JavaScript JSON stringify() Method
Example
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.
| Method | |||||
|---|---|---|---|---|---|
| stringify() | 4.0 | 8.0 | 3.5 | 4.0 | 11.5 |
Syntax
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
Example
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;
}
});
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Example
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);
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Example
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
❮ JavaScript JSON Object
