A Beginner's Guide to Next.js
Tags: nextjs, javascript, dynamicweb, framework
Published: 2023-10-08 07:06:38

Next.js is a React framework that simplifies the process of building web applications. It offers features like Server-Side Rendering (SSR), Static Site Generation (SSG), Incremental Static Regeneration (ISR), and Client-Side Rendering (CSR) for seamless user experiences.


![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/ud2ma8skj1cmb4zsmhs4.jpg)

## Section 1: Understanding Next.js Fundamentals

#### What is Next.js?

Next.js is a React framework that simplifies the process of building web applications. It offers features like Server-Side Rendering (SSR), Static Site Generation (SSG), Incremental Static Regeneration (ISR), and Client-Side Rendering (CSR) for seamless user experiences.

#### Core Features of Next.js
-  Server-Side Rendering (SSR): Rendering pages directly on the server for improved performance and search engine optimization.
-     Static Site Generation (SSG): Generating static HTML pages during the build process, ensuring lightning-fast loading times.
-     Incremental Static Regeneration (ISR): Combining static and dynamic rendering to keep content fresh without sacrificing speed.
-     Client-Side Rendering (CSR): Loading content dynamically on the client side for interactive user experiences.

## Section 2: Navigating Next.js Routes

#### Basics of Next.js Routing

Creating pages inside the pages directory automatically establishes routes. For example, pages/about.js creates a route for /about.

#### Dynamic Routes

Utilize square brackets ([]) to create dynamic routes. For instance, pages/[id].js enables dynamic routes like /1, /2, etc.
JavaScript


```
import { useRouter } from 'next/router';

const Post = () => {
const router = useRouter();
const { id } = router.query;

return <h1>Post ID: {id}</h1>;
};

export default Post;
```

#### Nested Routes - Hierarchical Structures

Create nested routes using folders within the pages directory. For example, pages/blog/[slug].js creates routes like /blog/post-slug.
JavaScript

```
import { useRouter } from 'next/router';

const BlogPost = () => {
const router = useRouter();
const { slug } = router.query;

return <h1>Blog Post: {slug}</h1>;
};

export default BlogPost;
```

## Section 3: Practical Implementation - From Setup to Deployment

**Create a new Next.js project -**

```
 npx create-next-app@latest
```
**Follow these installation prompts -** 

```
What is your project named? my-app
Would you like to use TypeScript? No / Yes
Would you like to use ESLint? No / Yes
Would you like to use Tailwind CSS? No / Yes
Would you like to use `src/` directory? No / Yes
Would you like to use App Router? (recommended) No / Yes
Would you like to customize the default import alias (@/*)? No / Yes
What import alias would you like configured? @/*
```

**Start the development server -**

```
 npm run dev
```


#### Dynamic Routing in Action - Building a Blog System

_Extend the dynamic routing example to create a functional blog system with Next.js:_

    

- Create a pages/blog folder.
-     Inside the pages/blog folder, create a [slug].js file.
-     In the pages/blog/[slug].js file, import the useRouter hook from next/router.
-     Use the useRouter hook to get the slug parameter from the URL.
-     Fetch the blog post data from an API or database using the slug parameter.
-     Render the blog post data on the page.

Congratulations! You've taken your first steps into the exciting world of Next.js. With a solid understanding of its fundamental concepts and practical implementation, you are well on your way to creating dynamic, interactive web applications. Remember, practice makes perfect. Continue experimenting, exploring, and building to further enhance your skills. Happy coding!