2025-09-23 |  tech - Binaya

Next.js: A comprehensive beginner guide

Introduction to Next.js: The Beginner’s Guide

If you’ve been working with React, you’ve probably heard about Next.js. It’s a powerful React framework that helps developers build fast, scalable, and SEO-friendly web applications with ease. In this blog, we’ll cover the basics of Next.js, why it’s popular, and how you can get started.

What is Next.js?

Next.js is an open-source React framework built by Vercel. It extends the capabilities of React by adding:

• Server-Side Rendering (SSR)
• Static Site Generation (SSG)
• API Routes
• Built-in Routing System
• Image Optimization

In short, it makes building production-ready apps much easier than using plain React.

Why Use Next.js?

Here are some key benefits of Next.js:

1. SEO-Friendly – Unlike client-side React apps, Next.js pre-renders content, making it easier for search engines to index.
2. Faster Performance – With automatic code splitting and optimized static rendering, your app loads quickly.
3. Built-in Routing – No need for third-party libraries like React Router. Next.js uses a file-based routing system.
4. Full-Stack Capabilities – You can build both frontend and backend (API routes) in the same project.
5. Developer Experience – Hot reloading, TypeScript support, and helpful error messages make development smooth.

Basics of Next.js

Let’s look at the most important building blocks:

1. Project Structure

A typical Next.js project looks like this:

my-app/
├─ pages/
│ ├─ index.js → Homepage
│ ├─ about.js → /about route
│ └─ api/ → API routes
├─ public/ → Static assets (images, fonts, etc.)
├─ styles/ → CSS files
├─ next.config.js → Configuration file
└─ package.json

2. Routing

Next.js uses file-based routing:

• pages/index.js → / (home page)
• pages/about.js → /about
• pages/blog/[id].js → Dynamic routes like /blog/1, /blog/2

This makes routing much simpler compared to React Router.

3. Rendering Methods

Next.js supports multiple rendering strategies:

• Static Site Generation (SSG)
  Pages are generated at build time. Best for blogs, docs, landing pages.
• Server-Side Rendering (SSR)
  Pages are rendered on each request. Best for dashboards, user-specific content.
• Client-Side Rendering (CSR)
  Similar to normal React, rendering happens in the browser.

4. API Routes

You can create backend APIs inside pages/api.

Example: pages/api/hello.js

export default function handler(req, res) {
res.status(200).json({ message: 'Hello from Next.js API!' });
}

This can be accessed at /api/hello.

5. Styling Options

Next.js supports multiple styling approaches:

• CSS Modules (.module.css)
• Styled JSX (built-in support)
• Tailwind CSS (most popular with Next.js projects)
• Sass/SCSS

How to Get Started

You can create a new Next.js app easily using create-next-app:

npx create-next-app@latest my-app
cd my-app
npm run dev

Visit http://localhost:3000 and you’ll see your app running.

Conclusion

Next.js takes React development to the next level by providing performance, SEO, and full-stack features out of the box. Whether you’re building a portfolio site, blog, or a complex web app, Next.js makes it easier, faster, and more scalable.

If you’re comfortable with React, learning Next.js will open up new possibilities in your web development journey.

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