How React Server Components Require a New Mental Model for Vite Developers

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Developers migrating from Vite-based React apps to Next.js App Router face a fundamental shift in how components are rendered and executed. In Vite, all components run in the browser by default, relying on hooks like useState and useEffect for data fetching and interactivity. Next.js App Router reverses this default — every component is a Server Component unless explicitly marked with the 'use client' directive. Server Components run exclusively on the server, enabling direct database access and eliminating unnecessary JavaScript from the client bundle. A common migration mistake is overusing 'use client' to suppress errors, which effectively negates the performance benefits that Server Components offer.

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