Advanced SEO in Next.js

// app/blog/[slug]/page.tsx
import { Metadata } from 'next';

export async function generateMetadata({ params }): Promise<Metadata> {
  const post = await getPost(params.slug);

  return {
    title: post.title,
    description: post.excerpt,
    openGraph: {
      title: post.title,
      description: post.excerpt,
      images: [{ url: post.image, width: 1200, height: 630 }],
      type: 'article',
      publishedTime: post.publishedAt,
      authors: [post.author.name],
    },
    twitter: {
      card: 'summary_large_image',
      title: post.title,
      description: post.excerpt,
      images: [post.image],
    },
  };
}

// components/JsonLd.tsx
export function ArticleJsonLd({ post }) {
  const jsonLd = {
    '@context': 'https://schema.org',
    '@type': 'Article',
    headline: post.title,
    description: post.excerpt,
    image: post.image,
    datePublished: post.publishedAt,
    dateModified: post.updatedAt,
    author: {
      '@type': 'Person',
      name: post.author.name,
    },
  };

  return (
    <script
      type="application/ld+json"
      dangerouslySetInnerHTML={{ __html: JSON.stringify(jsonLd) }}
    />
  );
}

// Usage in page
<ArticleJsonLd post={post} />

// app/sitemap.ts
import { MetadataRoute } from 'next';

export default async function sitemap(): MetadataRoute.Sitemap {
  const posts = await getPosts();

  const blogEntries = posts.map((post) => ({
    url: `https://example.com/blog/${post.slug}`,
    lastModified: post.updatedAt,
    changeFrequency: 'weekly' as const,
    priority: 0.8,
  }));

  return [
    {
      url: 'https://example.com',
      lastModified: new Date(),
      changeFrequency: 'daily',
      priority: 1,
    },
    ...blogEntries,
  ];
}

// app/robots.ts
import { MetadataRoute } from 'next';

export default function robots(): MetadataRoute.Robots {
  return {
    rules: [
      { userAgent: '*', allow: '/', disallow: '/admin' },
      { userAgent: 'Googlebot', allow: '/' },
    ],
    sitemap: 'https://example.com/sitemap.xml',
  };
}