YAML Validator
Validate YAML and YML syntax, indentation, mappings, sequences, aliases, and duplicate keys with readable error details.
Valid YAML
YAML input
Validated output
Catch YAML mistakes early
YAML is whitespace-sensitive, so a small indentation error can change or invalidate a configuration. The validator uses strict YAML parsing and returns a normalized view when the document is valid.
Frequently Asked Questions
What YAML problems can this validator detect?+
It detects malformed indentation, invalid collections, duplicate keys, broken aliases, and other YAML 1.2 syntax errors.
Does valid YAML guarantee that my application accepts it?+
No. Applications may impose a schema or expect specific keys and value types beyond valid YAML syntax.
Are multiple YAML documents supported?+
This tool validates one YAML document at a time; split streams containing multiple document markers before checking them individually.
Related Tools
YAML FormatterFormat YAML mappings, sequences, flow collections, comments, anchors, and scalar values with consistent indentation.→JSON to YAMLConvert valid JSON objects, arrays, and scalar values into deterministic YAML 1.2 with safe quoted strings and keys.→JSON ValidatorFree online JSON syntax validator with precise line and column error reporting.→XML ValidatorCheck XML for mismatched tags, invalid attributes, malformed declarations, and other well-formedness errors with location details.→