YAML Validator
Validate YAML syntax and get the line and column of any error. Free and private: runs in your browser.
Paste YAML to catch indentation mistakes, tabs, unclosed brackets and duplicate keys before your deployment fails.
Runs entirely in your browser. Nothing you paste is uploaded or stored.
Use cases
- Find a syntax error before the build or deploy fails.
- Check config files in code review.
- Learn the rules your linter enforces.
Frequently asked questions
Why does YAML fail on tabs?
The YAML specification forbids tabs for indentation. Use spaces only, usually two per level.
Is the YAML Validator free?
Yes. It is free with no sign-up, and it runs entirely in your browser, so your input is never uploaded or stored.
What should I do with the issues it reports?
Fix high-severity items first; they usually break builds or deployments. Lower-severity items are style and best-practice suggestions.
Related tools
Checking one snippet is a start. Scan your whole repository for free with CodeInspector.