JSON String ↔ JavaScript Object

let user = {
    id: 1,
    username: "ssar",
    password: "1234",
    hobby: ["축구", "농구"]
};

// js object -> json string
let requestBody = JSON.stringify(user);
console.log(requestBody);

// json string -> js object
let responseBody = JSON.parse(requestBody);
console.log(responseBody);