Try It Yourself - SyntaxStudy Editor

HTML / CSS / JS

package main

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

type Address struct {
    Street string `json:"street"`
    City   string `json:"city"`
    Zip    string `json:"zip,omitempty"`
}

type User struct {
    ID        int       `json:"id"`
    Username  string    `json:"username"`
    Email     string    `json:"email"`
    Password  string    `json:"-"`           // never serialised
    Address   Address   `json:"address"`
    CreatedAt time.Time `json:"created_at"`
    Score     *float64  `json:"score,omitempty"`
}

func main() {
    u := User{
        ID:        1,
        Username:  "gopher",
        Email:     "gopher@example.com",
        Password:  "secret",
        Address:   Address{Street: "1 Main St", City: "Springfield"},
        CreatedAt: time.Now(),
    }

// Marshal to JSON
    data, err := json.MarshalIndent(u, "", "  ")
    if err != nil {
        log.Fatal(err)
    }
    fmt.Println(string(data))

// Unmarshal from JSON
    raw := `{"id":2,"username":"alice","email":"alice@example.com","address":{"street":"2 Elm St","city":"Shelbyville","zip":"12345"},"created_at":"2024-01-01T00:00:00Z"}`
    var u2 User
    if err := json.Unmarshal([]byte(raw), &u2); err != nil {
        log.Fatal(err)
    }
    fmt.Printf("Decoded: %+v
", u2)
}