YAML validator
Validate YAML with duplicate keys, aliases, and unsafe tags disabled.
Check whether one YAML document is valid and safe to parse.
About this tool
The YAML validator checks syntax and confirms that the document fits the site's safe parsing rules. It accepts common maps, lists, text, numbers, booleans, dates, and null values, while refusing duplicate keys, aliases, recursive structures, custom object tags, and multiple documents. Use it to review application settings, CI configuration, or a small data file before another program reads it.