JSON Formatter & Validator

Beautify, minify and validate JSON — with the exact location of any error.

Runs 100% in your browser. Your files are not uploaded to any server.

How to use JSON Formatter & Validator

  1. Paste your JSON into the left box.
  2. Click “Format” to beautify it, or “Minify” to make it compact.
  3. If there is an error, the message shows the line and column and highlights the spot.
  4. Copy the result or download it as a .json file.

Frequently asked questions

Is it safe to paste private data?

Yes. Your JSON is processed only in your browser and never sent anywhere, so tokens, keys and customer data stay private.

What does “Sort keys” do?

It orders object keys alphabetically at every level, which makes two JSON documents much easier to compare.

Is JSON Formatter & Validator free?

Yes. JSON Formatter & Validator is free to use with no sign-up and no watermark.

Are my files uploaded to your server?

No. All processing happens locally in your browser using JavaScript and WebAssembly. Your files never leave your device, which also makes it fast and private.

Does it work on my phone?

Yes. It works in any modern browser on Windows, Mac, Linux, Android and iPhone. Very large files may be slow on older phones.

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