- A feature of React that lets developers write components whose code runs exclusively on the server and whose rendered output (HTML/JSON) is streamed to the client. Server components can import server‑only modules (e.g., database drivers, file‑system APIs) without increasing the client bundle size, because they are never sent to the browser. RSCs are composed together with normal client components: The framework automatically hydrates only the client‑side parts while the server‑side parts are rendered to static markup on the server. React Server Components were introduced experimentally in 2022 in React 18.
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