next-best-practices

To fix React Server Component boundaries, enforce valid 'use client', 'use server', and 'use cache' directives to prevent invalid async behavior in client code and resolve hydration errors.

Handle async params and searchParams in Next.js 15+ by processing them as Promise-based APIs within your server components. This approach satisfies async API requirements and prevents data fetching regressions during route rendering.

The correct Next.js App Router file structure standardizes your app/ directory using layout.tsx, page.tsx, loading.tsx, error.tsx, and not-found.tsx files. Establishing this consistent route file convention prevents routing bugs and structural drift.

Use Server Components for data fetching and rendering, Server Actions for mutations, and Route Handlers for API endpoints. Choosing the correct directive pattern prevents broken data fetching and ensures valid non-serializable prop constraints.

Next.js App Router projects experience hydration errors and routing bugs due to inconsistent file layouts, incorrect React Server Component boundaries, and broken patterns for async APIs. Standardizing route conventions and directive usage resolves these issues.