5 Common Pitfalls with Server Components in Next13 (with examples)

Next.js 13’s App Router makes Server Components the default, replacing the Pages Router and introducing architectural differences that can confuse developers accustomed to client-side React. Server Components cannot use hooks or event handlers, so interactive functionality requires a Client Component marked with `"use client"`, while simple data fetching can often be handled directly through asynchronous server-side rendering. Server Components also should not be imported directly into Client Components, because doing so can cause them to behave as client-side code; instead, they can be composed as children passed from a server-rendered parent, with client components using actions such as `router.refresh()` to request updated server-rendered data. Server Components do not automatically re-render when database records or cookies change, requiring routing refreshes or related update mechanisms. Although they can read cookies, only Route Handlers, Server Actions, or middleware can modify them, with middleware requiring special handling when newly assigned values must be accessible during the same request. Finally, data passed from Server Components to Client Components must be JSON-serializable, so classes, functions, and other non-serializable objects should be reconstructed on the client when needed.

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