DeveloperFree browser tool
JSON Formatter – Format & Validate JSON Online
Format and beautify JSON data online. Validate and prettify your JSON with syntax highlighting.
No sign-upMobile readyPrivate by default
DEV
Tool
Enter your values and get results instantly.
HOW
How to Use
- 1Paste your JSON data
- 2Click Format button
- 3Copy formatted JSON
- 4Or validate your JSON
WIN
Benefits
Instant formatting
JSON validation
Error detection
Copy to clipboard
Free
No data sent to server
FAQ
Frequently Asked Questions
What does this JSON formatter do?
It takes messy, minified JSON and makes it readable with proper indentation, line breaks, and syntax highlighting. You can also validate JSON to find errors.
Can I use this for large JSON files?
Yes, but keep in mind that processing happens in your browser. For very large files (several MB), it may take a moment – but your data stays private.
Is my JSON data sent to your server?
Never. All formatting and validation runs entirely on your device. We cannot see your data.
Can I format JSON from an API response?
Absolutely – paste your API response directly into the tool, and it instantly becomes readable JSON.
What happens if my JSON has an error?
The tool shows you exactly where the error is and what is wrong, so you can fix it quickly.