Format, minify, and validate JSON with syntax highlighting.
JSON Formatter turns messy, minified, or hand-written JSON into clean, indented, easy-to-read output — with syntax highlighting so keys, strings, numbers, and booleans are visually distinct at a glance.
It also doubles as a validator: if your JSON has a syntax error, you'll see exactly what's wrong instead of a cryptic parser message. Everything runs client-side, so nothing you paste is ever sent to a server.
No. Formatting, validation, and minification all happen locally in your browser using the native JSON parser — your data never leaves your device.