YAML Validator

Validate YAML syntax and structure with this free online tool

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About This Tool

This YAML Validator Online tool allows you to validate YAML documents for correct syntax and structure. Simply paste your YAML code or upload a YAML file, and the tool will check for errors, display detailed error messages with line numbers, and show the parsed structure. The tool uses the robust js-yaml library for accurate parsing and validation. It's perfect for developers working with configuration files, API specifications, or any YAML-based documents.

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How to Use

Paste your YAML code into the text area or upload a YAML file using the upload button
Click the 'Validate YAML' button to check your YAML syntax
View validation results including any errors with line numbers
See the parsed YAML structure in a formatted display
Use the 'Clear' button to reset the form and start over

Frequently Asked Questions

Find Quick Answers

What is YAML and why validate it?

YAML (YAML Ain't Markup Language) is a human-readable data serialization format commonly used for configuration files. Validating YAML ensures your configuration files are syntactically correct and will be parsed properly by applications.

Does this tool store my YAML data?

No, all validation happens entirely in your browser. Your YAML data is never sent to any server, ensuring complete privacy and security.

What YAML versions does this tool support?

The tool supports YAML 1.2 specification using the js-yaml library, which handles most common YAML features including anchors, aliases, and complex data structures.

Can I validate large YAML files?

Yes, the tool can handle reasonably large YAML files, though very large files may impact browser performance since processing happens client-side.

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