What is Server-Side Rendering?
Server-Side Rendering (SSR) is a technique where web pages are generated on the server for each request, sending fully rendered HTML to the browser. SSR improves initial page load performance and SEO by delivering complete content immediately rather than requiring client-side JavaScript to render the page.
How Does Server-Side Rendering (SSR) Work?
With SSR, when a user requests a page, the server executes the application code, fetches necessary data, renders the complete HTML, and sends it to the browser. The browser can display the content immediately without waiting for JavaScript to download and execute. The client-side JavaScript then hydrates the page, attaching event listeners and making it interactive. This results in faster First Contentful Paint and better performance on low-powered devices.
SSR is particularly beneficial for content-heavy and SEO-dependent websites because search engine crawlers receive fully rendered HTML without needing to execute JavaScript. Frameworks like Next.js, Nuxt.js, and SvelteKit make SSR straightforward with built-in data fetching and rendering pipelines. The trade-off is increased server load and complexity compared to static sites or client-side rendered applications. SSR requires a Node.js server or serverless functions to render pages on demand, which impacts hosting requirements and costs compared to static hosting.