JSON Formatter

Format, beautify, minify and validate JSON instantly — errors pinpointed by line and column, all in your browser.

✓ Valid JSON
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About this tool

Minified JSON from an API response is unreadable; this formatter makes it human again in one click. Paste any JSON and beautify it with 2-space, 4-space or tab indentation — or minify it back to a single compact line for production payloads.

Validation is built in: if the JSON is broken, you get the exact error with line and column numbers, so a missing comma or stray trailing bracket takes seconds to find instead of minutes. Valid documents get a green confirmation.

Everything happens locally in your browser — your API keys, customer data and payloads are never uploaded to any server, which makes this safe to use even with production data. When you are done, copy the result or download it as a .json file.

How to use

  1. Paste your JSON into the input box.
  2. Choose indentation (2 spaces, 4 spaces or tabs).
  3. Click Format to beautify or Minify to compress.
  4. Fix any error shown with its line and column, then copy or download the result.

Frequently asked questions

No. Parsing, formatting and validation all run in your browser. Sensitive payloads and API responses never leave your device.

They come straight from the JSON parser and include the line and column of the first problem — typically a missing comma, an unquoted key or a trailing comma.

Yes — Minify strips all whitespace for the smallest possible payload; Format expands it for reading.

Only your browser's memory. Documents of several megabytes format fine on a typical machine.