滋賀県 Webサイト制作会社

1.静的ページの場合

import type { Metadata } from 'next'
 
export const metadata: Metadata = {
  title: '...',
  description: '...',
}
 
export default function Page() {}

https://nextjs.org/docs/app/api-reference/functions/generate-metadata#the-metadata-object

2.動的ページの場合

import type { Metadata, ResolvingMetadata } from 'next'
 
type Props = {
  params: { id: string }
  searchParams: { [key: string]: string | string[] | undefined }
}
 
export async function generateMetadata(
  { params, searchParams }: Props,
  parent: ResolvingMetadata
): Promise<Metadata> {
  // read route params
  const id = (await params).id
 
  // fetch data
  const product = await fetch(`https://.../${id}`).then((res) => res.json())
 
  // optionally access and extend (rather than replace) parent metadata
  const previousImages = (await parent).openGraph?.images || []
 
  return {
    title: product.title,
    openGraph: {
      images: ['/some-specific-page-image.jpg', ...previousImages],
    },
  }
}
 
export default function Page({ params, searchParams }: Props) {}

https://nextjs.org/docs/app/api-reference/functions/generate-metadata#generatemetadata-function