Free JSON Formatter - Beautify/Validate/Minify JSON Online
Why Choose Our JSON Formatter?
Pure frontend JavaScript implementation. All operations happen in your browser locally. Beautify (with indentation), minify (remove whitespace), validate (precise line/column error reporting), sort keys (A-Z). Fast processing, supports up to 10MB files.
How to Use the JSON Formatter
1. Paste JSON or upload .json file
2. Click 'Format' to beautify (2/4-space indent)
3. Click 'Minify' to remove whitespace
4. Click 'Validate' to check syntax errors
5. Click 'Sort' to sort keys A-Z
6. Copy result with one click
Frequently Asked Questions
How do I locate JSON errors?
The tool reports exact error location (line and column number) and reason (missing quotes, trailing commas, etc). Click the error to jump to the location.
Do you support JSON5 or JSONC?
JSONC (with comments) is supported. JSON5 extensions (single quotes, etc.) are not yet supported.
Will large files lag?
Files up to 10MB process smoothly. Larger files may lag β use command-line tools like jq for very large files.
Is my data secure?
All processing is local in your browser. JSON data never leaves your device.