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Next.js App Router SEO: metadata, canonicals, hreflang – done right

December 31, 2025•6 min read
Author: 7kar7son7 • Developer

How to use Metadata API, canonicals/hreflang and avoid duplicate content across locales.

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TL;DR

  • nextjs app router seo metadata canonical hreflang
  • For Next.js projects with i18n (PL/EN/DE) and SEO goals.

Who this is for

  • For Next.js projects with i18n (PL/EN/DE) and SEO goals.

Keyword (SEO)

  • nextjs app router seo metadata canonical hreflang

Metadata API basics

  • generateMetadata per route
  • Title/description per intent
  • OpenGraph for sharing

Canonicals + alternates

  • One canonical per page
  • Alternates languages
  • Consistent URLs (avoid rewrite/redirect chaos)

Common pitfalls

  • Duplicate paths
  • Wrong noindex
  • Inconsistent sitemap

Want this implemented for your business?

About the author

Developer at DevStudio.it. Focused on performance, SEO and production-ready web apps.

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