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Four Common Breakages Developers Face When Migrating to Next.js App Router

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Migrating client projects from Next.js Pages Router to the App Router introduces several recurring technical breakages that can cost developers significant time. The App Router eliminates getServerSideProps in favor of direct server-component fetching, but fetch results are cached by default, which can cause stale data issues if not explicitly overridden. All components are server components by default, meaning the 'use client' directive must be carefully scoped to leaf components to avoid losing server-side performance gains. Navigation APIs have also changed, with useRouter now imported from next/navigation and route parameters accessed via useParams(), while params itself must be awaited in recent Next.js versions. Authentication helpers that relied on request and response objects require reworking, with session checks and redirects now handled inside server components using the redirect utility from next/navigation.

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