What is YAML validation?

Checking that a YAML document is syntactically correct — proper indentation, valid data types, and no illegal characters.

What are common YAML errors?

Inconsistent indentation (tabs vs spaces), missing colons, invalid escape sequences, and duplicate keys.

Where is YAML commonly used?

GitHub Actions workflows, Docker Compose files, Kubernetes manifests, Ansible playbooks, and most CI/CD pipelines.

Yes, all validation happens in your browser.

YAML Validator

Validate YAML syntax and view the parsed structure as formatted JSON.

YAML Input

Parsed JSON

YAML Validator parses your YAML using the js-yaml library and reports any syntax errors with line and column information. Valid YAML is also shown as formatted JSON so you can verify the parsed structure.

Frequently Asked Questions

: Indentation consistency, valid data types, correct colon/dash syntax, and illegal characters. Common errors like mixing tabs and spaces are flagged.

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