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A GraphQL Client for .NET Standard over HTTP.

Provides the following packages:

Package Downloads Nuget Latest
GraphQL.Client Nuget Nuget
GraphQL.Client.Abstractions Nuget Nuget
GraphQL.Client.Abstractions.Websocket Nuget Nuget
GraphQL.Client.LocalExecution Nuget Nuget
GraphQL.Client.Serializer.Newtonsoft Nuget Nuget
GraphQL.Client.Serializer.SystemTextJson Nuget Nuget
GraphQL.Primitives Nuget Nuget


The Library will try to follow the following standards and documents:


Create a GraphQLHttpClient

// To use NewtonsoftJsonSerializer, add a reference to NuGet package GraphQL.Client.Serializer.Newtonsoft
var graphQLClient = new GraphQLHttpClient("", new NewtonsoftJsonSerializer());

Create a GraphQLRequest:

Simple Request:

var heroRequest = new GraphQLRequest {
    Query = @"
        hero {

OperationName and Variables Request:

var personAndFilmsRequest = new GraphQLRequest {
    Query =@"
    query PersonAndFilms($id: ID) {
        person(id: $id) {
            filmConnection {
                films {
    OperationName = "PersonAndFilms",
    Variables = new {
        id = "cGVvcGxlOjE="

Be careful when using byte[] in your variables object, as most JSON serializers will treat that as binary data! If you really need to send a list of bytes with a byte[] as a source, then convert it to a List<byte> first, which will tell the serializer to output a list of numbers instead of a base64-encoded string.

Execute Query/Mutation:

public class ResponseType 
    public PersonType Person { get; set; }

public class PersonType 
    public string Name { get; set; }
    public FilmConnectionType FilmConnection { get; set; }    

public class FilmConnectionType {
    public List<FilmContentType> Films { get; set; }    

public class FilmContentType {
    public string Title { get; set; }

var graphQLResponse = await graphQLClient.SendQueryAsync<ResponseType>(personAndFilmsRequest);

var personName = graphQLResponse.Data.Person.Name;

Using the extension method for anonymously typed responses (namespace GraphQL.Client.Abstractions) you could achieve the same result with the following code:

var graphQLResponse = await graphQLClient.SendQueryAsync(personAndFilmsRequest, () => new { person = new PersonType()} );
var personName = graphQLResponse.Data.person.Name;

Use Subscriptions

public class UserJoinedSubscriptionResult {
    public ChatUser UserJoined { get; set; }

    public class ChatUser {
        public string DisplayName { get; set; }
        public string Id { get; set; }

Create subscription

var userJoinedRequest = new GraphQLRequest {
    Query = @"
    subscription {

IObservable<GraphQLResponse<UserJoinedSubscriptionResult>> subscriptionStream 
    = client.CreateSubscriptionStream<UserJoinedSubscriptionResult>(userJoinedRequest);

var subscription = subscriptionStream.Subscribe(response => 
        Console.WriteLine($"user '{response.Data.UserJoined.DisplayName}' joined")

End Subscription


Useful Links:

Blazor WebAssembly Limitations

Blazor WebAssembly differs from other platforms as it does not support all features of other .NET runtime implementations. For instance, the following WebSocket options properties are not supported and will not be set: