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. 1

    Paste your JSON.

  2. 2

    Click Format to beautify, or Minify to compress it.

  3. 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.

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