mdx-components.js

Last updated April 23, 2026

The mdx-components.js|tsx file is required to use @next/mdx with App Router and will not work without it. Additionally, you can use it to customize styles.

Use the file mdx-components.tsx (or .js) in the root of your project to define MDX Components. For example, at the same level as pages or app, or inside src if applicable.

mdx-components.tsx

JavaScriptTypeScript

import type { MDXComponents } from 'mdx/types'
 
const components: MDXComponents = {}
 
export function useMDXComponents(): MDXComponents {
  return components
}

Exports

useMDXComponents function

The file must export a single function named useMDXComponents. This function does not accept any arguments.

mdx-components.tsx

JavaScriptTypeScript

import type { MDXComponents } from 'mdx/types'
 
const components: MDXComponents = {}
 
export function useMDXComponents(): MDXComponents {
  return components
}

Version History

Learn more about MDX Components

[

MDX

Learn how to configure MDX and use it in your Next.js apps.

](../../../guides/mdx/index.md)

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