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Server Side Rendering with JavaScript Frameworks

What is server side rendering?

Server-side rendering is the process that generates and rewrites HTML server-side, and usually stores it in a cache to be sent to the browser when a page is requested.

While this process may be triggered by a server programmed job or task, server side rendered pages my be generated on the fly, that means, only when a page is requested.

server side rendering server side rendering

Hydration

But how do we make the page dynamic to respond to user interaction while keeping state consistent?

State may be transferred from the server-side to the client-side, during a JavaScript bootstrapping or initialization of the application process, known as hydration. This process comes with considerable performance overhead.