absurdtools

JSON Formatter & Validator

Beautify, minify, and validate JSON with clear error messages — all in your browser.

How to use

  1. Paste your JSON into the input box.
  2. Click Format to pretty-print it, or Minify to compress it.
  3. If the JSON is invalid, an error message points to the problem.

Frequently asked questions

Is my JSON uploaded to a server?

No. Parsing and formatting happen entirely in your browser, so even sensitive data stays on your machine.

What indentation does it use?

Formatting uses two spaces by default, which is the most common convention and keeps files compact and readable.

Why does it say my JSON is invalid?

Common causes are trailing commas, single quotes instead of double quotes, unquoted keys, or missing brackets. The error message shows where parsing failed.

🔒 This tool runs entirely in your browser. Nothing you enter is uploaded, logged, or stored.

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