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Using our custom components

Astro Docs uses several custom components that are available for use in any .mdx files. Note that these components cannot be used for docs that live in the astro core repo (e.g. configuration reference, error reference docs). Be sure to always check a preview of your components in the browser to ensure they are rendering properly.

Aside Component

Sometimes in documentation you want to provide information that is complementary but not strictly part of the current text or call out something that is particularly important. For example, maybe you want to include a tip that isn’t essential but could be helpful or warn a reader about a potential pitfall.

For these use cases you can use our aside component. This is an accessible component, based on the recommended markup from the BBC’s GEL design system.

The component has note, tip, caution and danger variants with colour, iconography, and default labelling distinct for each.

You can use a simple custom syntax to use the component in Markdown and also avoid needing to import it in the frontmatter all the time.

It’s best to avoid using `<blockquote>` for things that aren’t quotes.

The syntax also supports custom titles for the asides:

Using `<blockquote>` for notes is deprecated.

You can see all three currently-used styles (we don’t have any “danger” yet!) in action on the Astro Components Page.

Badge Component

Sometimes it is helpful to add a small badge to some content to label or highlight it. You can use the <Badge /> component for this.

Badges work best when they only contain a single word or — at a push — two words. Think of them as a tag or label for something, not a way to highlight longer passages of text.

import Badge from '~/components/Badge.astro';

By default, the badge uses a muted colour scheme to blend in. It also has an accented variant that can be used if you need it to stand out more from the surrounding context:

<Badge variant="accent">Wow!</Badge>


Since Component

As features are added to Astro, it can be helpful to document when they were added. This allows users to easily see if the version of Astro (or other packages) they are running supports a specific feature as described in the docs.

You can use the <Since /> component to display this information in a standardized way.

This component takes two props:

  • A v prop, which indicates the version of the package in which the feature was added.
  • A pkg prop, which indicates which package is being documented. This is optional and will default to 'astro' so is only required when using <Since /> for other packages.
import Since from '~/components/Since.astro';
<p><Since v="1.0.0" /></p>

This will render the text “Added in: astro@1.0.0”.

The advantages of using the component include:

  • “Added in” is automatically translated on pages in other languages.
  • The passed version is checked against the current package version and “NEW” or “BETA” badges will be added automatically based on data from npm.


The standard usage of this component is on its own line, immediately following the feature’s heading, for example:

## `Astro.clientAddress`
<p><Since v="1.0.0-rc" /></p>
Specifies the IP address of the request. This property is only available when building for SSR (server-side rendering) and should not be used for static sites.

Or, it can be used in a short block of information, for example:

### ``
Type: `string | boolean`
Default: `false`
<Since v="0.24.0" />

Setting a custom package name helps us document integrations and other packages. For example:

<Since v="2.1.0" pkg="@astrojs/rss" />

Version Component

Sometimes it may be useful to display the latest version of a package on a page. For this, you can use the <Version /> component, which must receive a valid package name from the npm registry as its pkgName prop.

Astro's latest version: <Version pkgName="astro" />

This will render Astro’s latest version: v1.2.1.

The <Version /> component is currently used in our Integrations pages as a way to keep each integration’s version up-to-date without having to merge changes to these pages directly. It’s worth noting that this component is only updated at build-time, thus a package’s version will not change until the site is rebuilt, be it manually or because a new PR was merged into main.

Tabs Component

Astro Docs uses a <Tabs> component to allow readers to choose between different content views.

There are also two variants of this component, <PackageManagerTabs> and <UIFrameworkTabs>, for our most common use cases where readers might be interested in only one of several instructions or code samples: package managers and UI frameworks. Other custom components may be added over time. You can find all existing Tabs variations in src/components/tabs/.

Note that these components share state, so if a reader changes the active tab of one <PackageManagerTabs> or <UIFrameworkTabs> component, then all other instances of this component on the same page will also change. This allows the reader to see the same content choice by default while reading through the entire page.


