✓ YAML Validator
Paste YAML and get a clear valid/invalid verdict, with a line-number pointer to the first problem found. Nothing leaves your browser.
Checks for: tabs used in indentation (YAML disallows tabs for indent), inconsistent/misaligned
indentation, unclosed single/double quotes, a
- list marker not followed by a space,
duplicate keys at the same mapping level, and unsupported constructs (anchors/aliases, tags,
flow-style { }/[ ] collections, multiple documents). It stops at and
reports the first problem — fix it and re-run to find the next one.