Paste your JSON to format, validate, and beautify it. Everything happens in your browser — your data stays private.
Formatted JSON will appear here...
About JSON Formatting
JSON (JavaScript Object Notation) is a lightweight data interchange format. Properly formatted JSON is essential for debugging APIs, reading configuration files, and working with web services.
This tool validates your JSON against the standard specification, catches common errors like trailing commas and single quotes, and formats the output with your preferred indentation style.
Features
Real-time JSON validation with clear error messages
Customizable indentation (2 spaces, 4 spaces, or tabs)
One-click minification to reduce file size
100% client-side — your data never leaves your browser
JSON formatting (or beautifying) is the process of adding proper indentation, line breaks, and spacing to minified or poorly formatted JSON data, making it human-readable and easier to debug.
Is my data safe when using this JSON formatter?▼
Yes, absolutely. This JSON formatter runs 100% in your browser using JavaScript. Your data never leaves your computer — nothing is sent to any server.
What's the difference between formatting and minifying JSON?▼
Formatting adds whitespace, indentation, and line breaks for readability. Minifying removes all unnecessary whitespace to reduce file size, which is useful for production APIs and data transfer.
Can this tool validate JSON syntax?▼
Yes. The formatter automatically validates your JSON and shows clear error messages with line numbers if there are syntax errors like missing commas, unclosed brackets, or invalid values.
Keyboard Shortcuts
Ctrl+Enter Run / Format Ctrl+Shift+C Copy output Ctrl+L Clear