---
title: JSON Stringify
description: "> A common use of JSON is to exchange data to/from a web server. > > > > When sending data to a web server, the data has to be a string. > > > > Convert a JavaScript object…"
url: "https://apprentice.mn/docs/json-stringify/"
updated: "2021-05-19"
category: Javascript
---

# JSON Stringify

> A common use of JSON is to exchange data to/from a web server.
>
>
>
> When sending data to a web server, the data has to be a string.
>
>
>
> Convert a JavaScript object into a string with `JSON.stringify()`.

## Stringify a JavaScript Object

Imagine we have this object in JavaScript:

     `var obj = { name: "John", age: 30, city: "New York" };`

 

Use the JavaScript function `JSON.stringify()` to convert it into a string.

     `var myJSON = JSON.stringify(obj);`

`myJSON` is now a string, and ready to be sent to a server:

### Example

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

You will learn how to send JSON to the server in the next chapter.

## Stringify a JavaScript Array

It is also possible to stringify JavaScript arrays:

Imagine we have this array in JavaScript:

     `var arr = [ "John", "Peter", "Sally", "Jane" ];`

Use the JavaScript function `JSON.stringify()` to convert it into a string.

     `var myJSON = JSON.stringify(arr);`

The result will be a string following the JSON notation.

 

`myJSON` is now a string, and ready to be sent to a server:

### Example

       `var arr = [ "John", "Peter", "Sally", "Jane" ];
var myJSON = JSON.stringify(arr);
document.getElementById("demo").innerHTML = myJSON;`

You will learn how to send JSON to the server in the next chapter.

## Exceptions

### Stringify Dates

In JSON, date objects are not allowed. The `JSON.stringify()` function will convert any dates into strings.

### Example

              `var obj = { name: "John", today: new Date(), city : "New York" };
var myJSON = JSON.stringify(obj);

document.getElementById("demo").innerHTML = myJSON;`

You can convert the string back into a date object at the receiver.

### Stringify Functions

In JSON, functions are not allowed as object values.

The `JSON.stringify()` function will remove any functions from a JavaScript object, both the key and the value:

### Example

              `var obj = { name: "John", age: function () {return 30;}, city: "New York"};
var myJSON = JSON.stringify(obj);

document.getElementById("demo").innerHTML = myJSON;`

This can be omitted if you convert your functions into strings before running the `JSON.stringify()` function.

### Example

              `var obj = { name: "John", age: function () {return 30;}, city: "New York" };
obj.age = obj.age.toString();
var myJSON = JSON.stringify(obj);

document.getElementById("demo").innerHTML = myJSON;`

If you send functions using JSON, the functions will lose their scope, and the receiver would have to use eval() to convert them back into functions.

## Browser Support

The `JSON.stringify()` function is included in JavaScript (ECMAScript) and is supported in all major browsers.

| chrome | internet explorer | Mozila firefox | Safari | Opera |
| --- | --- | --- | --- | --- |
| Yes | 8.0 | 3.5 | 4.0 | 10.0 |

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