Hire a Next.js Developer — App Router, RSC & Production SSR

Next.js is a React-based web framework developed by Vercel that adds server-side rendering, static site generation, file-based routing, and full-stack capabilities to React. Where React is a UI library that runs in the browser, Next.js handles the server layer: it can render pages on the server before sending them to the browser (better performance and SEO), generate pages at build time as static HTML (fastest possible delivery), or render them on demand per request. Next.js is the most widely adopted React framework and is used in production by companies including Vercel, Notion, Twitch, and The Washington Post.

React is a JavaScript library for building user interfaces. It handles component rendering, state, and interactivity in the browser. Next.js is a framework built on top of React that adds everything React deliberately omits: routing, server-side rendering, static generation, API routes, image optimisation, font loading, and deployment infrastructure. You cannot use Next.js without React — React is the underlying UI layer. You can use React without Next.js — but you would then need to choose and configure routing, bundling, server rendering, and deployment yourself. For most production web applications, Next.js is the pragmatic choice because it solves those problems well and with minimal configuration.

React Server Components (RSC) are a category of React components that render exclusively on the server and send HTML to the browser — they never ship their JavaScript to the client. This means a page built with Server Components can fetch data, render complex content, and deliver it to the browser without adding any JavaScript to the client bundle. For content-heavy pages — product listings, blog posts, dashboards populated from a database — RSC can reduce client-side JavaScript to near zero, dramatically improving First Load JS and Interaction to Next Paint scores. Next.js App Router uses Server Components by default; components only become Client Components when they explicitly opt in using the 'use client' directive.

Vite is a frontend build tool and development server, not a framework. It does not handle routing, server-side rendering, or deployment. It makes local development fast by using native ESM and skipping bundling during development. Next.js is a complete web framework that handles routing, rendering, data fetching, optimisation, and deployment. These are not competing alternatives for the same use case. Use Vite when you are building a client-side React SPA and want a fast development experience with full control over your own architecture. Use Next.js when you need server-side rendering, static generation, file-based routing, and the performance optimisations (image, font, script) that Next.js provides out of the box.

The App Router is the routing system introduced in Next.js 13 and made stable in Next.js 14, replacing the previous Pages Router. It uses a folder-based structure inside an 'app' directory where each folder defines a route segment. It introduces nested layouts that persist across navigation, React Server Components as the default rendering model, Suspense for streaming, loading and error states as first-class file conventions, and Server Actions for handling form submissions and data mutations without writing separate API endpoints. The App Router is a significant architectural shift from the Pages Router — not just a naming change — and requires hands-on experience to apply correctly in production.