🧩 JSON Formatter — Beautify, Minify & Validate
A free JSON formatter that pretty-prints, minifies, and validates JSON directly in your browser — no file upload, no account required, and it works fully offline.
Result
About
Paste any JSON and choose Beautify (2 spaces, 4 spaces, or tab indent) or Minify to compress it into a single line. The validator catches syntax errors and shows the exact line and column where the problem occurred. Because all processing runs in your browser via JavaScript, your data never leaves your device — ideal for sensitive API payloads, config files, or private data.
How to use
- Paste your JSON into the input box (or click 'Sample' to try an example).
- Click 'Beautify' to pretty-print, or 'Minify' to compress to one line.
- Choose your preferred indent style — 2 spaces, 4 spaces, or tab.
- If the JSON has errors, the validator highlights the exact line and column.
- Click 'Copy' to copy the result to your clipboard.
FAQ
- Is this JSON formatter free?
- Yes, completely free — no account, no subscription, and no usage limits.
- Does it upload my JSON to a server?
- No. All formatting and validation happens entirely in your browser using JavaScript. Your data never leaves your device.
- Does it work offline?
- Yes. Once the page is loaded, you can disconnect from the internet and it will continue to work normally.
- Can it detect where a JSON syntax error is?
- Yes. If the JSON is invalid, the tool shows the line number and column where the error occurred, making it easy to fix.
- What indent options are available?
- You can choose 2 spaces, 4 spaces, or tab indentation. Changing the option instantly reformats the output.