How Next.js SSR Works: A 3-Layer Architecture

How Next.js SSR Really Works Under the Hood Next.js uses a 3-layer architecture where React Server DOM serializes components into binary RSC payloads via ReactDOMServer.renderToReadableStream. The bundler (Webpack/Turbopack) automatically code-splits client bundles while the server streams serialized component trees. React Client DOM then hydrates these streams - essentially "reviving" server-rendered components by attaching event handlers and making them interactive. This entire process is powered by file-system-based routing where every page.tsx automatically maps to a URL route. The magic happens through seamless coordination between server-component execution, client-side hydration, and intelligent code splitting - delivering both blazing-fast initial loads and full SPA interactivity. #NextJS #React #SSR #WebDevelopment #JavaScript #Programming #Frontend

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