Free · In-Browser · No Data Sent
JSON Formatter & Validator
Paste ugly, minified or broken JSON — get clean, readable, indented output instantly.
Input JSON
Indent:
Formatted Output
Instant Formatting
Paste any JSON — minified, nested, or poorly formatted — and get back clean, indented output in milliseconds.
100% Private
All processing happens in your browser using JavaScript. No data is ever sent to any server.
Syntax Validation
Invalid JSON triggers a clear error message showing exactly which line and character has the problem.
Minify Mode
Remove all whitespace and compress JSON to the smallest possible size — useful for APIs and storage.