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YAML validation guide
Paste YAML into the validator above when a configuration file fails to load or before committing a deployment change. The parser checks the document structure and reports syntax errors locally in the browser. This tool is free to use. No account or payment is required.
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Validation asks the YAML parser to build a complete document. Problems such as malformed indentation, invalid collections, and duplicate mapping keys are surfaced as syntax errors instead of being accepted as plain text.
A valid YAML result means the document parses. It does not prove that Kubernetes, GitHub Actions, Docker Compose, or another application accepts every key or value in its own schema.
Checking syntax first gives configuration debugging a clean boundary. If the YAML is valid, move on to the schema or application-specific rule that consumes it. If parsing fails, fix the YAML document before debugging downstream behavior.
The parser is loaded into the browser and receives the input locally. VetaTool does not need to upload environment values, internal hostnames, deployment settings, or other YAML content to validate its syntax.
A mapping with one consistent indentation level parses successfully and returns a direct validation result.
service:
name: api
enabled: trueValid YAMLCommon questions
It means the YAML parser accepted the document syntax. Application-specific schema validation is a separate step.
Yes. The parser is configured to treat duplicate mapping keys as errors rather than silently choosing one value.
No. The YAML parser runs locally in your browser and validates the supplied text there.
Debugging a specific YAML issue? Browse YAML troubleshooting.