nextjs-app-router-expert

Enforcing Next.js app router boundaries involves separating server and client components to optimize bundles, using shared services in lib/services for data access, and awaiting params and cookies in server components.

The shared services pattern in Next.js app router centralizes data access and API integration into lib/services or features/*/service.ts files, ensuring scalable and maintainable server component data-fetching workflows.

Auditing a Next.js 15/16 project requires reviewing pages, components, API routes, and data-fetching flows to ensure adherence to app router conventions like proper route handler practices and shared service usage.

Yes, Next.js app router enforcement applies to existing API routes and data fetching workflows by guiding refactors to align with consistent route handler practices and shared service patterns.

The best way to refactor Next.js pages and components is to enforce correct server/client separation, use shared services for data access, and ensure params and cookies are properly awaited.

Next.js app router architectures often lack maintainability when server/client component boundaries are blurred and shared service patterns are not consistently applied across data fetching workflows.