An implementation of GraphQL for Go / Golang

go get


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A work-in-progress implementation of GraphQL for Go.

Getting Started

To install the library, run:

go get

The following is a simple example which defines a schema with a single hello string-type field and a Resolve method which returns the string world. A GraphQL query is performed against this schema with the resulting output printed in JSON format.

package main

import (


func main() {
    // Schema
    fields := graphql.Fields{
        "hello": &graphql.Field{
            Type: graphql.String,
            Resolve: func(p graphql.ResolveParams) (interface{}, error) {
                return "world", nil
    rootQuery := graphql.ObjectConfig{Name: "RootQuery", Fields: fields}
    schemaConfig := graphql.SchemaConfig{Query: graphql.NewObject(rootQuery)}
    schema, err := graphql.NewSchema(schemaConfig)
    if err != nil {
        log.Fatalf("failed to create new schema, error: %v", err)

    // Query
    query := `
    params := graphql.Params{Schema: schema, RequestString: query}
    r := graphql.Do(params)
    if len(r.Errors) > 0 {
        log.Fatalf("failed to execute graphql operation, errors: %+v", r.Errors)
    rJSON, _ := json.Marshal(r)
    fmt.Printf("%s \n", rJSON) // {“data”:{“hello”:”world”}}

For more complex examples, refer to the examples/ directory and graphql_test.go.

Origin and Current Direction

This project was originally a port of v0.4.3 of graphql-js (excluding the Validator), which was based on the July 2015 GraphQL specification. graphql is currently several versions behind graphql-js, however future efforts will be guided directly by the latest formal GraphQL specification (currently: October 2015).

Third Party Libraries

Name Author Description
graphql-go-handler Hafiz Ismail Middleware to handle GraphQL queries through HTTP requests.
graphql-relay-go Hafiz Ismail Lib to construct a graphql-go server supporting react-relay.
golang-relay-starter-kit Hafiz Ismail Barebones starting point for a Relay application with Golang GraphQL server.

Blog Posts


  • Lexer
  • Parser
  • Schema Parser
  • Printer
  • Schema Printer
  • Visitor
  • Executor
  • Validator
  • Examples
    • Basic Usage (see: PR-#21)
    • React/Relay
  • Alpha Release (v0.1)