JSON Validator & Formatter
Validate, format, and beautify JSON data instantly. Free, browser-local, no file uploads.
Use the Json Formatter →Paste any JSON and instantly format it with proper indentation, or minify it for production use. Includes validation with error highlighting. All processing is local.
It’s completely free — no signup, no credit card, no hidden limits. All processing runs locally in your browser. Your files never leave your device.
Frequently Asked Questions
Can I use this with large JSON files?
Yes. Large JSON files are handled in your browser memory. For very large files, performance depends on your device.