How to parse JSON

Stdlib

2026-04-17T12:05:42+00:00

Parse JSON in Go using the encoding/json package's Unmarshal function to convert data into native variables.

Use the encoding/json package's json.Unmarshal function to convert JSON data into Go variables. Pass a byte slice of the JSON and a pointer to the target variable to populate it directly.

package main

import (
	"encoding/json"
	"fmt"
)

type User struct {
	Name string `json:"name"`
	Age  int    `json:"age"`
}

func main() {
	jsonData := []byte(`{"name":"Alice","age":30}`)
	var u User
	err := json.Unmarshal(jsonData, &u)
	if err != nil {
		panic(err)
	}
	fmt.Println(u.Name, u.Age)
}