YAML Formatter & Validator Pro
Format, validate, and optimize YAML with enterprise-grade precision and real-time feedback
YAML Input
Formatted Output
Formatted Output
How to format YAML online?
Format and validate YAML files with our professional YAML formatter. Ensure proper indentation, syntax validation, and readability. Perfect for configuration files, CI/CD pipelines, and data serialization with comprehensive error checking.
Features
- Real-time YAML syntax validation with precise error locations and line numbers
- Configurable formatting with multiple style options and indentation settings
- JSON Schema validation support for comprehensive data integrity checking
- Professional minification and optimization tools for production-ready YAML
- Advanced features including YAML comparison, merging, and transformation
- Complete history tracking with searchable operation logs and statistics
- Enterprise-grade performance with web worker integration for large files
- Full accessibility support with keyboard navigation and screen reader compatibility
How to use
- Paste your YAML content in the input area or drag and drop a file
- Configure formatting options like indent size, quote style, and flow style
- Click 'Format YAML' to beautify your code with proper indentation and structure
- Use 'Validate' to check syntax and identify any errors or warnings
- Optionally paste a JSON Schema to validate your YAML data structure
- Use 'Minify' to remove unnecessary whitespace for production deployment
- Access your operation history to review and reuse previous formatting sessions
Tips & Best Practices
- Always validate your data before processing to catch syntax errors early.
- Use the copy button to quickly transfer formatted output to your clipboard.
- For large files, consider breaking them into smaller chunks for better performance.
- Back up your original data before applying any transformations.
- Use keyboard shortcuts for faster workflow: Ctrl+A to select all, Ctrl+C to copy.
FAQ
What YAML versions are supported?
We support YAML 1.1, YAML 1.2, and common YAML dialects with comprehensive validation and formatting options.
Can I validate against a JSON Schema?
Yes! Paste your JSON Schema in the schema input area for comprehensive data validation. We support JSON Schema Draft 7, 2019-09, and 2020-12.
How accurate is the error reporting?
Our validation provides precise error locations with line numbers, column positions, and helpful suggestions for fixing issues. Results are validated against industry standards to ensure accuracy and reliability across a wide range of input scenarios.
Can I process large YAML files?
Yes! We use web workers for processing, ensuring the UI remains responsive even with large files. There's no practical file size limit.
Is my data secure?
Absolutely! All processing happens locally in your browser. Your YAML data never leaves your device, ensuring complete privacy and security.
Can I customize the formatting output?
Yes! You can configure indent size, line width, quote style, flow style, and many other formatting options to match your preferences.
Does the tool support YAML comments?
Yes! You can choose to preserve or remove comments during formatting, and the validator will check comment syntax as well.
Can I compare two YAML documents?
Yes! The tool includes advanced features for comparing YAML documents, merging multiple files, and extracting specific data paths.