Web & Mobile
SSR is a web rendering technique in which HTML pages are generated on the server for each request and sent fully formed to the browser, enabling fast initial page loads and search engine-friendly content.
In contrast to client-side rendering where JavaScript builds the DOM in the browser after the page loads, SSR returns complete HTML from the server so the browser can display meaningful content immediately — even before JavaScript has parsed and executed. This leads to better First Contentful Paint (FCP) and Largest Contentful Paint (LCP) metrics, which are Core Web Vitals that directly influence Google search rankings. SSR is particularly valuable for content-heavy pages (news, e-commerce product listings, marketing pages) where SEO and perceived load speed are critical. Frameworks like Next.js, Nuxt.js, and SvelteKit support SSR with the flexibility to mix server-rendered and statically generated pages within the same application, choosing the optimal strategy per route.
Example
A Next.js e-commerce product page uses SSR to render price, availability, and product description on the server for every request, ensuring that Google's crawler sees fully populated content and that users see the page without a loading spinner.
Related terms
SSG (Static Site Generation)
SSG is a web rendering technique in which HTML pages are pre-generated at build time rather than on each request, resulting in static files that are served from a CDN for maximum performance and minimal server infrastructure.
Frontend
Frontend refers to the client-side layer of a web or mobile application — everything the user sees and interacts with directly, including layout, visual design, navigation, and interactive behaviour rendered in the browser or on the device.
CDN (Content Delivery Network)
A CDN is a globally distributed network of servers that caches and delivers web content — images, CSS, JavaScript, and HTML — from locations geographically close to each user, reducing latency and improving load times.
Headless CMS
A headless CMS is a content management system that decouples the content repository (back end) from the presentation layer (front end), delivering content as structured data via APIs to any channel or device.
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