YAML Validator
Instant, precise YAML validation with detailed error reporting. Catch syntax errors, duplicate keys, and type coercion issues before they reach production.
YAML Input
lines: 0characters: 0
Example:
Validation Results
Paste YAML to see validation results
Common YAML Error Categories
Indentation Errors
YAML uses spaces for indentation — never tabs. Inconsistent indentation is the most common error.
Duplicate Keys
Duplicate keys at the same level silently overwrite values. Our validator flags every occurrence.
Type Coercion
Values like 'yes', 'no', 'on', 'off' are interpreted as booleans. Quote them if you mean strings.
Special Characters
Colons, hashes, and brackets have special meaning in YAML. Wrap values containing them in quotes.