Migrating from Next.js Pages Router to App Router is a significant but manageable project. The recommended approach is incremental - both routers can run in parallel in the same Next.js project, so you migrate route by route rather than all at once.
Next.js App Router was introduced in Next.js 13.4 and became stable and recommended in Next.js 14. By 2026, nearly all new Next.js projects use App Router. If you're on Pages Router, here's everything you need to know about migrating.
Key differences
Concept
Pages Router
