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How does the Metadata API work in Next.js (static and generateMetadata)?

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01

Understand the problem

Declaring head tags from layouts/pages.

nextjsmetadataseogeneratemetadata
02

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03

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Export a static metadata object or an async generateMetadata() function from a layout/page; Next.js renders the corresponding

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04

Read the code

Static + dynamic metadata
// static (layout.tsx)
export const metadata = {
  title: { default: 'My Site', template: '%s | My Site' },
  description: 'Welcome',
};

// dynamic (blog/[slug]/page.tsx) — fetch deduped with the page
export async function generateMetadata({ params }) {
  const { slug } = await params;
  const post = await getPost(slug);
  return { title: post.title, openGraph: { images: [post.cover] } };
}
05

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