go sample: how to convert Struct to map or json and vice versa

struct-sample.go

package main

import (
	"encoding/json"
	"fmt"
)

type MyStruct struct {
	Id           string `json:"id"`
	Name         string `json:"name"`
	UserId       string `json:"user_id"`
	CreatedAt    int64  `json:"created_at"`
}

func (c *MyStruct) ToMAP() (res map[string]interface{}){
	a, err := json.Marshal(c)
	if err != nil {
		panic(err)
	}
	json.Unmarshal(a, &res)
	return
}

func (c *MyStruct)LoadFromMap(m map[string]interface{})  error{
	data, err := json.Marshal(m)
	if err == nil{
		err = json.Unmarshal(data, c)
	}
	return err
}

func (c *MyStruct) ToJSON() string {
	a, err := json.Marshal(c)
	if err != nil {
		panic(err)
	}
	return string(a)
}

func (c *MyStruct)LoadFromJSON(jsonStr string)  error{
	err := json.Unmarshal([]byte(jsonStr), c)
	return err
}

func (c *MyStruct)ToByte()  ([]byte, error){
	return json.Marshal(c)
}

func (c *MyStruct)LoadFromByte(data []byte)  error{
	return json.Unmarshal(data, c)
}

func main() {
	s1 := MyStruct{
		Id: "2",
		Name:"jack",
		UserId: "123",
		CreatedAt: 5,
	}
	fmt.Println("struct to byte:")
	fmt.Println(s1.ToByte())
	fmt.Println()
	fmt.Println("struct to map[string]interface{}:")
	fmt.Println(s1.ToMAP())
	fmt.Println()
	fmt.Println("struct to string json: ")
	fmt.Println(s1.ToJSON())
	fmt.Println()

	///////////////////////////////////////
	///////////////////////////////////////
	// load from map
	fmt.Println("here, sample of load from map:")

	m := map[string]interface{}{
		"id": "3",
		"name": "Steve",
		"user_id": "114",
		"created_at": 5,
	}
	s2 := MyStruct{}
	s2.LoadFromMap(m)
	fmt.Println(s2)

	///////////////////////////////////////
	///////////////////////////////////////
	// load from json string
	fmt.Println("here, sample of load from json string:")
	jsonStr := "{\"id\":\"4\",\"name\":\"james\",\"user_id\":\"125\",\"created_at\":5}"
	s3 := MyStruct{}
	s3.LoadFromJSON(jsonStr)
	fmt.Println(s3)

}