Input JSON
Output
Free Online JSON Formatter
Paste your JSON data and instantly format it with proper indentation, or minify it for production use. This tool validates your JSON syntax and highlights errors in real time. Works entirely in your browser — no data is sent to any server.
Features
- Format JSON with 2 or 4 space indentation
- Minify JSON for smaller file sizes
- Instant syntax error detection with error messages
- Copy formatted output with one click
- 100% client-side — your data never leaves your browser