How do I validate YAML with line numbers?
Click Validate YAML. If parsing fails, you'll see the error plus line/column when available.
YAML Formatter & Validator
Format YAML, validate syntax with line-aware errors, and convert between YAML and JSON — all client-side in your browser.
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Ready.
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FAQ
Does this work offline?
Once loaded in your browser, all parsing and conversions run locally on your device.
Can this handle arrays and nested objects?
Yes. The tool supports common YAML and JSON structures, including nested arrays/objects.
Will my data be uploaded?
No. This page processes input client-side only.
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