YAML Tools
YAML Validator
Validate YAML configs and see parse errors with exact location.
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What is YAML Validator?
The YAML Validator checks whether your YAML is syntactically valid. Invalid YAML produces a human-readable error message — far more helpful than a generic crash in kubectl or docker-compose.
How it works
We use js-yaml to parse the input. On success, the parsed document is shown formatted. On failure, js-yaml's error message with context is displayed.
- Paste YAML. Paste or drop a .yaml file.
- Review. A valid/invalid badge and optional formatted preview appear instantly.
- Fix and re-paste. Edit your YAML and the validator re-checks on every keystroke.
Examples
Catch a missing colon
Paste `key value` instead of `key: value` and see the exact parse error.
Common mistakes
Tabs instead of spaces
YAML is whitespace-sensitive. Tabs cause parse errors — use spaces only.
Alternatives
YAML Formatter
If your YAML is valid and you just want it pretty-printed, use the Formatter.
Frequently asked questions
Does it validate against a schema?
No — this checks YAML syntax only. For schema validation against a specific API spec, use a dedicated tool.