Next.JS 9

Nineth Version of Next.JS

Next.js 9, released in July 2019, introduced several new features and improvements aimed at enhancing the developer experience and scalability of applications. Below are the key details of this version:

Here are the key details and features of Next.js 9:

Key Features of Next.js 9

1. API Routes

Introduced serverless API routes to handle backend logic.
Developers can now create API endpoints by adding JavaScript or TypeScript files in the /pages/api directory.
Example:

export default function handler(req, res) {
res.status(400).json({ message: 'Hello, world!' });
}

Benefits:
Easy integration with existing Next.js projects.
Automatically deployed as serverless functions.

2. Dynamic Routing

Simplified dynamic routes using file-based routing with brackets ([param]).
Example:
File: /pages/post/[id].js
URL: /post/1 or/post/abc.
Access parameters using the useRouter hook orgetServerSideProps.

import { useRouter } from 'next/router';
const Post = () => {
const router = useRouter();
const { id } = router.query;

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

export default Post;

3. Pre-Rendering Improvements

Static Generation (SSG):
Static content is generated at build time.
Use getStaticProps and getStaticPaths for dynamic static content.

Server-Side Rendering (SSR):
Content is generated on each request using getServerSideProps.

4. Automatic Static Optimization

Pages without server-side logic are automatically rendered as static HTML at build time.
Improved performance by reducing server load and enabling fast CDN delivery.

5. Built-In TypeScript Support

Automatic TypeScript configuration and setup.
Next.js detects .ts and .tsx files and generates the necessary tsconfig.json file.
Provides type-checking during development.

6. Improved Developer Experience

Fast Refresh:
Instant feedback while coding with hot reloading.Better Error Reporting:
Improved stack traces and build-time error messages.

7. Middleware Support with Custom Routes

Introduced support for custom routes (next.config.js) for redirects, rewrites, and headers.

module.exports = {
async redirects() {
   return [
   {
    source: '/old-route',
    destination: '/new-route',
     permanent: true,
    },
   ];
},
};

8. Size Reduction

Reduced build sizes for faster deployment.
Code splitting ensures only the necessary JavaScript is loaded for each page.

9. Internationalized Routing

While basic internationalization wasn’t fully supported in v9, developers could implement custom solutions.

10. Enhanced Support for AMP

Added support for the AMP (Accelerated Mobile Pages) AMP framework.
Use the amp property in Next.js pages for AMP compatibility.

11. New Analytics Tools

Improved performance analytics and metrics to monitor website performance in production.

Next.js 9 was a game-changer, setting the foundation for many features available in later versions. It focused on performance, scalability, and ease of use, making it an ideal choice for modern web development.

Next.JS