Rumdl Explained

Rumdl is a tool that checks and fixes Markdown files to ensure they follow consistent formatting rules. Think of it like a spell-checker or grammar tool, but for Markdown documents. It scans your .md files, finds issues like inconsistent heading styles, improper spacing, or missing alt text on images, and can automatically fix many of them.

The main appeal is speed. Rumdl is written in Rust (a fast programming language), so it works significantly faster than competing tools like markdownlint. It has 57 built-in rules covering common Markdown problems—things like proper heading hierarchy, list formatting, line length limits, and code block syntax. You can run it once with rumdl check . to find problems, or use rumdl fmt . to automatically fix them. It also works with your code editor in real time, so you get feedback as you type.

You'd use this if you maintain documentation, write a lot of Markdown (READMEs, blogs, wikis), or want to enforce consistent style across a team's docs. For example, a startup might run rumdl in their CI/CD pipeline to catch formatting issues before merging docs updates, or a technical writer could use the VS Code plugin to get instant feedback while editing. It's easy to configure—you can disable rules you don't care about, set your own line-length limits, and support multiple Markdown "flavors" (GitHub, MkDocs, Quarto) so it understands variant syntax without false alarms.

The tool is also very accessible. You can install it via Cargo (Rust's package manager), pip (for Python users), Homebrew, or just download a standalone binary. There's no runtime dependencies—it's a single file that works immediately. It integrates well with existing workflows: pre-commit hooks, GitHub Actions, Vim, VS Code, JetBrains IDEs, and more. The README is thorough and the project seems actively maintained, with clear documentation on rules, configuration, and flavors.