What happens if my JSON is invalid?

The tool shows the exact parser error (e.g. an unexpected token and its position) instead of silently failing, so you can find and fix the problem quickly.

Is my JSON sent to a server?

No, formatting and minifying both happen entirely in your browser.

JSON Formatter

Format, validate and minify JSON with clear error messages.

{

"id": 1,

"name": "Ada Lovelace",

"born": 1815,

"skills": ["mathematics", "programming"]

}

Your file never leaves this browser tab — everything runs locally on your device.

How to use json formatter

Paste your JSON into the editor.
Click "Format" for readable, indented output, or "Minify" to strip all whitespace.
Copy the result or download it as a .json file.

Common use cases

Making a minified API response readable while debugging.
Cleaning up JSON before pasting it into documentation or a code review.
Quickly spotting a syntax error in a hand-written config file.

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