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JavaScript JSON stringify() Method


Stringify a JavaScript object:

var obj = { "name":"John", "age":30, "city":"New York"};
var myJSON = JSON.stringify(obj);
document.getElementById("demo").innerHTML = myJSON;
Try it Yourself »

More "Try it Yourself" examples below.

Definition and Usage

The JSON.stringify() method converts JavaScript objects into strings.

When sending data to a web server the data has to be a string.

Browser Support

The numbers in the table specify the first browser version that fully supports the method.

stringify() 4.0 8.0 3.5 4.0 11.5


JSON.stringify(obj, replacer, space)

Parameter Values

Parameter Description
obj Required. The value to convert to a string
replacer Optional. Either a function or an array used to transform the result. The replacer is called for each item.
space Optional. Either a String or a Number.
A string to be used as white space (max 10 characters),
or a Number, from 0 to 10, to indicate how many space characters to use as white space.

Technical Details

Return Value: A String
JavaScript Version: ECMAScript 5

More Examples


Using the replacer function:

/*replace the value of "city" to upper case:*/
var obj = { "name":"John", "age":"39", "city":"New York"};
var text = JSON.stringify(obj, function (key, value) {
  if (key == "city") {
    return value.toUpperCase();
  } else {
    return value;
Try it Yourself »


Using the space parameter:

/*Insert 10 space characters for each white space:*/
var obj = { "name":"John", "age":"39", "city":"New York"};
var text = JSON.stringify(obj, null, 10);
Try it Yourself »


Using the space parameter:

/*Insert the word SPACE for each white space:*/
var obj = { "name":"John", "age":"39", "city":"New York"};
var text = JSON.stringify(obj, null, "SPACE");
Try it Yourself »

Related Pages

JSON Tutorial: JSON Introduction