YAML Validator
Validate YAML online, catch syntax errors fast, and preview the parsed JSON output — all locally in your browser.
Validation Status
Ready to validate. Paste YAML and click Validate YAML.
Parsed JSON Preview
When the YAML is valid, the parsed JSON representation appears here.
What does this YAML validator do?
This YAML validator checks whether your YAML is syntactically correct and highlights parser errors with line and column details when available.
If the YAML is valid, the tool also shows the parsed JSON structure so you can quickly confirm that the data shape matches what you expected.
Common YAML mistakes this tool helps catch
- Bad indentation or inconsistent spacing
- Missing closing brackets in inline arrays or objects
- Invalid mapping syntax like missing colons
- Tabs mixed into indentation where spaces are expected
- Broken nested structures in config files, CI files, or Kubernetes manifests
Who is this for?
Developers, DevOps engineers, and anyone working with config files. If you touch GitHub Actions, Docker Compose, Kubernetes, Netlify, Vercel, or application settings, you probably deal with YAML regularly.
The tool is useful for quick validation before you commit a config change or paste a manifest into production tooling.
Is my YAML private?
Yes. Validation happens locally in your browser. Your YAML is not uploaded or stored on the server.