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Technical SEO Checklist for Next.js Websites (App Router Guide)

The definitive technical SEO audit checklist for Next.js App Router websites: metadata API, dynamic sitemaps, canonicals, Core Web Vitals, and SSR/SSG.

H

Harsh Srivastava

Head of SEO & Growth

Published: 2026-10-27
Last Updated: 2026-10-27

📋 Editorial Status: Approved Structural Outline

This guide is currently in production by our senior technical team. The outline and key takeaways below represent our verified methodology.

Table of Contents

  1. •1. Next.js 15+ Metadata API & Dynamic OG Images
  2. •2. Absolute Canonical URLs & Trailing Slash Control
  3. •3. sitemap.ts & robots.ts Native Generation
  4. •4. Sub-Second LCP, CLS, and INP Optimization
  5. •5. Semantic JSON-LD Injection without Render-Blocking

01.Metadata Architecture

Using generateMetadata with TypeScript strict types, openGraph tags, and fallback hierarchies.

Key Execution Takeaway: Verified standard deployed across all NexSolx client audits.

02.Canonical Control

Enforcing lowercase absolute canonicals and configuring trailingSlash: false in next.config.ts.

Key Execution Takeaway: Verified standard deployed across all NexSolx client audits.

03.Automated Routing Files

Generating real-time sitemaps from database records and handling robots.txt policies programmatically.

Key Execution Takeaway: Verified standard deployed across all NexSolx client audits.

04.Passing Core Web Vitals

Optimizing next/font, next/image priority loading, and removing client-side hydration bottlenecks.

Key Execution Takeaway: Verified standard deployed across all NexSolx client audits.

05.Structured Data Implementation

Injecting Schema.org JSON-LD scripts in RootLayout without breaking server-side streaming.

Key Execution Takeaway: Verified standard deployed across all NexSolx client audits.
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Written & Verified By

Harsh Srivastava

Head of SEO & Growth at NexSolx Technologies

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