YAML Validator
Free online YAML validator tool, syntax error checking
What is YAML?
YAML (YAML Ain't Markup Language) is a human-readable data serialization format commonly used for configuration files, Docker Compose, Kubernetes manifests, CI/CD pipelines, and more. It uses indentation for structure and supports scalars, lists, and mappings.
How to Validate YAML
Paste your YAML content in the editor. The tool validates syntax in real time and highlights any errors. It shows statistics like line count and key count. Fix errors based on the error messages to produce valid YAML.
▶What are common YAML errors?
Common issues include inconsistent indentation (YAML requires consistent spaces, not tabs), missing colons after keys, unquoted special characters in strings, and incorrect list formatting.
▶Can I use tabs for YAML indentation?
No. YAML strictly requires spaces for indentation. Using tabs will cause parsing errors. Most editors can be configured to convert tabs to spaces automatically.