Developer
JSON Formatter
Paste messy JSON to instantly beautify it with clean indentation, catch syntax errors, or minify it for production. A fast, private JSON formatter and validator that runs entirely in your browser.
100% free · runs in your browser · nothing is uploaded.
Why use this tool
- 100% free, forever
- No sign-up or login
- Runs entirely in your browser
- Your files never leave your device
- Unlimited use, no watermarks
- Works on desktop and mobile
How to use JSON Formatter
- 1
Paste your JSON.
- 2
Click Format to beautify, or Minify to compress it.
- 3
Copy the result. Invalid JSON is flagged with the exact error.
Paste messy JSON to pretty-print it, catch syntax errors, or minify it for production. Pure client-side — nothing leaves your browser.
Frequently asked questions
Yes — if your JSON has a syntax error, you'll see exactly what's wrong.