JSON Formatter
Format & validate JSON instantly
Format, validate, and beautify JSON data instantly. Detect syntax errors with exact line numbers. Minify for production.
How to Use JSON Formatter
- 1Paste your JSON into the input box
- 2Click "Format" to beautify with indentation
- 3Errors are highlighted with exact line numbers
- 4Use "Minify" to compress for production use
- 5Click "Copy" to copy the result
Features
- Instant JSON formatting and validation
- Syntax error detection with line numbers
- Adjustable indentation (2 or 4 spaces)
- Minify mode to compact JSON
- Copy formatted or minified output
- Runs entirely in browser — no upload
- Handles large JSON up to 5MB
Frequently Asked Questions
Is my JSON data safe?
Yes. All formatting happens in your browser using JavaScript. Your data never leaves your device.
What's the difference between formatting and minifying JSON?
Formatting adds indentation and line breaks for human readability. Minifying removes all whitespace for the smallest production file size.
Can this validate my JSON?
Yes. The formatter validates your JSON and shows a clear error message with the exact position of any syntax error.