YAML formatter and validator

How to use

Validate and format YAML, with an optional JSON preview.

1. Enter or select the source data.
2. Adjust only the options you need.
3. Run the tool, review the result, then copy or download it.

YAML needs indentation and type checks

YAML is readable, but indentation, colons, and dashes determine structure. Some parsers also interpret values such as yes/no or date-like strings as non-string types. After formatting, verify not only syntax but also the key hierarchy and value types expected by the consuming application.