JSON.stringify()

JSON is used for data exchange with web servers. When sending data to a web server, the data must be a string.

The JSON.stringify() method converts JavaScript objects or values to JSON strings.

If the method optionally replaces valuesSubstituteSpecified or optional if only including specified properties functionSubstituteSpecify an array.

Syntax:

JSON.stringify(value, replacer)

The first parameter specifies the value to be converted to a JSON string.

An optional second parameter specifies a function that can change the behavior of the stringification process.

Convert JavaScript object to string

Suppose we have the following object in JavaScript:

　　var myObj = {name: "Seagull", age:　22, city: "New Delhi"};

Using the JSON.stringify() method, we can convert a JavaScript object to a JSON string:

var myJSON = JSON.stringify(myObj);

Convert JavaScript array to string

Suppose we have the following array in JavaScript:

　　var myArr = ["Seagull", "Cynthia", "Tarush"];

Using the JSON.stringify() method, we can convert a JavaScript array to a JSON string:

var myJSON = JSON.stringify(myArr);

Convert date objects to strings

Date objects are not allowed in JSON.

The JSON.stringify() method will convert any date object to a string.

var myObj = { name: "Seagull", today: new Date(), city: "New Delhi" };
var myJSON = JSON.stringify(myObj);
document.getElementById("output").innerHTML = myJSON;

Note: Converting a string to a local object is calledParsing, while converting a local object to a format that can be transmitted over the networkStringis calledStringification.