup.Client.SendQueryAsync<JsonElement>(graphQLRequest)
+					.ConfigureAwait(false);
+
+				Assert.Null(response.Errors);
+				Assert.Equal(name, response.Data.GetProperty("human").GetProperty("name").GetString());
+			}
+		}
+
 		[Theory]
 		[ClassData(typeof(StarWarsHumans))]
 		public async void QueryWitVarsTheory(int id, string name) {
diff --git a/tests/IntegrationTestServer/ChatSchema/CapitalizedFieldsGraphType.cs b/tests/IntegrationTestServer/ChatSchema/CapitalizedFieldsGraphType.cs
new file mode 100644
index 00000000..32b235e5
--- /dev/null
+++ b/tests/IntegrationTestServer/ChatSchema/CapitalizedFieldsGraphType.cs
@@ -0,0 +1,18 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Reflection.Metadata.Ecma335;
+using System.Threading.Tasks;
+using GraphQL.Types;
+
+namespace IntegrationTestServer.ChatSchema {
+	public class CapitalizedFieldsGraphType: ObjectGraphType {
+		public CapitalizedFieldsGraphType() {
+			Name = "CapitalizedFields";
+
+			Field<StringGraphType>()
+				.Name("StringField")
+				.Resolve(context => "hello world");
+		}
+	}
+}
diff --git a/tests/IntegrationTestServer/ChatSchema/ChatQuery.cs b/tests/IntegrationTestServer/ChatSchema/ChatQuery.cs
index 6620c19c..8b423f95 100644
--- a/tests/IntegrationTestServer/ChatSchema/ChatQuery.cs
+++ b/tests/IntegrationTestServer/ChatSchema/ChatQuery.cs
@@ -1,10 +1,27 @@
+using System.Collections.Generic;
 using System.Linq;
+using GraphQL;
 using GraphQL.Types;
 
 namespace IntegrationTestServer.ChatSchema {
 	public class ChatQuery : ObjectGraphType {
+
+		public static readonly Dictionary<string, object> TestExtensions = new Dictionary<string, object> {
+			{"extension1", "hello world"},
+			{"another extension", 4711}
+		};
+
 		public ChatQuery(IChat chat) {
+			Name = "ChatQuery";
+
 			Field<ListGraphType<MessageType>>("messages", resolve: context => chat.AllMessages.Take(100));
+
+			Field<StringGraphType>()
+				.Name("extensionsTest")
+				.Resolve(context => {
+					context.Errors.Add(new ExecutionError("this error contains extension fields", TestExtensions));
+					return null;
+				});
 		}
 	}
 }