JSON Formatter & Validator - Beautify & Validate JSON Online
Beautify, validate, and format your JSON code instantly. Fix syntax errors, minify for production, and validate JSON structure online for free.
JSON Formatter and Validator
About This JSON Formatter & Validator
Our free online JSON formatter helps developers beautify, validate, and minify JSON data instantly. Whether you're debugging API responses, formatting configuration files, or preparing JSON for production, this tool makes it easy with real-time validation and error detection.
Key Features
Automatically detects syntax errors like missing commas, brackets, or quotes with helpful error messages.
Format messy JSON with proper indentation (2 spaces) for maximum readability and code review.
Remove all whitespace and line breaks to reduce file size for production deployment.
All processing happens in your browser. Your JSON data never leaves your device.
How to Use the JSON Formatter
- Paste JSON: Copy your JSON data and paste it into the input box
- Auto-Validate: The tool automatically validates and detects any syntax errors
- Choose Mode: Click "Format" to beautify or "Minify" to compress
- Copy Result: Click "Copy Result" to copy the formatted JSON to clipboard
Why Use a JSON Formatter?
JSON formatters are essential tools for modern development:
- API Development: Format and validate API responses for debugging
- Configuration Files: Make config files readable and maintainable
- Data Analysis: Understand complex JSON structures quickly
- Code Review: Present JSON data in a readable format for team review
- Production Optimization: Minify JSON to reduce bandwidth and load times
Common JSON Errors We Detect
- Missing Commas: Between object properties or array elements
- Trailing Commas: After the last element (not allowed in JSON)
- Unquoted Keys: Object keys must be in double quotes
- Single Quotes: JSON requires double quotes, not single quotes
- Unclosed Brackets: Missing closing brackets or braces
- Invalid Values: Undefined, NaN, or other non-JSON values
JSON Best Practices
- Use double quotes for strings and keys
- Avoid trailing commas
- Use consistent indentation (2 or 4 spaces)
- Keep JSON files under 1MB for performance
- Validate before deployment
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