Suggest an editImprove this articleRefine the answer for “What is Next.js and what problem does it solve?”. Your changes go to moderation before they’re published.Approval requiredContentWhat you’re changing🇺🇸EN🇺🇦UAPreviewTitle (EN)Short answer (EN)**Next.js** is a React framework that solves the key problems of client-side SPAs and makes building production applications faster and more systematic. **Key point:** Next.js adds a server layer on top of React and closes these pain points.Shown above the full answer for quick recall.Answer (EN)Imageis a React framework that solves the key problems of **client-side SPAs** and makes building production applications faster and more systematic. --- ## What's wrong with plain React (SPA) If you build an application using only React (for example, via Vite/CRA), you quickly run into the following: - **Poor SEO** - the page renders only in the browser - **Long First Paint** - the user sees a blank screen - **No server-side logic out of the box** - **Routing, bundling, optimization - all manual** - **Hard to scale for a real production environment** --- ## What Next.js solves Next.js adds a **server layer** on top of React and closes these pain points. ### 1. Server-side rendering (SSR) HTML is generated **on the server**, not in the browser: - better SEO - faster first paint - suits content and marketing ### 2. Static site generation (SSG) Pages can be: - generated **at build time** - served as plain HTML (very fast) ### 3. Incremental static regeneration (ISR) - the page updates **without a full rebuild** - ideal for catalogs, blogs, marketplaces ### 4. Backend inside the frontend - API routes - server actions - working with a DB, cookies, auth **without a separate backend** ### 5. File-based routing Folder structure = URL structure No extra code or config. ### 6. Optimization out of the box - code splitting - image optimization - streaming - edge / server / client components --- ## In short, one phrase > **Next.js is React + server + SEO + production architecture, out of the box** --- ## When Next.js is the right choice - websites - SaaS - personal dashboards - marketplaces - learning platforms - anything where **speed, SEO, and scalability** matterFor the reviewerNote to the moderator (optional)Visible only to the moderator. Helps review go faster.