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MDX is a format for writing Markdown content that can also include JSX components, JavaScript expressions, and ES module imports and exports. It is useful when ordinary prose needs to include reusable interface elements—such as an alert or chart—but it is more than Markdown with a few visual additions: MDX compiles to JavaScript.
What is MDX?
MDX combines familiar Markdown structures, such as headings and paragraphs, with JSX. Authors can place components in a document, use JavaScript expressions inside braces, and import or export JavaScript modules. The MDX project summarizes the idea as “MDX allows you to use JSX in your markdown content.” (MDX: What is MDX?)
That combination makes MDX useful for content that benefits from components: a guide might include a reusable warning box, while a report could embed a chart. The components must be available to the environment that processes or renders the MDX.
MDX is also a compilation step, not just a display format. The project describes it as “a language that’s compiled to JavaScript.” (MDX: Getting started) The core compiler can compile MDX to JavaScript and evaluate MDX code; integrations connect the format to bundlers and frameworks. (@mdx-js/mdx)
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How to choose an MDX setup
Begin with the toolchain the project already uses rather than selecting an integration in isolation. The official guide lists these package choices:
| Existing toolchain | MDX integration |
|---|---|
| esbuild or Bun | @mdx-js/esbuild |
| Rollup or Vite | @mdx-js/rollup |
| webpack or Next.js | @mdx-js/loader |
| No bundler | Node.js loader or core @mdx-js/mdx compiler |
These are the integrations named in the MDX getting-started guide; package and framework instructions can change, so check the current documentation for your versions before adopting them. The same guide says the official @mdx-js packages are ESM-only and its current requirement is Node.js 16 or later. (MDX: Getting started)
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Check the JSX runtime and component conventions
MDX needs a JSX runtime. React is the default in the documented setup, and the project documents configuration paths for Preact, Vue, Svelte, Solid, Emotion, and Theme UI as well. Choose a runtime that fits the application, then make sure components and examples follow that runtime’s conventions.
For example, React commonly uses className for CSS classes, while some other runtimes expect different conventions. An MDX example copied between environments may need adjustment. The integration, runtime, and components should be considered together, not as independent choices. (What is MDX?; Getting started)
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Decide who is allowed to author MDX
Whether authors are trusted is a core design decision, not a deployment detail. MDX can express JavaScript and JSX, so giving someone permission to submit MDX is not equivalent to letting them submit plain text or ordinary Markdown. If authors are not trusted, do not accept their MDX as safe input; see the security section below before choosing an architecture.
How MDX differs from ordinary Markdown
MDX does not accept every Markdown convention unchanged. Its syntax guide highlights several differences that matter when converting existing content or writing documentation for MDX authors. (MDX: What is MDX?)
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- JSX replaces HTML syntax. Use JSX-compatible component markup rather than assuming raw HTML will work as it does in a Markdown processor. Components are often written with self-closing tags when they have no children.
- Autolinks do not work. Angle-bracket text may be interpreted as JSX, so write an explicit Markdown link, such as
[MDX](https://mdxjs.com/), instead of relying on an autolink. - Indented code blocks do not work. Indentation is used for nested components, so use fenced code blocks for code examples.
- Literal angle brackets and braces may need escaping. If those characters are text rather than JSX or an expression, escape them using the syntax supported by the MDX guide.
These distinctions are especially important in migration: a file that looks like valid Markdown may need edits before an MDX compiler can parse it.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Why MDX needs a security boundary
The MDX project is explicit: “MDX is a programming language. If you trust your authors, that’s fine. If you don’t, it’s unsafe.” (MDX: Getting started) Treat authored MDX as executable input, not as harmless content simply because it is compiled or rendered on a server.
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The official guide warns against allowing random internet users to write MDX. It discusses iframe sandboxing and, for Node.js, stronger process or operating-system isolation as possible measures, while cautioning that security is difficult and an iframe alone may not provide complete assurance. These are not a simple, guaranteed fix; assess the threat model and isolate untrusted work accordingly.
A practical adoption path
- Identify the existing build environment. Match the integration to the project’s bundler or framework using the official getting-started guide, or consider the Node loader or core compiler if there is no bundler.
- Confirm runtime and version requirements. Choose a JSX runtime, verify the package’s ESM and Node.js requirements against the current guide, and check that the required components can be made available to MDX.
- Set authoring rules. Document the JSX conventions and Markdown differences your writers need, including explicit links, fenced code blocks, and valid JSX component syntax.
- Set the trust policy before accepting content. Limit author access to people you trust, or design and review a robust isolation approach before processing untrusted MDX.
- Validate against the current documentation. Follow the integration’s current package instructions and test representative content, including components and code examples, in the target runtime.
The MDX documentation index links to its syntax, integration, and package guides for a deeper implementation-specific reference: MDX documentation.
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