To use an existing Tabs component (e.g. <PackageManagerTabs> , <UIFrameworkTabs>), import it in the .mdx file:

import InstallGuideTabGroup from '~/components/TabGroup/InstallGuideTabGroup.astro';
import PackageManagerTabs from '~/components/tabs/PackageManagerTabs.astro'

Then, create a <Fragment> for each tab. The fragment’s slot name will identify the tab label and the content between the opening and closing <Fragment>...</Fragment> tags will be the panel content.

Here is an example of <PackageManagerTabs> showing the create astro commands from our Automatic Astro Installation page.

<Fragment slot="npm">
# create a new project with npm
npm create astro@latest
<Fragment slot="pnpm">
# create a new project with pnpm
pnpm create astro@latest
<Fragment slot="yarn">
# create a new project with yarn
yarn create astro

Creating your own custom Tabs component variation

If necessary, you can also create your own custom Tabs component using the base Tabs.tsx component. To do this, create a new Astro component in the src/components/tabs directory, e.g. MyCustomTabs.astro. (Do not use <Tabs> directly in a Markdown page. Create your own component instead.)

Inside MyCustomTabs.jsx, import the Tabs component and create one <Tabs> component. Be sure to include the client:visible directive and give a unique name to the sharedStore. Each created Tabs component should have its own sharedStore to avoid unrelated tabs changing one another accidentally.

import Tabs from './Tabs';
<Tabs client:idle sharedStore="my-shared-store">

To create your custom tab component, follow the pattern below using a <Fragment> with a named slot for each tab and panel to be created. Note that you must define your tab names here (e.g. Preact, React, Solid, Svelte, Vue), but the content for each panel will be written when your custom component is imported and used in a Markdown page, as in the previous <PackageManagerTabs> example.

import Tabs from './Tabs';
<Tabs client:idle sharedStore="ui-frameworks">
<Fragment slot="tab.preact">Preact</Fragment>
<Fragment slot="tab.react">React</Fragment>
<Fragment slot="tab.solid">Solid</Fragment>
<Fragment slot="tab.svelte">Svelte</Fragment>
<Fragment slot="tab.vue">Vue</Fragment>
<Fragment slot="panel.preact"><slot name="preact" /></Fragment>
<Fragment slot="panel.react"><slot name="react" /></Fragment>
<Fragment slot="panel.solid"><slot name="solid" /></Fragment>
<Fragment slot="panel.svelte"><slot name="svelte" /></Fragment>
<Fragment slot="panel.vue"><slot name="vue" /></Fragment>

The tabs will be displayed in alphabetical order, according to the slot name (e.g. tab.* and panel.*). For custom ordering, you can prefix your slot names with numbers (e.g. tab.1.react, tab.2.preact).

Astro Docs uses a <RecipeLink> component for displaying links to recipes with consistent styling. This is helpful when some page content has one or more relevant recipes you want to link to.

<RecipeLink> takes a single slugs prop, which is an array of the slugs of the recipes you want to link to. A slug has no leading or trailing slash and should match the language of the page you are currently on. For example, use pt-br/recipes/captcha on a Brazilian Portuguese page and not en/recipes/captcha.

import RecipeLinks from "~/components/RecipeLinks.astro";
<RecipeLinks slugs={["en/recipes/captcha", "en/recipes/build-forms-api"]}/>

FileTree Component

Import and use the <FileTree /> Starlight component to produce collapsable file trees in docs. Use hyphens (-) at different tab depths to show the file structure.

Please remember to add a / at the end of a folder name!

import { FileTree } from '@astrojs/starlight/components';
### Example Project Tree
A common Astro project directory might look like this:
- public/
- robots.txt
- favicon.svg
- social-image.png
- src/
- components/
- Header.astro
- Button.jsx
- layouts/
- PostLayout.astro
- pages/
- posts/
- index.astro
- styles/
- global.css
- astro.config.mjs
- package.json
- tsconfig.json

Hightlighting is available by writing an item in bold. Inline comments may also be added.

- folder/
- file.js
- **highlighted-file.ts**
- file.astro With an inline comment too