YAML validator
Check whether your YAML is valid and pinpoint syntax errors. Runs in your browser.
Runs 100% in your browser
Enter YAML above to validate it.
How to validate YAML
- Paste your YAML. Paste the YAML you want to check.
- See the result. A green check confirms valid YAML; an error shows the line and message.
About validating YAML
A single misplaced space or a tab where YAML expects spaces can silently change meaning or fail a deploy. Validating before you commit a CI config, Compose file or Kubernetes manifest saves a slow round-trip through the pipeline. Once it's valid, the YAML to JSON converter shows exactly how the document will be parsed.
Frequently asked questions
- It parses your YAML and confirms it is syntactically valid. If not, it reports the error message with the line and column so you can fix indentation or syntax issues.
- No. It checks YAML syntax (well-formedness), not whether the document matches a specific schema like a Kubernetes manifest or GitHub Actions workflow.
- YAML is indentation-sensitive and has subtle rules around tabs, colons and special characters. A validator catches these before they cause a confusing failure in your pipeline.
- Yes — validation runs in your browser; nothing is uploaded.