MDX in Next.js: Markdown with Superpowers

WHY IT EXISTS Static content is easy to write with Markdown, but lacks interactivity. React apps are interactive, but writing long-form content in JSX is cumbersome. MDX was created to bridge this gap, offering the best of both worlds: a great writing experience and a powerful component model.

THE MENTAL MODEL MDX is a superset of Markdown that understands JSX. Imagine writing a blog post in a simple text file, but when you need a chart, you can just type <MyInteractiveChart /> right in the middle of a paragraph and have it render as a full-fledged React component.

HOW IT WORKS In a Next.js project, you install and configure the official @next/mdx package. This teaches Next.js how to parse files ending in .mdx as pages. When a user visits a route handled by an MDX file, Next.js processes it on the server, converting the Markdown to HTML and rendering any embedded React components.

WHEN TO USE IT Use MDX for content-driven pages that benefit from rich, interactive elements. Three key use cases are: first, technical blogs with live code editors or interactive diagrams; second, product documentation with embedded component examples; and third, marketing pages with animated graphics or data visualizations.

WHEN NOT TO USE IT Avoid MDX for pages that are purely application logic with minimal static content, like a settings dashboard or a complex form. For those, standard .js or .tsx files are more direct. If your content is truly just static text with no need for components, plain Markdown is simpler.

ONE CANONICAL EXAMPLE A blog post about stock market trends is written in an MDX file. Most of the article is standard Markdown text and images. In one section, the author embeds a <StockTickerChart symbol="TSLA" /> component. This component, defined in its own file and marked with 'use client', fetches and displays live data, making the static post interactive. The MDX file simply imports the chart component and renders it inline.