json: unsupported type: map[interface {}]interface{}

// error:
// json: unsupported type: map[interface {}]interface{}

// solution:

// to be replaced
// https://github.com/json-iterator/go
// import "encoding/json"
// json.Marshal(&data)

// new
import jsoniter "github.com/json-iterator/go"
var json = jsoniter.ConfigCompatibleWithStandardLibrary
json.Marshal(&data)
