rumdl

rumdl is a high performance command-line tool for linting and formatting Markdown files.

It checks for the headings, lists, links and code blocks content of a markdown file and reports rule names in the MDXXX format. A diff mode previews fixes before files change or applied and formatting, applies available fixes and may succeed with unresolved issues. Check mode returns a exit code for remaining violations in the document.

This tool discovers common markdownlint configuration files and adjusts rules for Markdown flavors such as MkDocs and MDX. Its language server applies configured checks inside editors, and pre-commit hooks or CI integrations run them against repository changes.

For developers, technical writers and documentation maintainers, rumdl helps keep Markdown files cleanly formatted and consistent across a project. It it is also useful for pre-commit checks after editing, before committing changes and catching formatting errors in the CI.