About JSON Validator & Formatter
Validate and format JSON data with real-time error detection. Perfect for developers, API testing, configuration files, and data validation. Beautify or minify JSON with customizable indentation.
Features
- Validation: Instant JSON syntax validation
- Error Detection: Detailed error messages with line info
- Beautify: Format JSON with proper indentation
- Minify: Compress JSON by removing whitespace
- Customizable Indent: Choose 2, 4, or 8 spaces
- Copy to Clipboard: One-click copy functionality
- Download: Save formatted JSON as .json file
- Sample Data: Load example JSON for testing
- Real-time Feedback: Visual validation status
How to Use
- Paste your JSON in the left panel
- Select indent size (2, 4, or 8 spaces)
- Click "Beautify" to format or "Minify" to compress
- Check validation status (green = valid, red = invalid)
- Copy formatted JSON or download as file
What is JSON?
JSON (JavaScript Object Notation) is a lightweight data-interchange format. It's easy for humans to read and write, and easy for machines to parse and generate. JSON is widely used for APIs, configuration files, and data storage.
Common JSON Errors
- Missing comma: Between object properties or array items
- Trailing comma: After last item (not allowed in JSON)
- Unquoted keys: Object keys must be in double quotes
- Single quotes: Use double quotes for strings
- Unclosed brackets: Missing closing }, ], or )
- Invalid values: Undefined, NaN, or Infinity not allowed
Use Cases
- Validate API responses and requests
- Format configuration files (package.json, tsconfig.json)
- Debug JSON data structures
- Prepare JSON for documentation
- Minify JSON for production deployment
- Clean up messy JSON from external sources
- Verify JSON before database insertion
Beautify vs Minify
- Beautify: Adds indentation and line breaks for readability
- Minify: Removes all whitespace to reduce file size
- When to beautify: Development, debugging, documentation
- When to minify: Production, API responses, storage optimization
Privacy & Security
All JSON processing happens locally in your browser. Your data is never uploaded to any server, ensuring complete privacy and security for sensitive configuration files and API data.
Tips
- Use 2-space indent for compact formatting
- Use 4-space indent for better readability
- Minify JSON before sending over network
- Always validate JSON before deployment
- Check error messages for exact problem location
- Use sample data to test the validator