# Route Data Reference

Starlight’s route data object contains information about the current page.
Learn more about how Starlight’s data model works in the [“Route Data” guide](/guides/guides-route-data).

In Astro components, access route data from `Astro.locals.starlightRoute`:

```astro {4}
---
// src/components/Custom.astro

const { hasSidebar } = Astro.locals.starlightRoute;
---
```

In [route middleware](/guides/guides-route-data#customizing-route-data), access route data from the context object passed to your middleware function:

```ts {5}
// src/routeData.ts
import { defineRouteMiddleware } from '@astrojs/starlight/route-data';

export const onRequest = defineRouteMiddleware((context) => {
	const { hasSidebar } = context.locals.starlightRoute;
});
```

## `starlightRoute`

The `starlightRoute` object has the following properties:

### `dir`

**Type:** `'ltr' | 'rtl'`

Page writing direction.

### `lang`

**Type:** `string`

BCP-47 language tag for this page’s locale, e.g. `en`, `zh-CN`, or `pt-BR`.

### `locale`

**Type:** `string | undefined`

The base path at which a language is served. `undefined` for root locale slugs.

### `siteTitle`

**Type:** `string`

The site title for this page’s locale.

### `siteTitleHref`

**Type:** `string`

The value for the site title’s `href` attribute, linking back to the homepage, e.g. `/`.
For multilingual sites this will include the current locale, e.g. `/en/` or `/zh-cn/`.

### `id`

**Type:** `string`

The slug for this page.

### `isFallback`

**Type:** `boolean | undefined`

`true` if this page is untranslated in the current language and using fallback content from the default locale.
Only used in multilingual sites.

### `entryMeta`

**Type:** `{ dir: 'ltr' | 'rtl'; lang: string }`

Locale metadata for the page content. Can be different from top-level locale values when a page is using fallback content.

### `entry`

The Astro content collection entry for the current page.
Includes frontmatter values for the current page at `entry.data`.

```ts
entry: {
	data: {
		title: string;
		description: string | undefined;
		// etc.
	}
}
```

Learn more about the shape of this object in [Astro’s Collection Entry Type](https://docs.astro.build/en/reference/modules/astro-content/#collectionentry) reference.

### `sidebar`

**Type:** `Array<[SidebarLink](#sidebarlink-type) | [SidebarGroup](#sidebargroup-type)>`

Site navigation sidebar entries for this page.
Each entry is either a sidebar link or a sidebar group.

#### `SidebarLink` type

Sidebar link entries represent a link rendered in the sidebar and have the following properties:

##### `type`

**Type:** `'link'`

The type identifying this entry as a sidebar link.

##### `label`

**Type:** `string`

The text of the link.

##### `href`

**Type:** `string`

The URL that the link points to.

##### `isCurrent`

**Type:** `boolean`

`true` if the link points to the current page.

##### `attrs`

**Type:** `Record<string, string | number | boolean | undefined>`

HTML attributes added to the rendered `<a>` element.

##### `badge`

**Type:** `{ text: string; variant: 'note' | 'danger' | 'success' | 'caution' | 'tip' | 'default'; class?: string } | undefined`

Badge configuration to render next to the link label, if any.
See the [`<Badge>` component props reference](/guides/components-badges#badge-props) for details.

##### `autogenerate`

**Type:** `{ directory: string } | undefined`

For links created from an [autogenerated sidebar entry](/guides/guides-sidebar#autogenerated-links), `directory` matches the configured [`autogenerate.directory`](/guides/reference-configuration#sidebar) value.

When the [`sidebar`](/guides/reference-configuration#sidebar) is not configured, Starlight generates entries for all documentation pages and uses an empty string (`''`) as the `directory` value.

#### `SidebarGroup` type

Sidebar group entries represent a group of links rendered in the sidebar and have the following properties:

##### `type`

**Type:** `'group'`

The type identifying this entry as a sidebar group.

##### `label`

**Type:** `string`

The text of the group.

