prmbr-image-mksaas/content/docs/markdown.mdx
2025-06-09 00:21:43 +08:00

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---
title: Markdown
description: How to write documents
---
## 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](https://github.github.com/gfm).
````md
# 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.
```mdx
[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.
```mdx
import { Component } from './component';
<Component name="Hello" />
```
see [MDX Syntax](https://mdxjs.com/docs/what-is-mdx/#mdx-syntax) to learn more.
### Cards
Useful for adding links, it is included by default.
```mdx
<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>
```
<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>
#### Icon
You can specify an icon to cards.
```mdx
import { HomeIcon } from 'lucide-react';
<Cards>
<Card icon={<HomeIcon />} href="/" title="Home">
Go back to home
</Card>
</Cards>
```
<Cards>
<Card icon={<HomeIcon />} href="/" title="Go back to home">
The home page of Fumadocs.
</Card>
</Cards>
#### Without href
```mdx
<Cards>
<Card title="Fetching, Caching, and Revalidating">
Learn more about `fetch` in Next.js.
</Card>
</Cards>
```
<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.
```mdx
<Callout>Hello World</Callout>
```
<Callout>Hello World</Callout>
#### Title
Specify a callout title.
```mdx
<Callout title="Title">Hello World</Callout>
```
<Callout title="Title">Hello World</Callout>
#### Types
You can specify the type of callout.
- `info` (default)
- `warn`
- `error`
```mdx
<Callout title="Title" type="error">
Hello World
</Callout>
```
<Callout title="Title" type="error">
Hello World
</Callout>
### Customise Components
See [all MDX components and available options](/docs/mdx).
## Headings
An anchor is automatically applied to each heading, it sanitizes invalid characters like spaces. (e.g. `Hello World` to `hello-world`)
```md
# Hello `World`
```
### TOC Settings
The table of contents (TOC) will be generated based on headings, you can also customise the effects of headings:
```md
# Heading [!toc]
This heading will be hidden from TOC.
# Another Heading [toc]
This heading will **only** be visible in TOC, you can use it to add additional TOC items.
Like headings rendered in a React component:
<MyComp />
```
### Custom Anchor
You can add `[#slug]` to customise heading anchors.
```md
# heading [#my-heading-id]
```
You can also chain it with TOC settings like:
```md
# heading [toc] [#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.
```mdx
---
title: Hello World
---
## Title
```
See [Page Conventions](/docs/page-conventions#frontmatter) for a list of properties available for frontmatter.
## Codeblock
Syntax Highlighting is supported by default using [Rehype Code](/docs/headless/mdx/rehype-code).
````mdx
```js
console.log('Hello World');
```
````
You can add a title to the codeblock.
````mdx
```js title="My Title"
console.log('Hello World');
```
````
### Highlight Lines
You can highlight specific lines by adding `[!code highlight]`.
````md
```tsx
<div>Hello World</div> // [\!code highlight]
<div>Hello World</div>
<div>Goodbye</div>
<div>Hello World</div>
```
````
### Highlight Words
You can highlight a specific word by adding `[!code word:<match>]`.
````md
```js
// [\!code word:config]
const config = {
reactStrictMode: true,
};
```
````
### Diffs
````mdx
```ts
console.log('hewwo'); // [\!code --]
console.log('hello'); // [\!code ++]
```
````
```ts
console.log('hewwo'); // [!code --]
console.log('hello'); // [!code ++]
```
### Tab Groups
You can use code blocks with the `<Tab />` component.
````mdx
import { Tab, Tabs } from 'fumadocs-ui/components/tabs';
<Tabs items={['Tab 1', 'Tab 2']}>
<Tab value='Tab 1'>
```ts
console.log('A');
```
</Tab>
<Tab value='Tab 2'>
```ts
console.log('B');
```
</Tab>
</Tabs>
````
> Note that you can add MDX components instead of importing them in MDX files.
<Tabs items={['Tab 1', 'Tab 2']}>
<Tab value='Tab 1'>
```ts
console.log('A');
```
</Tab>
<Tab value='Tab 2'>
```ts
console.log('B');
```
</Tab>
</Tabs>
### Using Typescript Twoslash
Write Typescript codeblocks with hover type information and detected types errors.
Not enabled by default. See [Twoslash](/docs/twoslash).
## Images
All built-in content sources handle images properly.
Images are automatically optimized for `next/image`.
```mdx
![Image](/image.png)
```
![Image](/images/docs/notebook.png)
## Optional
Some optional plugins you can enable.
### Math Equations
Write math equations with TeX.
````md
```math
f(x) = x * e^{2 pi i \xi x}
```
````
```math
f(x) = x * e^{2 pi i \xi x}
```
To enable, see [Math Integration](/docs/math).
### Package Install
Generate code blocks for installing packages via package managers (JS/Node.js).
````md
```package-install
npm i next -D
```
````
```package-install
npm i next -D
```
To enable, see [Remark Install](/docs/headless/mdx/install).
### More
You can see [a list of plugins](/docs/headless/mdx) supported by Fumadocs.