JSON Formatter
Beautify, minify and validate JSON instantly with syntax highlighting and precise error locations.
- Processed locally — your files never leave your device
- Free, no sign-up
- No file limits
Input
Output
Formatted output will appear here.How to use JSON Formatter
- 1
Paste or type your JSON into the input panel.
- 2
Choose Beautify or Minify, pick an indent size and optionally sort keys.
- 3
Copy the result or download it as a .json file.
Features
- Live validationSee instantly whether your JSON is valid, with the exact line and column of any error.
- Syntax highlightingKeys, strings, numbers and booleans are colour-coded for easy reading.
- Sort keysAlphabetically sort object keys at every level for clean diffs.
- Runs locallyYour data is never sent to a server — safe for API keys and private payloads.
Frequently asked questions
Is my JSON data sent anywhere?
No. Formatting and validation are done with JavaScript in your browser, so your data stays on your device.
Can it handle large JSON files?
Yes. Files of several megabytes format instantly. Syntax highlighting is skipped for very large outputs to keep things fast.
What’s the difference between beautify and minify?
Beautify adds indentation and line breaks for readability. Minify removes all unnecessary whitespace to make the payload as small as possible.