JSON Formatter & Validator Online
Format, minify, and validate JSON in your browser. Instant error detection with clear messages. No data sent anywhere.
Try JSON Formatter →About PassGen JSON Formatter
PassGen JSON Formatter parses, formats, and validates JSON locally in your browser. Supports configurable indentation, minification, and detailed error reporting with line and position information.
Features
✨ Pretty Print
Format JSON with customizable indentation (2 or 4 spaces).
📦 Minify
Compress JSON by removing all whitespace.
✅ Validate
Check JSON syntax with clear error messages and positions.
🛡️ Complete Privacy
No data is sent to any server. Everything stays in your browser.
How to Use
- Paste or type JSON in the input field.
- Click Format to pretty-print or Minify to compress.
- Click Validate to check for syntax errors.
- Copy the result or use it as new input.
Frequently Asked Questions
What JSON errors are detected?
All syntax errors including missing commas, unclosed brackets, invalid keys, and trailing commas.
Can I format large JSON files?
Yes. Processing happens locally so there are no size limits beyond your browser's memory.
Is my data safe?
Yes. Everything runs locally in your browser. No data is transmitted.