YAML (YAML Ain't Markup Language) is a human‑friendly data serialization standard for all programming languages. It is commonly used for configuration files, CI/CD pipelines, and data exchange where readability matters.

This tool parses your YAML input using a robust JavaScript parser (js-yaml). It checks for syntactic errors, reports the exact line and column where a problem occurs, and lets you reformat the document with consistent indentation.

Common mistakes include inconsistent indentation (mixing tabs and spaces), missing colons after keys, incorrect list syntax, or unclosed quotes. This validator pinpoints the problematic line, helping you fix issues quickly.

Yes. The underlying parser discards comments during processing. The formatted output will contain only the structured data without your original comments.

Absolutely. The tool supports multi‑document YAML (separated by ---). It will report the number of documents found and the first error encountered, if any.

No. All parsing and formatting happen directly in your browser. Your YAML data never leaves your computer.