What is Next.js?

Next.js is a full-stack React framework that helps developers build fast, SEO-friendly, and production-ready web applications. It provides built-in features like routing, server-side rendering, static site generation, API routes, and performance optimization.

Who Invented Next.js?

Next.js was created by Vercel (previously called Zeit) in 2016. It was developed to solve performance and SEO problems found in traditional React single-page applications.

Why We Use Next.js?

• Improves SEO with server-side rendering
• Faster initial page load
• Built-in file-based routing
• Backend and frontend in one project
• Automatic code splitting
• Image optimization
• Streaming and caching support

When Should We Use Next.js?

• When SEO is important (blog, news, e-commerce)
• When fast performance is required
• When building scalable production apps
• When both frontend and backend are needed together
• When server-side rendering is required

Merits (Advantages)

• SEO friendly
• Server-side rendering (SSR)
• Static site generation (SSG)
• File-based routing
• Built-in API routes
• Image optimization
• Automatic performance optimization
• Middleware support
• Streaming support

Demerits (Disadvantages)

• More complex than plain React
• Learning curve for beginners
• Build time may increase in large projects
• Overkill for small simple apps
• Requires proper understanding of server vs client components

Real-World Example

An e-commerce website uses Next.js to load product pages quickly, improve SEO rankings, and handle dynamic data like pricing, reviews, and cart updates efficiently.

Interview Tip

Next.js is a React framework created by Vercel that provides server-side rendering, static site generation, and built-in routing to build fast, SEO-friendly web applications.