JSON Formatter

Paste minified or messy JSON and get a validated, indented, readable version instantly — with a clear error message if it's invalid.

How it works

  1. Paste your JSON into the input box on the left.
  2. Get formatted output indented and validated instantly on the right.
  3. Fix errors fast invalid JSON shows exactly what's wrong and where.

Frequently asked questions

Is my JSON sent anywhere?

No — formatting and validation run entirely in your browser. Nothing is uploaded.

Can it minify instead of pretty-print?

Yes, use the Minify option to collapse formatted JSON back to a single compact line.

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