YAML Validator
Paste YAML to validate syntax, detect indentation issues, and see exact line numbers for errors. Also formats to canonical style.
Output
How to use the YAML Validator
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Paste your YAML.
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Click Validate to check for errors.
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Fix issues and optionally reformat.
Why validate YAML?
YAML's significant whitespace makes it powerful but error-prone — one misaligned indent and your CI pipeline fails. This validator catches those issues and tells you exactly which line to fix. It can also reformat YAML to a consistent canonical style.
Key features
- Validate YAML syntax with exact error line numbers
- Detect common indentation mistakes
- Reformat to canonical YAML style
- All processing is local — your config stays private
Frequently asked questions
Does it catch all YAML errors?
It detects syntax errors, indentation problems, and common gotchas like tabs-vs-spaces and ambiguous mappings.
Can it convert between YAML and JSON?
Use the Data Converter for YAML ↔ JSON conversion. This tool focuses on validation and formatting.
Is my YAML uploaded?
No. Validation runs entirely in your browser.