JSONPretty

A frontend-only JSON formatting, validation, and conversion tool. Your JSON never leaves your browser.

Privacy

JSONPretty runs 100% in the browser. No data is sent to any server. No analytics, no tracking, no cookies.

Features

• Format / Prettify — Paste ugly JSON, get it beautifully formatted
• Validate — Clear error messages pointing to the exact line
• JSON to YAML — One-click conversion
• JSON to CSV — Convert arrays of flat objects to CSV
• Diff — Compare two JSON objects side by side
• Dark mode — System detection + manual toggle
• Multilingual — English, Spanish, French, Italian, Portuguese, German, Czech
• PWA — Install it as a native app
• Responsive — Works on desktop and mobile

Getting Started

npm install
npm run dev

Contributing

Found a bug or have a feature request? Open an issue.

Support

License

MIT