json unmarshal test

main.go

package main

import (
	"encoding/json"
	"fmt"

	scan "github.com/mattn/go-scan"
)

type User struct {
	Name string
	Age  uint16
}

func (u *User) UnmarshalJSON(data []byte) error {
	var i interface{}

	if err := json.Unmarshal(data, &i); err != nil {
		return err
	}
	if err := scan.ScanTree(i, "/Name", &u.Name); err != nil {
		return err
	}
	if err := scan.ScanTree(i, "/Age", &u.Age); err != nil {
		return err
	}
	return nil
}

func main() {
	var jsonStr = `{"Name": "Ken", "Age": 32}`
	var u User
	err := json.Unmarshal([]byte(jsonStr), &u)
	if err != nil {
		panic(err)
	}
	fmt.Printf("Name: %s Age: %d\n", u.Name, u.Age)
}