JSON Formatter
Format, beautify, validate, and minify JSON data with real-time syntax error highlighting
JSON Formatter / Validator
Format, beautify, validate, and minify JSON data online with real-time syntax error location for quick debugging.
How to Use
- Paste your JSON data into the input field on the left
- Click "Format" to beautify the JSON with proper indentation for easy reading
- Click "Minify" to remove all whitespace and line breaks, reducing file size
- Click "Validate" to check JSON syntax; errors will show the exact line and position
Notes
- This tool processes data entirely in your browser — your JSON is never sent to any server
- Very large JSON files (over 10 MB) may cause browser performance issues
- JSON standard does not allow trailing commas or single-quoted strings; these will be flagged as syntax errors
FAQ
What is JSON?
JSON (JavaScript Object Notation) is a lightweight data interchange format that is easy for humans to read and write, and easy for machines to parse and generate. It is one of the most commonly used data formats for modern APIs and configuration files.
What is the difference between format and minify?
Formatting (beautifying) adds indentation and line breaks to make the JSON structure clear and readable, ideal for debugging and review. Minifying removes all unnecessary whitespace and line breaks to reduce data size, ideal for network transmission and storage.
How large a JSON file can this handle?
This tool runs in your browser, so processing capacity depends on your device. Generally, JSON files under 5 MB are handled smoothly; files over 10 MB may experience lag.
Is my data secure?
Completely secure. All processing runs locally in your browser. Your JSON data is never transmitted to any external server and is discarded when you close the page.