Developer Tools • Free • Browser-Based
JSON Formatter & Validator
Format, validate, and minify JSON instantly in your browser.
Privacy: All processing runs in your browser. No input is sent to any server.
About
JSON Formatter & Validator
Paste JSON to pretty-print it with proper indentation, validate its syntax, and minify it back to a single line. All processing happens in your browser — no data leaves your device.
FAQ
Frequently Asked Questions
- Is my data sent to any server?
- No. All JSON formatting runs in your browser using JavaScript. Your data never leaves your device.
- What JSON standard does this support?
- This tool validates and formats JSON conforming to RFC 8259. It does not support JavaScript-specific extensions like trailing commas or comments.
- Does this work offline?
- Once the page has loaded, the formatter works without an internet connection.
- Is there a maximum size?
- There is no hard limit enforced by this tool. Very large JSON (50 MB+) may be slow depending on your browser and device.