A deep dive into the architectural decisions behind migrating to App Router, the tradeoffs involved, and lessons learned.
When Next.js 13 introduced the App Router, I faced a decision: stick with the battle-tested Pages Router or embrace the new paradigm. Here's my analysis.
Pages Router gives you simplicity and predictability. App Router gives you React Server Components, nested layouts, and streaming. The question isn't which is "better"—it's which tradeoffs align with your project.
1. Server Components by default - no more getServerSideProps boilerplate
2. Nested layouts that persist across navigation
3. Streaming with Suspense for better perceived performance
4. Colocation of data fetching with components
1. Steeper learning curve for the team
2. Some third-party libraries needed updates
3. Mental model shift from "pages" to "segments"
I use a simple heuristic: if your app has complex nested layouts or needs fine-grained loading states, App Router wins. For simple CRUD apps, Pages Router is still excellent.