Why MDX is Perfect for Developer Documentation

If you're writing developer documentation in 2025, MDX should be your go-to format. It combines the simplicity of Markdown with the full power of React components, enabling documentation experiences that were previously impossible.

What is MDX?#

MDX is Markdown for the component era. It lets you write JSX directly in your Markdown files, seamlessly blending content and interactivity.

Here's an example of what MDX looks like:

# Welcome to Our API
 
Here's a live example you can try:
 
[ApiPlayground endpoint="/users" method="GET" /]
 
Pretty cool, right?

The result? Documentation that's easy to write but can include interactive code playgrounds, dynamic examples, and custom UI components.

Benefits of MDX for Documentation#

1. Familiar Syntax#

If you know Markdown, you already know 90% of MDX. All standard Markdown syntax works:

• Headers, lists, and links
• Code blocks with syntax highlighting
• Images and tables
• Blockquotes and emphasis

The learning curve is minimal for your documentation team.

2. Reusable Components#

Create custom components once, use them everywhere. For example, you can create:

Callout components for warnings and tips:

[Callout type="warning"]
  This endpoint is deprecated. Use /v2/users instead.
[/Callout]

Tabs for showing code in multiple languages:

[Tabs items={['JavaScript', 'Python', 'Go']}]
  [Tab] fetch('/api/users') [/Tab]
  [Tab] requests.get('/api/users') [/Tab]
  [Tab] http.Get("/api/users") [/Tab]
[/Tabs]

3. Type Safety#

With TypeScript, you can enforce props on your documentation components:

interface ApiEndpointProps {
  method: 'GET' | 'POST' | 'PUT' | 'DELETE';
  path: string;
  description: string;
}

This prevents documentation errors before they ship.

4. Dynamic Content#

MDX can import and render data dynamically. You can import version numbers, configuration values, or any other data and embed it directly in your documentation. No more manually updating version numbers across docs.

Common MDX Components for Docs#

Here are components we recommend building for any documentation site. If you'd like to see what authoring these feels like in a live editor, watch this short tour of slash commands for callouts, tabs, and steps:

Callouts#

Highlight important information with different severity levels:

• Info callouts for helpful tips
• Warning callouts for deprecation notices
• Danger callouts for destructive actions

Code Blocks with Line Highlighting#

Show exactly what's important by highlighting specific lines in code examples. This helps readers focus on the relevant parts of longer code snippets.

API Reference Tables#

Create consistent formatting for API parameters with columns for:

• Parameter name
• Type (string, number, boolean, etc.)
• Required/optional status
• Description

Steps Components#

Guide users through processes with numbered steps that include:

• Clear step titles
• Detailed instructions
• Code examples where needed

Getting Started with MDX#

The easiest way to start using MDX for documentation is with a tool like Dokly. It handles all the MDX processing, provides pre-built components, and gives you a beautiful output out of the box.

If you're building from scratch, you'll need:

1. An MDX processor (like @mdx-js/mdx)
2. A bundler plugin for your framework
3. Custom components for your documentation needs

Conclusion#

MDX bridges the gap between simple Markdown and fully custom documentation platforms. You get the ease of Markdown with unlimited extensibility through React components.

Whether you're documenting an API, a library, or a product, MDX gives you the tools to create documentation that truly serves your users.

Ready to get started? Try Dokly free and see how easy documentation can be.