YAML Validator - Validate YAML Syntax Online

Our free YAML validator allows you to validate YAML syntax and check for errors instantly. Perfect for developers working with configuration files, CI/CD pipelines, and YAML-based data formats. Get detailed error messages and line numbers to quickly fix syntax issues.

What is YAML?

YAML (YAML Ain't Markup Language) is a human-readable data serialization standard commonly used for configuration files, data exchange, and application settings. YAML uses indentation to represent structure and supports various data types including strings, numbers, lists, and maps.

How Our YAML Validator Works

Our validator:

Parses YAML syntax using industry-standard libraries
Validates structure, indentation, and syntax
Provides detailed error messages with line numbers
Formats valid YAML for better readability
Highlights specific error locations when possible

Key Features

Real-time Validation: Validate YAML as you type with automatic error checking
Detailed Error Messages: Get specific error descriptions and line numbers
Auto-formatting: Automatically format valid YAML with proper indentation
File Upload: Validate YAML files directly from your computer

Common Use Cases

Validating CI/CD pipeline configuration files
Checking Docker Compose and Kubernetes YAML files
Validating configuration files for applications
Debugging YAML syntax errors in data files

Frequently Asked Questions

Is the YAML validator free to use?

Yes, our validator is completely free to use with no registration or usage limits.

Does it validate YAML schemas?

Our validator checks YAML syntax and structure. For schema validation (checking data types and values), you may need additional tools.

Can I format YAML with this tool?

Yes, when your YAML is valid, the tool automatically formats it with proper indentation and structure.