A plain-text data format built from key/value pairs and arrays. It is the default response format for most modern web APIs.

No. Formatting happens entirely in your browser with JavaScript — nothing is sent to a server, logged, or stored.

Why does my JSON fail to parse?

The usual causes are trailing commas, single quotes instead of double quotes, or unquoted keys. The error message points at the exact position so you can fix it fast.

Free tool

JSON Formatter

Beautify, minify and validate JSON instantly.

Beautify, minify and validate JSON instantly. JSON Formatter runs completely inside your browser, so it is instant, private and free to use as often as you like — no account, no upload, no waiting.

JSON input

Features

Runs 100% in your browser — your data never leaves your device
Instant results with no sign-up, install or usage limit
Works on mobile, tablet and desktop
Copy or download the result in one tap

How to use JSON Formatter

1Open JSON Formatter and enter or upload your input above.
2Adjust the available options until the result matches what you need.
3Review the output, then copy or download it.

What is JSON?

JSON (JavaScript Object Notation) is a lightweight text format for exchanging structured data. It stores values as key/value pairs and ordered lists, which makes it readable for people and easy for every programming language to parse. Almost every web API today answers in JSON.

Why use JSON Formatter?

Most alternatives ask you to register, queue your file on a server, or bury the result under adverts. JSON Formatter loads in under a second, keeps your input on your own device, and gives you a clean result you can copy straight away — which matters when you use a utility like this several times a day.

Example

Paste {"name":"Monetub","tools":27,"free":true} and the formatter returns it indented over multiple lines, so nested objects and arrays become instantly scannable. Switch to minify and the same data collapses back into a single compact line for production.

Frequently Asked Questions

What is JSON?: A plain-text data format built from key/value pairs and arrays. It is the default response format for most modern web APIs.
Is my data uploaded?: No. Formatting happens entirely in your browser with JavaScript — nothing is sent to a server, logged, or stored.
Why does my JSON fail to parse?: The usual causes are trailing commas, single quotes instead of double quotes, or unquoted keys. The error message points at the exact position so you can fix it fast.