JSON Formatter & Validator
Format, beautify, minify, and validate JSON data instantly. Real-time syntax error detection with line numbers, customizable indentation, and one-click copy.
How to Use
- 1
Paste or type your JSON data into the input panel
- 2
Click Format/Beautify to pretty-print, Minify to compress, or Validate to check syntax
- 3
Adjust indentation size (2 or 4 spaces) as needed
- 4
Copy the formatted result or clear to start over
Key Benefits
100% Private
All JSON processing happens in your browser. Your data never leaves your device.
Real-time Validation
Instantly detect syntax errors with precise line number and position information.
Format & Minify
Beautify JSON with customizable indentation or minify it to reduce file size.
No Installation Required
Works directly in your browser. No software to download or accounts to create.
Frequently Asked Questions
Is my JSON data sent to a server?
No. All formatting, validation, and minification happens entirely in your browser using JavaScript. Your data never leaves your device.
What types of JSON errors can it detect?
The tool detects all JSON syntax errors including missing commas, unmatched brackets, invalid strings, trailing commas, and incorrect value types. Error messages include the line number and position.
Can I switch between 2-space and 4-space indentation?
Yes. Use the indent size selector to choose between 2 or 4 spaces, then click Format to apply the new indentation.
What is JSON minification?
Minification removes all unnecessary whitespace, line breaks, and indentation from JSON data, reducing file size while keeping the data structure identical.
Is there a size limit for JSON input?
There is no hard limit, but very large JSON files (over 10MB) may be slower to process depending on your browser and device.