JSON Formatter & Validator Online
Format, validate, and beautify JSON data with our free online JSON formatter. This powerful tool provides syntax highlighting, error detection, and validation to ensure your JSON is properly structured. All processing happens locally in your browser for maximum privacy and security. Perfect for developers, API testing, configuration files, and data validation. Simply paste your JSON, click format, and get beautifully formatted, validated JSON instantly. No registration required, completely free to use.
How to Use the JSON Formatter
- Paste or Type JSON: Enter your JSON data in the input area above
- Load from File: Use the "Load File" button to upload a .json file
- Format & Validate: Click "Format & Validate" to beautify and check your JSON
- Review Results: Check the validation status and formatted output
- Copy or Download: Use the copy button or download the formatted JSON
Why Use This JSON Formatter?
🔒 Privacy First
All processing happens locally in your browser. Your JSON data never leaves your device.
⚡ Lightning Fast
Instant formatting and validation with real-time syntax highlighting.
🎯 Error Detection
Comprehensive error detection with detailed error messages and line numbers.
📱 Mobile Friendly
Responsive design that works perfectly on desktop, tablet, and mobile devices.
Frequently Asked Questions
What is JSON formatting?
JSON formatting involves adding proper indentation, line breaks, and spacing to JSON data to make it human-readable while maintaining its structure and validity.
How does JSON validation work?
Our validator checks your JSON against the official JSON specification, identifying syntax errors, missing brackets, incorrect commas, and other formatting issues.
Can I use this tool offline?
Yes! Once the page loads, all formatting and validation happens in your browser without requiring an internet connection.