While Single Page Applications (SPAs) built with React are highly interactive, they have one major drawback: SEO. Search engine crawlers struggle to index content dynamically rendered via client-side JavaScript.
Next.js solves this problem by offering server-side rendering (SSR), static site generation (SSG), and incremental static regeneration (ISR) out-of-the-box.
Server-Side Rendering (SSR) vs. Static Site Generation (SSG)
Next.js allows you to choose rendering strategies per page:
- SSG (Static Site Generation): Pre-renders HTML pages at build time. Ideal for blog pages, documentation, and home pages that rarely change. SSG loads instantly, boosting performance and Core Web Vitals score.
- SSR (Server-Side Rendering): Renders pages on the server for each unique request. Perfect for real-time dashboards, user profiles, or pages with dynamic, user-specific data.
Built-In Optimization Features
Next.js also optimizes media automatically, including the next/image component for responsive images, metadata helper APIs for custom title and description tags, and font optimization utilities to avoid layout shifts.
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