The third argument of

JSON.stringify(value, replacer, space)

is the number of spaces to use for pretty formatting

let user = {
  name: "John",
  age: 25,
  roles: {
    isAdmin: false,
    isEditor: true
  }
};

document.write('<pre>' + JSON.stringify(user, null, 8) + '</pre>');

It’s fine if we want to send an object over a network. The

space

argument is used exclusively for a nice output. Note: max value of space parameter is

20

The result of the above code:

{
        "name": "John",
        "age": 25,
        "roles": {
                "isAdmin": false,
                "isEditor": true
        }
}

It has 8 spaces for each TAB