JSON Formatter & Beautifier
Paste your raw JSON below to instantly validate, beautify with proper indentation, or minify it into a compact string. Get clear error messages that pinpoint syntax issues so you can fix them fast.
Why use this tool?
Working with raw, unformatted JSON is error-prone and hard to read. This formatter instantly structures your data with consistent indentation so you can spot missing commas, mismatched brackets, and other common mistakes at a glance.
- Instant validation — catch syntax errors before they break your app or API integration.
- Beautify — add 2-space indentation for readable, review-friendly output.
- Minify — strip whitespace to reduce payload size for production.
- Privacy — all processing happens in your browser. Your data never touches a server.
How to use
- Paste your JSON string into the input field.
- Click Format to beautify with indentation, or Minify to compress it.
- Review the output in the result field below.
- Click Copy Output to copy the result to your clipboard.
- If your JSON has errors, a message will appear describing the problem.
Frequently Asked Questions
Yes, the MushTools JSON formatter is completely free with no sign-up required. All formatting happens in your browser, so your data is never uploaded to a server.
Yes. Click the Minify button to strip all whitespace and produce a compact JSON string suitable for transmission or storage.
If your JSON contains a syntax error, the tool displays a clear message describing the problem and the approximate position of the error so you can fix it quickly.
No. Everything runs client-side in your browser. Your JSON never leaves your device, is not stored, and is not sent to any server.