YAML Validator
Validate YAML syntax to ensure your YAML data is correctly formatted. This tool checks for indentation errors, syntax issues, and other common YAML formatting problems. Get clear error messages to help you fix issues quickly.
When to use this tool
You have a YAML config that fails in CI/CD or Kubernetes and need precise syntax feedback.
You want to validate indentation and structure before committing changes.
Examples
Indentation error
Input
service:
name: api
ports:
- 3000Output
Error: Inconsistent indentation near "ports".
Use consistent 2-space indentation for nested blocks.
Developer use cases
Validate Kubernetes manifests before applying them.
Check CI pipeline configs after editing by hand.
Common mistakes to avoid
Using tabs instead of spaces for indentation.
Mixing indentation levels within the same block.
Format and behavior notes
YAML indentation defines structure; tabs are not allowed.
Lists use dash notation (-) aligned with their parent key.
Related Tools
Frequently Asked Questions
What does the YAML validator check?
The validator checks for proper YAML syntax including correct indentation, key-value pair formatting, list syntax, and proper escaping.
Why is indentation important in YAML?
YAML uses indentation to define structure. Incorrect indentation will cause validation errors. Use consistent spacing (typically 2 spaces per level).
Can I validate YAML with anchors and aliases?
Yes, the validator supports YAML anchors and aliases, as long as they are properly defined and referenced.