Next.js App Router represents a paradigm shift in React application structure, switching default rendering from Client-Side to Server Components. Migrating a legacy Pages Router app requires a careful, incremental strategy.
Incremental Migration Strategy
Next.js allows the Pages Router and App Router to coexist in the same project. We suggest migrating pages one-by-one, beginning with marketing and static pages (like About and Contact) before tackling complex dashboard layouts.
Decoupling Client vs. Server Components
RSCs (React Server Components) fetch data and render on the server, sending static HTML to the browser. Only wrap components with 'use client' when they use state hooks, context providers, or native event listeners.
Transitioning Router Hooks
Next.js App Router replaces `next/router` hooks with `next/navigation`. Update calls to `useRouter` to import from `next/navigation`, and note that `router.query` is replaced with `useParams` and `useSearchParams`.
Key Takeaways
- Next.js App and Pages routers can run simultaneously to minimize risk
- React Server Components reduce client-side JS bundle sizes and improve LCP
- Decouple stateful widgets from static layouts for maximum efficiency
- Replace legacy router imports with navigation module hooks
Written by SVASTSYS TECHNOLOGY Team
Insights and best practices from our engineering and design teams, based on real project experience.
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