How to format JSON online
Paste your JSON into the input box, choose indentation, and click "Format JSON". JSON Master will beautify your JSON and show it in the output panel.
Why use JSON Master?
JSON Master is a powerful, free online tool designed for developers who work with JSON data daily. Whether you're debugging API responses, formatting configuration files, or validating data structures, our tool makes it quick and easy.
Key Features
- Instant Formatting: Beautify messy JSON with proper indentation in one click
- Validation: Quickly identify syntax errors and get helpful error messages
- Minification: Compress JSON for production use or reduce file size
- Customizable: Choose between 2 or 4 space indentation to match your coding style
- Privacy First: All processing happens in your browser - your data never leaves your device
- No Installation: Works directly in your browser, no downloads or sign-ups required
Common Use Cases
- Debugging API responses from REST endpoints
- Formatting configuration files for better readability
- Validating JSON before sending it to production
- Converting between formatted and minified JSON
- Learning JSON structure for educational purposes
- Preparing JSON data for documentation
Tips for Best Results
For optimal performance, ensure your JSON is properly escaped and uses double quotes for strings. If you encounter validation errors, check for common issues like trailing commas, missing brackets, or unescaped characters.
Our tool also provides helpful statistics including line count, character count, and file size to help you understand your JSON data better. Use the keyboard shortcut Ctrl+Enter (or Cmd+Enter on Mac) to quickly format your JSON without clicking the button.