YAML Validator & Linter
Validate and lint your YAML code to ensure it follows proper syntax and best practices. Free, secure, and processed entirely in your browser.
Click or drag & drop to upload
Upload a YAML file to validate
YAML Content
Paste your YAML content below or upload a file above
Validation Options
Verify consistent space indentation
Flag lines exceeding maximum length
YAML Validation Tips
- Ensure proper indentation using spaces (not tabs)
- Be mindful of spaces after colons in mappings (key: value)
- Use quotes for strings with special characters
- YAML is case-sensitive, ensure consistent casing
- Lists items are denoted with a leading hyphen and a space (- item)
- Check for balanced quotes and matching opening/closing structures
- Use the formatting option to fix common issues automatically
- For multi-line strings, use the | or > operators
About YAML Validator & Linter
Our YAML validator and linter is a powerful tool that helps you identify and fix syntax errors and formatting issues in your YAML files. Whether you're working with Kubernetes configurations, GitHub Actions workflows, or any other YAML-based content, our tool ensures your code is valid and follows best practices.
The validator checks for syntax correctness, while the linter analyzes your code for potential issues, inconsistencies, and formatting problems that might cause issues in production.
Features
- Comprehensive YAML syntax validation
- Detailed error reporting with line numbers
- Code formatting suggestions
- Indentation checking and fixing
- Detection of duplicate keys
- Support for YAML 1.2 specification
- Browser-based processing for privacy
- Support for large YAML files
How To Use
- Enter or paste your YAML code in the input field
- Alternatively, upload a YAML file from your device
- Configure the validator settings according to your needs
- Click the Validate button to check your YAML
- Review any errors or warnings identified by the validator
- Use the Format button to improve your YAML structure
- Copy or download the validated and formatted YAML
Privacy and Security
Our YAML validator processes all data entirely within your browser. Your YAML code never leaves your device or gets sent to any server, ensuring complete privacy and security. This makes it safe to validate sensitive configuration files without any risk of data exposure.
Common Use Cases
DevOps Configuration
Validate Kubernetes, Docker Compose, and other infrastructure configuration files before deployment.
CI/CD Workflows
Check GitHub Actions, GitLab CI, and other CI/CD pipeline configurations for syntax errors.
Application Configuration
Verify configuration files for applications that use YAML for settings and parameters.
Data Exchange
Ensure data files in YAML format are correctly structured before sharing or processing.
Frequently Asked Questions
Is this YAML validator completely free?
Yes, our YAML validator is 100% free to use with no limitations on file size or number of validations.
How is my data processed?
All validation and linting happens locally in your browser. Your data never leaves your device or gets stored on any server.
What validation rules are applied?
Our validator checks for YAML 1.2 specification compliance, proper indentation, duplicate keys, and other common issues in YAML files.
Can I validate large YAML files?
Yes, our tool is designed to handle large YAML files, though the ultimate limitation will depend on your browser and device capabilities.
Does the linter enforce specific style conventions?
Yes, the linter checks for consistent spacing, indentation, key ordering, and other formatting conventions that make YAML more readable and maintainable.