Best MDX Open Source Repositories

MDX combines Markdown with JSX, letting authors write standard Markdown for prose while embedding actual React components directly inside the same document. A heading or paragraph is written exactly as it would be in plain Markdown, but anywhere in the file you can drop in a live component, like an interactive code example, a chart, or a custom callout box, and it renders as a real part of the page rather than a static image or embedded iframe. Under the hood, MDX compiles to a React component, so the whole document becomes part of a normal React render tree.

This makes MDX especially useful for documentation sites that need more than static prose: interactive API examples, live-editable code playgrounds, or custom design system components embedded directly next to the text explaining them. It's become a common choice for component library documentation specifically, since it lets a library demonstrate its own components inline within the same page that describes how to use them, keeping examples and explanations in sync as the underlying components change.

Repos on this page using MDX include shadcn/ui's documentation, which relies on MDX to show live, interactive component examples alongside usage instructions, Storybook, which supports MDX as one of its documentation formats for component stories, and Next.js and Astro, both of which offer built-in MDX support for content-heavy sites that still need occasional custom interactive elements mixed into otherwise static pages.