React Server Components (RSCs) are a feature in Next.js, bridging client-side rendering (CSR) and server-side rendering (SSR). RSCs improve performance, reduce bundle size, and optimize SEO by fetching data, pre-rendering pages, and handling dynamic routes. They offer flexibility, scalability, and ease of use, streamlining modern React app development.
Server-side components are a feature of Next.js, a framework for building server-rendered React applications. They allow you to execute code on the server when a request is made to your app, and use the resulting data to pre-render the HTML for a page. This can be particularly useful for optimizing the performance of your app, as it allows you to do things like fetch data from an API or database on the server, rather than waiting for the client to do it.
React Server Components is similar to Server Side Rendering, with a few key differences:
Overall, RSCs are a new way to implement server-side rendering in React, and they offer a number of benefits over traditional SSR approaches.
In React Server Components convention, components are split into *.server.js and *.client.js to indicate where they are executed. Using *.server.js components can speed up data fetching (as it is close to the data store) and reduce bundle size (some non-view js libraries like moment.js won’t be sent to the client side). And for *.client.jscomponents, actually, they are just like any react components you wrote before but can be seamlessly integrated with *.server.js components which is a huge plus.
The *.server.js components are actually components that render on the server side and the rendered result is serialized and sent to the client side in a JSON format. Which means you cannot use functions (incl. event handler), refs, and most of the hooks in *.server.jscomponents as they are not in the same context as *.client.js components.
This serialized result received in JSON format is streamed down immediately to the client so that the client can do something with that response.
Server-side components are useful for a variety of purposes, including:
Overall, server-side components can be a powerful tool for building fast and efficient applications with Next.js.
React Server Components is a new development that bridges CSR and SSR, which aim to enable developers to be able to make the best out of both of them rather than replacing one with the latter.
Overall, I consider React Server Components as a total step forward from NextJs team.
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