useSelectedLayoutSegment

'use client'
 
import { useSelectedLayoutSegment } from 'next/navigation'
 
export default function ExampleClientComponent() {
  const segment = useSelectedLayoutSegment()
 
  return <p>Active segment: {segment}</p>
}

'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>
  )
}

// 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>
  )
}