5. Frontend Implementation in Next.js

5.1 Routing and URL preservation

Preserving URLs is a major SEO and trust requirement.

Routing goals

• Keep existing permalink structure where feasible
• Preserve trailing slash behavior consistently
• Support legacy paths with explicit redirects
• Avoid redirect chains during and after launch

Route strategy

• Use dynamic segments for posts and pages
• Add catch-all route for rare legacy patterns
• Map old slugs to new canonical routes via redirect table

Staging crawl and indexing safety

Make sure your staging environment is not indexed:

• Require authentication or IP allowlisting for staging access, when possible
• Use noindex and restrict crawling intentionally
• Verify canonical URLs and sitemap output are correct for the environment

5.2 Rendering strategy

Choose rendering per page type.

Typical approach

• Static generation for stable marketing pages
• ISR for frequently updated content
• Server components for data-heavy pages

Avoid over-optimization

Do not force every page into one rendering mode. Optimize for editing frequency, cacheability, and correctness.

5.3 SEO parity and improvement

At minimum, preserve existing SEO state.

Must-have outputs

• Metadata: title, description, canonical, robots
• Open Graph and Twitter cards
• XML sitemaps
• RSS feeds if content previously offered feeds

Technical checks

• Correct status codes for indexed pages
• Stable canonical tags
• No accidental noindex on production pages
• Structured data for articles and organization

Implementation examples

export async function generateMetadata({ params }: { params: { slug: string } }) {
  const post = await getPostBySlug(params.slug);
  return {
    title: post.seoTitle ?? post.title,
    description: post.seoDescription ?? post.excerpt,
    alternates: { canonical: `/blog/${post.slug}` },
  };
}

export const revalidate = 300;

Pre-launch acceptance tests

• Compare top landing pages against current production metadata
• Crawl staging and verify internal links and canonicals
• Validate sitemap coverage for all intended indexable pages