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---
title: useSelectedLayoutSegment
description: API Reference for the useSelectedLayoutSegment hook.
---
`useSelectedLayoutSegment` is a **Client Component** hook that lets you read the active route segment **one level below** the Layout it is called from.
It is useful for navigation UI, such as tabs inside a parent layout that change style depending on the active child segment.
```tsx filename="app/example-client-component.tsx" switcher
'use client'
import { useSelectedLayoutSegment } from 'next/navigation'
export default function ExampleClientComponent() {
const segment = useSelectedLayoutSegment()
return <p>Active segment: {segment}</p>
}
```
```jsx filename="app/example-client-component.js" switcher
'use client'
import { useSelectedLayoutSegment } from 'next/navigation'
export default function ExampleClientComponent() {
const segment = useSelectedLayoutSegment()
return <p>Active segment: {segment}</p>
}
```
> **Good to know**:
>
> - Since `useSelectedLayoutSegment` is a [Client Component](/docs/app/getting-started/server-and-client-components) hook, and Layouts are [Server Components](/docs/app/getting-started/server-and-client-components) by default, `useSelectedLayoutSegment` is usually called via a Client Component that is imported into a Layout.
> - `useSelectedLayoutSegment` only returns the segment one level down. To return all active segments, see [`useSelectedLayoutSegments`](/docs/app/api-reference/functions/use-selected-layout-segments)
## Parameters
```tsx
const segment = useSelectedLayoutSegment(parallelRoutesKey?: string)
```
`useSelectedLayoutSegment` _optionally_ accepts a [`parallelRoutesKey`](/docs/app/api-reference/file-conventions/parallel-routes#with-useselectedlayoutsegments), which allows you to read the active route segment within that slot.
## Returns
`useSelectedLayoutSegment` returns a string of the active segment or `null` if one doesn't exist.
For example, given the Layouts and URLs below, the returned segment would be:
| Layout | Visited URL | Returned Segment |
| ------------------------- | ------------------------------ | ---------------- |
| `app/layout.js` | `/` | `null` |
| `app/layout.js` | `/dashboard` | `'dashboard'` |
| `app/dashboard/layout.js` | `/dashboard` | `null` |
| `app/dashboard/layout.js` | `/dashboard/settings` | `'settings'` |
| `app/dashboard/layout.js` | `/dashboard/analytics` | `'analytics'` |
| `app/dashboard/layout.js` | `/dashboard/analytics/monthly` | `'analytics'` |
## Examples
### Creating an active link component
You can use `useSelectedLayoutSegment` to create an active link component that changes style depending on the active segment. For example, a featured posts list in the sidebar of a blog:
```tsx filename="app/blog/blog-nav-link.tsx" switcher
'use client'
import Link from 'next/link'
import { useSelectedLayoutSegment } from 'next/navigation'
// This *client* component will be imported into a blog layout
export default function BlogNavLink({
slug,
children,
}: {
slug: string
children: React.ReactNode
}) {
// Navigating to `/blog/hello-world` will return 'hello-world'
// for the selected layout segment
const segment = useSelectedLayoutSegment()
const isActive = slug === segment
return (
<Link
href={`/blog/${slug}`}
// Change style depending on whether the link is active
style={{ fontWeight: isActive ? 'bold' : 'normal' }}
>
{children}
</Link>
)
}
```
```jsx filename="app/blog/blog-nav-link.js" switcher
'use client'
import Link from 'next/link'
import { useSelectedLayoutSegment } from 'next/navigation'
// This *client* component will be imported into a blog layout
export default function BlogNavLink({ slug, children }) {
// Navigating to `/blog/hello-world` will return 'hello-world'
// for the selected layout segment
const segment = useSelectedLayoutSegment()
const isActive = slug === segment
return (
<Link
href={`/blog/${slug}`}
// Change style depending on whether the link is active
style={{ fontWeight: isActive ? 'bold' : 'normal' }}
>
{children}
</Link>
)
}
```
```tsx filename="app/blog/layout.tsx" switcher
// Import the Client Component into a parent Layout (Server Component)
import { BlogNavLink } from './blog-nav-link'
import getFeaturedPosts from './get-featured-posts'
export default async function Layout({
children,
}: {
children: React.ReactNode
}) {
const featuredPosts = await getFeaturedPosts()
return (
<div>
{featuredPosts.map((post) => (
<div key={post.id}>
<BlogNavLink slug={post.slug}>{post.title}</BlogNavLink>
</div>
))}
<div>{children}</div>
</div>
)
}
```
```jsx filename="app/blog/layout.js" switcher
// Import the Client Component into a parent Layout (Server Component)
import { BlogNavLink } from './blog-nav-link'
import getFeaturedPosts from './get-featured-posts'
export default async function Layout({ children }) {
const featuredPosts = await getFeaturedPosts()
return (
<div>
{featuredPosts.map((post) => (
<div key={post.id}>
<BlogNavLink slug={post.slug}>{post.title}</BlogNavLink>
</div>
))}
<div>{children}</div>
</div>
)
}
```
## Version History
| Version | Changes |
| --------- | -------------------------------------- |
| `v13.0.0` | `useSelectedLayoutSegment` introduced. |
|