Convert Object to JSON String in JavaScript

var student = {
    id: 'st01',
    name: 'Name 1',
    age: 20,
    address: {
        street: 'street 1',
        ward: 'ward 1'
    }
}
var str = JSON.stringify(student);
console.log(str);

Output

{"id":"st01","name":"Name 1","age":20,"address":{"street":"street 1","ward":"ward 1"}}