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Free developer tool

JSON Formatter & Validator

Paste JSON to prettify it with clean indentation, minify it for production, or catch syntax errors. Size and key counts are shown, and your data never leaves your browser.

Free · No sign-up · Runs in your browser

Features

  • Prettify and minify
  • Error detection
  • Size and key count
  • Private – runs in your browser

How to use the JSON Formatter & Validator

  1. Paste your JSON.
  2. Click Prettify or Minify.
  3. Copy the result.

Frequently asked questions

Is my JSON uploaded?

No, formatting happens locally in your browser.

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