Paste YAML and click Validate & Format to check it parses correctly and re-print it in normalized YAML, or Convert to JSON to see the equivalent JSON. Errors show the line where parsing failed.
All tools/Formatting
YAML Formatter & Validator
Validate YAML and re-serialize it cleanly, or convert it to JSON. Runs entirely in your browser.
Output
How this works & FAQ
Is my data uploaded anywhere?
No. Parsing happens locally in your browser using the js-yaml library, loaded once from a CDN — your YAML content itself is never sent anywhere.
Why does it say my YAML is invalid?
Common causes: inconsistent indentation (YAML is whitespace-sensitive), tabs instead of spaces, or missing colons after keys.