Javascript JSON Parse and Stringify with Examples

JSON stands for Javascript Object Notation. It is a lightweight language-independent data interchange format.

A common use of JSON is to exchange data to/from a web server. When sending data to a server, you need to send it as a JSON string. And when you’re receiving JSON data from a server, you would need to parse it to a Javascript object.

Javascript has two functions namely JSON.stringify() and JSON.parse() to convert a Javascript object to json string and vice versa. Let’s look at how these functions work:

JSON.stringify(): Convert Javascript object to JSON

var user = {
  name: "Rajeev Singh",
  age: 26,
  address: {
    city: "Bangalore",
    State: "Karnataka",
    Country: "India"
  },
  hobbies: ["Coding", "Travelling", "Photography"]
};

var jsonData = JSON.stringify(user);
console.log(jsonData);
# Output
{"name":"Rajeev Singh","age":26,"address":{"city":"Bangalore","State":"Karnataka","Country":"India"},"hobbies":["Coding","Travelling","Photography"]}

JSON.parse(): Parse a JSON string

var jsonData = `
{
   "name": "Sachin Tendulkar",
   "age": 26,
   "address": {
      "city": "Mumbai",
      "State": "Maharastra",
      "Country": "India"
   },
   "hobbies": [
      "Cricket",
      "Badminton"
   ]
}
`;

var user = JSON.parse(jsonData);
console.log(user);
# Output
{
  name: "Sachin Tendulkar",
  age: 26,
  address: { city: "Mumbai", State: "Maharastra", Country: "India" },
  hobbies: [ "Cricket", "Badminton" ]
}