About this JSON Formatter
This is a free online JSON formatter that runs 100% in your browser. Paste any JSON — messy, minified, or invalid — and instantly get a beautified, validated result. The tool uses the native JSON.parse and JSON.stringify APIs, so it is fast and handles large files easily.
Common use cases
- Reading minified API responses
- Debugging JSON configuration files
- Validating JSON before sending to an API
- Compressing JSON for production payloads
Privacy
No input is ever sent to a server. Everything happens in your browser. You can use this tool offline once the page is loaded.