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Programming language: Go
License: MIT License
Tags: Query Language    
Latest version: v0.7.9

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README

graphql CircleCI Go Reference Coverage Status Join the chat at https://gitter.im/graphql-go/graphql

An implementation of GraphQL in Go. Follows the official reference implementation graphql-js.

Supports: queries, mutations & subscriptions.

Documentation

godoc: https://pkg.go.dev/github.com/graphql-go/graphql

Getting Started

To install the library, run:

go get github.com/graphql-go/graphql

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 (
    "encoding/json"
    "fmt"
    "log"

    "github.com/graphql-go/graphql"
)

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 := `
        {
            hello
        }
    `
    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.

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.
dataloader Nick Randall DataLoader implementation in Go.

Blog Posts