Format, validate, and beautify JSON data instantly with syntax error detection and exact line numbers. Minify for production, adjust indentation, and keep your data private — all processing stays in your browser.
How to Use JSON Formatter
- 1Paste your JSON into the input box
- 2Click "Format" to beautify with adjustable indentation (2 or 4 spaces)
- 3Syntax errors are highlighted with exact line numbers for quick fixes
- 4Use "Minify" to compress JSON for production use
- 5Click "Copy" to copy the result, or use the JSON Visualizer to explore the structure
Features
- Instant JSON formatting with adjustable indentation (2 or 4 spaces)
- Syntax error detection with exact line numbers and clear error messages
- Minify mode to compact JSON for production deployment
- Handles large JSON up to 5MB — all processing in your browser, no upload
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.
Can I explore JSON structure visually?
Yes. For an interactive tree view with collapsible nodes, use the JSON Visualizer.