Json scalar implementation for github.com/graph-gophers/graphql-go

golang_graphql_json_scalar.go

package graphql

import (
	"encoding/json"
)

type Json map[string]interface{}

func (Json) ImplementsGraphQLType(name string) bool {
	return name == "Json"
}

func (m *Json) UnmarshalGraphQL(input interface{}) error {
	var bytes []byte
	switch input.(type) {
	case []byte:
		bytes = input.([]byte)
	default:
		var err error
		bytes, err = json.Marshal(input)
		if err != nil {
			return err
		}
	}

	return json.Unmarshal(bytes, m)
}

How to use it:

func (r *CollectionResolver) Data() (*graphql.Json, error) {
	result := &graphql.Json{}
	err := result.UnmarshalGraphQL(map[string]interface{}{
		"a": map[string]interface{}{
			"b": map[string]interface{}{
				"c": "d",
			},
		},
	})
	if err != nil {
		return nil, err
	}
	return result, nil
}