Introduction

What is this?

Fumadocs MDX is the official content source of Fumadocs. It parses frontmatter and is bundled with many MDX plugins for building a good documentation site.

This package must be used with Fumadocs

Installation

Install Dependencies

npm install fumadocs-mdx @types/mdx

Configuration

Add the plugin to your next.config.mjs file.

import { createMDX } from 'fumadocs-mdx/next';
 
const withMDX = createMDX();
 
/** @type {import('next').NextConfig} */
const config = {
  reactStrictMode: true,
};
 
export default withMDX(config);

It generates a .source folder once you start the dev server or start building the app. The folder contains all parsed files, you should add it to .gitignore.

ESM Only

The Next.js config must be a .mjs file since Fumadocs is ESM-only.

Configure Fumadocs MDX by creating a source.config.ts file.

source.config.ts

import { defineDocs } from 'fumadocs-mdx/config';
 
export const { docs, meta } = defineDocs({
  dir: '/content/docs',
});

Post Install

You can add a post install script to generate types before executing CLI tools (e.g. ESLint).

package.json

{
  "scripts": {
    "postinstall": "fumadocs-mdx"
  }
}

Resolve Files

To integrate with Fumadocs, create:

lib/source.ts

import { docs, meta } from '@/.source';
import { createMDXSource } from 'fumadocs-mdx';
import { loader } from 'fumadocs-core/source';
 
export const source = loader({
  baseUrl: '/docs',
  source: createMDXSource(docs, meta),
});

For more customisation options, check Source API.

Start Server

next dev

A .source folder should be created. You can log and see if it is loaded correctly.

See Pages Conventions to learn how to organize your pages.

Usages

Generally, you'll interact with Fumadocs MDX through the Source loader API. You can see the type definitions to find available properties.

To render the page, obtain the page from source and render the MDX component (page.data.body).

import { notFound } from 'next/navigation';
import { source } from '@/lib/source';
import defaultMdxComponents from 'fumadocs-ui/mdx';
 
const page = source.getPage(['slugs']);
if (!page) notFound();
 
const MDX = page.data.body;
 
// set your MDX components with `components` prop
<MDX components={{ ...defaultMdxComponents }} />;

Eventually, it will look like:

page.tsx (Fumadocs UI)

import { source } from '@/lib/source';
import {
  DocsPage,
  DocsBody,
  DocsTitle,
  DocsDescription,
} from 'fumadocs-ui/page';
import { notFound } from 'next/navigation';
import defaultMdxComponents from 'fumadocs-ui/mdx';
import { metadataImage } from '@/lib/metadata';
 
export default async function Page(props: {
  params: Promise<{ slug?: string[] }>;
}) {
  const params = await props.params;
  const page = source.getPage(params.slug);
  if (!page) notFound();
 
  const MDX = page.data.body;
 
  return (
    <DocsPage toc={page.data.toc} full={page.data.full}>
      <DocsTitle>{page.data.title}</DocsTitle>
      <DocsDescription>{page.data.description}</DocsDescription>
      <DocsBody>
        <MDX components={{ ...defaultMdxComponents }} />
      </DocsBody>
    </DocsPage>
  );
}
 
export async function generateStaticParams() {
  return source.generateParams();
}
 
export async function generateMetadata(props: {
  params: Promise<{ slug?: string[] }>;
}) {
  const params = await props.params;
  const page = source.getPage(params.slug);
  if (!page) notFound();
 
  return metadataImage.withImage(page.slugs, {
    title: page.data.title,
    description: page.data.description,
  });
}

FAQ

Built-in Properties

These properties are exported from MDX files by default.

Property	Description
`frontmatter`	Frontmatter
`toc`	Table of Contents
`structuredData`	Structured Data, useful for implementing search

MDX Plugins

See MDX Options.

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