Markdown

Introduction

Fumadocs provides many useful extensions to MDX, a markup language. Here is a brief introduction to the default MDX syntax of Fumadocs UI.

MDX is not the only supported format of Fumadocs. In fact, you can use any renderers such as next-mdx-remote or CMS.

Markdown

We use GFM (GitHub Flavored Markdown), a superset of Markdown (CommonMark). See GFM Specification.

# Heading

## Heading

### Heading

#### Heading

Hello World, **Bold**, _Italic_, ~~Hidden~~

```js
console.log('Hello World');
```

1. First
2. Second
3. Third

- Item 1
- Item 2

> Quote here

![alt](/image.png)

| Table | Description |
| ----- | ----------- |
| Hello | World       |

Auto Links

Internal links use the next/link component to allow prefetching and avoid hard-reload.

External links will get the default rel="noreferrer noopener" target="_blank" attributes for security.

[My Link](https://github.github.com/gfm)

This also works: https://github.github.com/gfm.

MDX

MDX is a superset of Markdown, with support of JSX syntax. It allows you to import components, and use them right in the document, or even export values.

import { Component } from './component';

<Component name="Hello" />

See MDX Syntax to learn more.

Cards

Useful for adding links, it is included by default.

<Cards>
  <Card
    href="https://nextjs.org/docs/app/building-your-application/data-fetching/fetching-caching-and-revalidating"
    title="Fetching, Caching, and Revalidating"
  >
    Learn more about caching in Next.js
  </Card>
</Cards>

Without href

<Cards>
  <Card title="Fetching, Caching, and Revalidating">
    Learn more about `fetch` in Next.js.
  </Card>
</Cards>

Callouts

Useful for adding tips/warnings, it is included by default.

<Callout>Hello World</Callout>

Title

Specify a callout title.

<Callout title="Title">Hello World</Callout>

Types

You can specify the type of callout.

• info (default)
• warn
• error

<Callout title="Title" type="error">
  Hello World
</Callout>

Customise Components

See all MDX components and available options.

Headings

An anchor is automatically applied to each heading, it sanitizes invalid characters like spaces. (e.g. Hello World to hello-world)

# Hello `World`

Custom Anchor

You can add [#slug] to customise heading anchors.

# heading [#my-heading-id]

To link people to a specific heading, add the heading id to hash fragment: /page#my-heading-id.

Frontmatter

We support YAML frontmatter. It is a way to specify common information of the document (e.g. title). Place it at the top of document.

---
title: Hello World
---

## Title

Codeblock

Syntax Highlighting is supported by default using Rehype Code.

```js
console.log('Hello World');
```

You can add a title to the codeblock.

```js title="My Title"
console.log('Hello World');
```

Highlight Lines

You can highlight specific lines by adding [!code highlight].

```tsx
<div>Hello World</div>  
<div>Hello World</div>
<div>Goodbye</div>
<div>Hello World</div>
```

Highlight Words

You can highlight a specific word by adding [!code word:<match>].

```js
const config = {
  reactStrictMode: true,
};
```

Diffs

```ts
console.log('hewwo'); 
console.log('hello'); 
```

Tab Groups

You can use code blocks with the Tab component to organize content in tabs.

Note that you can add MDX components instead of importing them in MDX files.

Images

All built-in content sources handle images properly. Images are automatically optimized for next/image.

![Image](/image.png)

Optional

Some optional plugins you can enable.

Math Equations

Write math equations with TeX.

```math
f(x) = x * e^{2 pi i \xi x}
```

Package Install

Generate code blocks for installing packages via package managers (JS/Node.js).

```package-install
npm i next -D
```