##### `entries`

**Type:** `Array&lt;[SidebarLink](#sidebarlink-type) | [SidebarGroup](#sidebargroup-type)&gt;`

The nested sidebar entries within this group, which can be either links or groups.

##### `collapsed`

**Type:** `boolean`

Whether the group is collapsed by default.

##### `badge`

**Type:** `{ text: string; variant: 'note' | 'danger' | 'success' | 'caution' | 'tip' | 'default'; class?: string } | undefined`

Badge configuration to render next to the group label, if any.
See the [`<Badge>` component props reference](/guides/components-badges#badge-props) for details.

##### `autogenerate`

**Type:** `{ directory: string } | undefined`

For groups created from an [autogenerated sidebar entry](/guides/guides-sidebar#autogenerated-links), `directory` matches the configured [`autogenerate.directory`](/guides/reference-configuration#sidebar) value.

When the [`sidebar`](/guides/reference-configuration#sidebar) is not configured, Starlight generates entries for all documentation pages and uses an empty string (`''`) as the `directory` value.

### `hasSidebar`

**Type:** `boolean`

Whether or not the sidebar should be displayed on this page.

### `pagination`

**Type:** `{ prev?: Link; next?: Link }`

Links to the previous and next page in the sidebar if enabled.

### `toc`

**Type:** `{ minHeadingLevel: number; maxHeadingLevel: number; items: TocItem[] } | undefined`

Table of contents for this page if enabled.

### `headings`

**Type:** `{ depth: number; slug: string; text: string }[]`

Array of all Markdown headings extracted from the current page.
Use [`toc`](#toc) instead if you want to build a table of contents component that respects Starlight’s configuration options.

### `lastUpdated`

**Type:** `Date | undefined`

JavaScript `Date` object representing when this page was last updated if enabled.

### `editUrl`

**Type:** `URL | undefined`

`URL` object for the address where this page can be edited if enabled.

### `head`

**type:** [`HeadConfig[]`](/guides/reference-configuration#headconfig)

Array of all tags to include in the `<head>` of the current page.
Includes important tags such as `<title>` and `<meta charset="utf-8">`.

## Utilities

### `defineRouteMiddleware()`

Use the `defineRouteMiddleware()` utility to help type your route middleware module:

```ts "defineRouteMiddleware"
// src/routeData.ts
import { defineRouteMiddleware } from '@astrojs/starlight/route-data';

export const onRequest = defineRouteMiddleware((context) => {
	// ...
});
```

### `StarlightRouteData` type

If you are writing code that needs to work with Starlight’s route data, you can import the `StarlightRouteData` type to match the shape of `Astro.locals.starlightRoute`.

In the following example, a `usePageTitleInTOC()` function updates route data to use the current page’s title as the label for the first item in the table of contents, replacing the default “Overview” label.
The `StarlightRouteData` type allows you to check whether the route data changes are valid.

```ts "StarlightRouteData"
// src/route-utils.ts
import type { StarlightRouteData } from '@astrojs/starlight/route-data';

export function usePageTitleInTOC(starlightRoute: StarlightRouteData) {
	const overviewLink = starlightRoute.toc?.items[0];
	if (overviewLink) {
		overviewLink.text = starlightRoute.entry.data.title;
	}
}
```

This function can then be called from a route middleware:

```ts {3,6}
// src/route-middleware.ts
import { defineRouteMiddleware } from '@astrojs/starlight/route-data';
import { usePageTitleInTOC } from './route-utils';

export const onRequest = defineRouteMiddleware((context) => {
	usePageTitleInTOC(context.locals.starlightRoute);
});
```

## Related pages

- [Starlight](../index.md)
- [Using Components](./components-using-components.md)
- [Pages](./guides-pages.md)
- [Not found](./more-404.md)
- [Configuration Reference](./reference-configuration.md)
- [Plugins and Integrations](./resources-plugins.md)
- [Start Here](./start-here-index.md)
- [Getting Started](./start-here-getting-started.md)
- [Cards](./components-cards.md)
- [Guides](./guides-index.md)

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