{content.title}

--- layout: ~/layouts/Main.astro title: Markdown Content --- Astro comes with out-of-the-box Markdown support powered by the expansive [remark](https://remark.js.org/) ecosystem. ### Remark Plugins **This is the first draft of Markdown support!** While we plan to support user-provided `remark` plugins soon, our hope is that you won't need `remark` plugins at all! In addition to [custom components inside the `` component](https://github.com/snowpackjs/astro/blob/main/docs/markdown.md#markdown-component), Astro comes with [Github-flavored Markdown](https://github.github.com/gfm/) support, [Footnotes](https://github.com/remarkjs/remark-footnotes) syntax, [Smartypants](https://github.com/silvenon/remark-smartypants), and syntax highlighting via [Prism](https://prismjs.com/) pre-enabled. These features are likely to be configurable in the future. ### Markdown Pages Astro treats any `.md` files inside of the `/src/pages` directory as pages. These pages are processed as plain markdown files and do not support components. If you're looking to embed rich components in your markdown, take a look at the [Markdown Component](#astros-markdown-component) section. `layout` The only special Frontmatter key is `layout`, which defines the relative path to an `.astro` component which should wrap your Markdown content. `src/pages/index.md` ```jsx --- layout: ../layouts/main.astro --- # Hello World! ``` Layout files are normal `.astro` components. Any Frontmatter defined in your `.md` page will be exposed to the Layout component as the `content` prop. `content` also has an `astro` key which holds special metadata about your file, like the complete Markdown `source` and a `headings` object. Keep in mind that the only guaranteed variables coming from the `content` prop object are `astro` and `url`. An example of what a blog post `content` object might look like is as follows: ```json { /** Frontmatter from blog post "title": "", "date": "", "author": "", "description": "", **/ "astro": { "headers": [], "source": "" }, "url": "" } ``` The rendered Markdown content is placed into the default `` element. `src/layouts/main.astro` ```jsx --- const { content } = Astro.props; --- {content.title} ``` ### Astro's Markdown Component Astro has a dedicated component used to let you render your markdown as HTML components. This is a special component that is only exposed to `.astro` files. To use the `` component, within yout frontmatter block use the following import statement: ```jsx --- import { Markdown } from 'astro/components'; --- ``` You can utilize this within your `.astro` file by doing the following: ```jsx --- import { Markdown } from 'astro/components'; --- # Hello world! The contents inside here is all in markdown. ``` `` components provide more flexibility and allow you to use plain HTML or custom components. For example: ````jsx --- // For now, this import _must_ be named "Markdown" and _must not_ be wrapped with a custom component // We're working on easing these restrictions! import { Markdown } from 'astro/components'; import Layout from '../layouts/main.astro'; import MyFancyCodePreview from '../components/MyFancyCodePreview.tsx'; const expressions = 'Lorem ipsum'; --- # Hello world! **Everything** supported in a `.md` file is also supported here! There is _zero_ runtime overhead. In addition, Astro supports: - Astro {expressions} - Automatic indentation normalization - Automatic escaping of expressions inside code blocks ```jsx // This content is not transformed! const object = { someOtherValue }; ``` - Rich component support like any `.astro` file! - Recursive Markdown support (Component children are also processed as Markdown) ```jsx const object = { someOtherValue }; ``` ```` ### Remote Markdown If you have Markdown in a remote source, you may pass it directly to the Markdown component through the `content` attribute. For example, the example below fetches the README from Snowpack's Github repository and renders it as HTML. ```jsx --- import { Markdown } from 'astro/components'; const content = await fetch('https://raw.githubusercontent.com/snowpackjs/snowpack/main/README.md').then(res => res.text()); --- ``` There might be times when you want to combine both dynamic, and static markdown. If that is the case, you can nest `` components with each other to get the best of both worlds. ```jsx --- import { Markdown } from 'astro/components'; const content = await fetch('https://raw.githubusercontent.com/snowpackjs/snowpack/main/README.md').then(res => res.text()); --- ## Markdown example Here we have some __Markdown__ code. We can also dynamically render content from remote places. ``` ### Security FAQs **Aren't there security concerns to rendering remote markdown directly to HTML?** Yes! Just like with regular HTML, improper use of the `Markdown` component can open you up to a [cross-site scripting (XSS)](https://en.wikipedia.org/wiki/Cross-site_scripting) attack. If you are rendering untrusted content, be sure to _sanitize your content **before** rendering it_. **Why not use a prop like React's `dangerouslySetInnerHTML={{ __html: content }}`?** Rendering a string of HTML (or Markdown) is an extremely common use case when rendering a static site and you probably don't need the extra hoops to jump through. Rendering untrusted content is always dangerous! Be sure to _sanitize your content **before** rendering it_.