Next.js

Prerequisite

Before continuing, make sure you have configured:

Next.js 16.
Tailwind CSS 4.

We will use Fumadocs MDX as a content source, you can configure it first:

Installation

npm i fumadocs-mdx fumadocs-core @types/mdx

Create the configuration file:

source.config.ts

import { defineDocs, defineConfig } from 'fumadocs-mdx/config';

export const docs = defineDocs({
  dir: 'content/docs',
});

export default defineConfig();

Add the plugin to Next.js config:

next.config.mjs

import { createMDX } from 'fumadocs-mdx/next';

/** @type {import('next').NextConfig} */
const config = {
  reactStrictMode: true,
};

const withMDX = createMDX({
  // customize the config file path
  // configPath: "source.config.ts"
});

export default withMDX(config);

ESM Only

Fumadocs MDX is ESM-only, it's recommended to use next.config.mjs for accurate ESM resolution.

For TypeScript config file, it requires Native Node.js TypeScript Resolver, you can see Next.js docs for details.

Setup an import alias (recommended):

tsconfig.json

{
  "compilerOptions": {
    "paths": {
      "collections/*": ["./.source/*"]
    }
  }
}

Integrate with Fumadocs

You can create a lib/source.ts file and obtain Fumadocs source from the docs collection output.

lib/source.ts

import { docs } from 'collections/server';
import { loader } from 'fumadocs-core/source';

export const source = loader({
  baseUrl: '/docs',
  source: docs.toFumadocsSource(),
});

The .source folder will be generated when you run next dev or next build.

Done

You can now write content in content/docs folder.

Good to Know

Fumadocs also supports other content sources, including Content Collections and headless CMS.

Getting Started

npm i fumadocs-ui fumadocs-core

Root Layout

Wrap the entire application inside Root Provider, and add required styles to body.

app/layout.tsx

import { RootProvider } from 'fumadocs-ui/provider/next';
import type { ReactNode } from 'react';

export default function Layout({ children }: { children: ReactNode }) {
  return (
    <html lang="en" suppressHydrationWarning>
      <body
        // required styles
        className="flex flex-col min-h-screen"
      >
        <RootProvider>{children}</RootProvider>
      </body>
    </html>
  );
}

Styles

Add the following Tailwind CSS styles to global.css.

global.css

@import 'tailwindcss';
@import 'fumadocs-ui/css/neutral.css';
@import 'fumadocs-ui/css/preset.css';

It doesn't come with a default font, you may choose one from next/font.

Routes

Create a lib/layout.shared.tsx file to put the shared options for our layouts.

lib/layout.shared.tsx

import type { BaseLayoutProps } from 'fumadocs-ui/layouts/shared';

export function baseOptions(): BaseLayoutProps {
  return {
    nav: {
      title: 'My App',
    },
  };
}

Create the following files & routes:

import defaultMdxComponents from 'fumadocs-ui/mdx';
import type { MDXComponents } from 'mdx/types';

export function getMDXComponents(components?: MDXComponents) {
  return {
    ...defaultMdxComponents,
    ...components,
  } satisfies MDXComponents;
}

export const useMDXComponents = getMDXComponents;

declare global {
  type MDXProvidedComponents = ReturnType<typeof getMDXComponents>;
}

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Finish

You can start the dev server and create MDX files.

content/docs/index.mdx

---
title: Hello World
---

## Introduction

I love Anime.

On this page