JSON.stringify

Learn to convert an object into a JSON string with JSON.stringify.

Turning an object into text

To convert a JavaScript object into a text format, use the built-in stringify method. Pass the object as a parameter; the method returns a text string.

const user = { name: 'Alex' };
const text = stringify(user);
// text === '{"name": "Alex"}'

The returned text can be used anywhere: written to a file, sent to a server or saved in storage.

Readable text with indentation

If you pass a number as the third parameter to stringify, the result is indented. This makes the data easier for humans to read.

const text = stringify(user, null, 2);

The second parameter is a replacer function or a list of keys; pass null if you do not need it. Indentation is only for display; it does not matter when you parse the data back.

Exercise Turn the object into text

Turn the settings object into text and assign it to text. Use the built-in stringify method.

Show example solution

Call stringify with settings.
Example solution:
const text = stringify(settings);

Test yourself

What does stringify({a: 1}) return?
```
stringify({a: 1})
```
- An object
- A number
- null
- A string
Show answer

A string — Correct! stringify turns an object into a string.

Produce indented text

const text = stringify(user, ____, 2);

Show answer

const text = stringify(user, null, 2);

Match methods to their job

stringify

object to text
parse

text to object
trim

trims string edges
join

joins an array

Next lesson: structuredClone

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