YAML Validator
YAMLValidate YAML syntax and get detailed error messages
All processing happens locally in your browser — your data never leaves your machine.
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Examples
Valid Object
Input
name: John Doe
age: 30
email: john@example.comOutput
Valid YAML — parsed as objectValid Array
Input
- apple
- banana
- cherryOutput
Valid YAML — parsed as arrayInvalid YAML
Input
name: John
invalid indentation
nested: wrongOutput
Error: bad indentation of a mapping entryFrequently Asked Questions
- What errors does the YAML Validator detect?
- The validator detects all YAML syntax errors including incorrect indentation, invalid mappings, duplicate keys, bad escape sequences, and malformed anchors or aliases. It provides the exact line and column where the error occurs.
- Does the YAML Validator support multi-document YAML?
- The validator checks the first document in a YAML stream using yaml.load(). For multi-document YAML files separated by ---, only the first document is validated. Each document can be validated separately by splitting them.
- Is my YAML data sent to a server for validation?
- No. All validation runs locally in your browser using JavaScript. Your YAML data never leaves your device, making it safe to validate sensitive configuration files.