YAML Validator — Syntax Check with Line & Column Errors
Validate YAML syntax instantly with precise line and column errors, boolean-coercion warnings, tab detection, and document stats. Multi-document files supported — all processing runs in your browser.
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YAML document
Validation
Waiting for inputAbout this tool
Line/column errorsWarningsMulti-documentJump to errorPrivate
How to use
- Paste or upload your YAML file.
- Validation runs automatically as you type.
- Fix syntax errors using line numbers and jump-to-error.
- Review warnings for tabs, duplicate keys, and YAML 1.1 booleans.
Examples
Indentation error
key: child: value
Error: bad indentation (line 2)