What YAML validation checks
YAML validation checks that a document follows YAML syntax and can be parsed into data. This validator uses the same YAML parser as the site’s YAML to JSON converter. It reports a parsing problem when possible and marks its line and column in the editor. A valid result means the text parses; it does not check whether values meet an application’s schema or configuration rules.
Common YAML syntax errors
Indentation defines structure in YAML, so keep nested keys aligned and use spaces rather than tabs. Check that quoted strings have a matching closing quote, and that brackets and braces are balanced. A colon followed by a space separates a mapping key from its value; quote values when punctuation or whitespace could make their meaning unclear.
The validator runs in this browser tab. The YAML text is parsed here and is not uploaded for validation. For conversion steps and details about how YAML values map to JSON, see the YAML to JSON guide.
Learn more about this YAML tool, or read the privacy details for information about browser-based processing.
YAML validator FAQ
Does “Valid YAML” mean my configuration will work?
No. It means the document parses as YAML and can be represented by this tool’s YAML-to-JSON conversion. Application-specific schema, required fields, and runtime behavior are outside this syntax check.
Why is an error line or column not always shown?
The parser reports a source location for many syntax errors. Some conversion errors do not point to one character, so the validator can show the message without marking a location.
Does this validator check my YAML against a schema?
No. It checks whether the text parses as YAML. It does not validate application schemas, required fields, or configuration-specific rules.
Is my YAML uploaded when I validate it?
No. The YAML is parsed locally in your browser and is not uploaded for validation.