Concept

JSON (JavaScript Object Notation) is a popular data format used for transmitting and storing data. In JavaScript, we can use JSON to represent and work with objects and arrays.

Format

JSON is a simple and easy-to-read data format, represented by key-value pairs. Data in JSON is described by basic data types such as number, string, object, array, boolean, and null. Here is an example of JSON format:

{
  "name": "John",
  "age": 25,
  "city": "New York"
}

In the example above, we have three fields: name, age, and city. Each field is enclosed in double quotes "" and separated by a colon :. The fields are separated by a comma ,.

Convert from JavaScript object to JSON

To convert from a JavaScript object to JSON, we can use the JSON.stringify() method.

var person = {
  name: "John",
  age: 25,
  city: "New York"
};

var jsonPerson = JSON.stringify(person);
console.log(jsonPerson);

Result:

{"name":"John","age":25,"city":"New York"}

Convert from JSON to JavaScript object

To convert from JSON to a JavaScript object, we can use the JSON.parse() method.

var jsonPerson = '{"name":"John","age":25,"city":"New York"}';

var person = JSON.parse(jsonPerson);
console.log(person.name);
console.log(person.age);
console.log(person.city);

Result:

John
25
New York