How to using json parser in golang

json_example.go

package main

import (
	"encoding/json"
	"fmt"
	"time"
)

// The custom time format for json
type MyTime time.Time

var myTimeFormat string = "2006-01-02 15:04:05 -0700 MST"

func (t MyTime) MarshalJSON() ([]byte, error) {
	return []byte(time.Time(t).Format(`"` + myTimeFormat + `"`)), nil
}

func (t *MyTime) UnmarshalJSON(data []byte) (err error) {
	ti, err := time.Parse(`"`+myTimeFormat+`"`, string(data))
	*t = MyTime(ti)
	return
}

func (t MyTime) String() string {
	return time.Time(t).String()
}

type foobar struct {
	// Simple type
	Integer int `json:"integer"`

	// The fieldname is case insensitive
	String string

	// Field not exists should be fine
	Foobar int

	// Time format, default RFC3339 format
	CurrentTime time.Time `json:"current_time"`

	// Can parse other format
	LastTime MyTime `json:"last_time"`

	// Closure should be fine
	Closure struct {
		Someting string `json:"something"`
		Closure  struct {
			SomeNumber int `json:"some_number"`
		} `json:"closure"`
	} `json:"closure"`
}

func main() {
	str := `{
		"integer": 3,
		"string": "Some String",

		"current_time": "2015-03-13T16:14:45Z",
		"last_time": "2015-03-13 16:14:45 +0000 UTC",

		"closure": {
			"something": "something foo bar",
			"closure": {
				"some_number": 123
			}
		}
	}`

	var f foobar
	err := json.Unmarshal([]byte(str), &f)

	fmt.Println(err)
	fmt.Println(f)

	newStr, err := json.Marshal(&f)
	fmt.Println(string(newStr))
}