How does the JSON formatter work?

Our JSON formatter parses your JSON using the browser's built-in JSON.parse() and then re-serializes it with JSON.stringify() using your chosen indentation (2 or 4 spaces). Everything runs 100% in your browser - no data is ever sent to a server.

Can I format large JSON files?

Yes! Since processing happens in your browser, it can handle JSON files up to several megabytes. For extremely large files (100MB+), consider using a streaming JSON processor.

Does the formatter validate JSON too?

Yes, the formatter will show you the exact error and position if your JSON is invalid. For advanced validation, try our dedicated JSON Validator tool.

Home/Tools/JSON Formatter & Beautifier

JSON Formatter & Beautifier

Q: Is my data safe when using this formatter?

Absolutely. Unlike jsonformatter.org which leaked 80,000+ files, our tool processes everything in your browser. Zero network requests are made with your data. You can verify this in your browser's DevTools Network tab.

Pretty-print JSON with syntax highlighting

100% client-side — your data never leaves your browser

Ctrl+Enter to process

Input

Output

Output will appear here...

Privacy guarantee:Unlike jsonformatter.org which leaked 80,000+ files in November 2025, JSONShield processes everything in your browser. Zero network requests with your data. Open your browser DevTools (Network tab) to verify — you'll see zero outbound requests containing your JSON.