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Actually Free JSON Formatter & Validator

Format, minify, validate and sort JSON free with precise error messages. Your data stays in your browser. Includes a folding tree view.

What it does

ActuallyFreeTools formats JSON for free — pretty-print with indentation, minify to one line, sort keys alphabetically, and validate with the exact parser error when it is broken. It runs in your browser, so API responses, tokens and configuration never leave your machine.

How to use it

  1. Paste JSON.
  2. Click Format, Minify or Sort keys.
  3. Fix any reported error, then copy.

Questions people ask

Why is my JSON invalid?

Common causes are trailing commas, single quotes or unquoted keys. The error message shows where parsing stopped.

Is it safe for sensitive data?

Yes — nothing is uploaded.

Can I convert JSON to Excel?

Yes, with Excel & CSV tools.

Is JSON formatter on ActuallyFreeTools really free?

Yes. There is no sign-up, no daily limit, no watermark and no paid tier. Nothing is held back for paying users.

Are my files uploaded anywhere?

No. JSON formatter runs inside your browser, so your files are processed on your own device and never sent to a server. That is also why there is nothing to meter or charge for.

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Last updated 30 October 2026. ActuallyFreeTools tools run entirely in your browser.