coba GraphQL : https://github.com/graphql-go/graphql

cobaGraphQL.go

package main

import (
	"encoding/json"
	"log"
	"net/http"

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

func main() {
	// Schema
	fields := graphql.Fields{
		"hello": &graphql.Field{
			Type: graphql.String,
			Args: graphql.FieldConfigArgument{
				"param1": &graphql.ArgumentConfig{
					Type: graphql.String,
				},
			},
			Resolve: func(p graphql.ResolveParams) (interface{}, error) {
				return p.Args["param1"], 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)
	}

	http.ListenAndServe(":8080", http.HandlerFunc(func(hrw http.ResponseWriter, hr *http.Request) {
		// Query
		query := hr.URL.Query()
		if len(query) == 0 {
			hrw.Header().Set("Content-Type", "text/html; charset=utf-8")
			hrw.Write([]byte(`<a href='/?query={ hello(param1: "world") }'>hello</a>`))
			return
		}
		for k, v := range query {
			switch k {
			case "query":
				params := graphql.Params{Schema: schema, RequestString: v[0]}
				r := graphql.Do(params)
				if len(r.Errors) > 0 {
					log.Fatalf("failed to execute graphql operation, errors: %+v", r.Errors)
				}
				hrw.Header().Set("Content-Type", "application/json")
				json.NewEncoder(hrw).Encode(r)
			default:
				hrw.WriteHeader(http.StatusNotFound)
				hrw.Write([]byte("resource not found"))
			}
			return
		}
	}))
}

screenshot.md