How to implement server-side rendering (SSR) in Next.js



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Server-side rendering (SSR) in Next.js is a powerful feature that allows you to generate HTML on the server side rather than on the client side. This can improve the performance and SEO of your application. Here's a step-by-step guide on how to implement SSR in Next.js:

1. Create a Next.js App

First, you need to create a new Next.js app. You can do this using the following commands:

bash
npx create-next-app my-nextjs-app

cd my-nextjs-app

2. Create a Server-Side Rendered Page

Create a new file under the pages directory for the page that you want to be server-side rendered. For example, create a file named ssr-page.js:

jsx
// pages/ssr-page.js
import React from 'react';

const SSRPage = ({ data }) => {
  return (
    <div>
      <h1>Server-Side Rendered Page</h1>
      <p>Data from server: {data}</p>
    </div>
  );
};

export async function getServerSideProps() {
  // Fetch data from an API or database
  const res = await fetch('https://api.example.com/data');
  const data = await res.json();

  // Pass data to the page via props
  return {
    props: {
      data,
    },
  };
}

export default SSRPage;

In this example, the getServerSideProps function is used to fetch data from an API or database and pass it as props to the component. This function runs on the server every time a request is made to the page.

3. Run Your Next.js App

Start your Next.js app to see the server-side rendering in action:

bash
npm run dev

Visit http://localhost:3000/ssr-page in your browser to see the server-side rendered page.

4. Test Server-Side Rendering

You can test server-side rendering by disabling JavaScript in your browser. With JavaScript disabled, the page should still render on the server side.

Note:

  • Next.js automatically identifies files in the pages directory and creates routes for them. The file name determines the route. For example, ssr-page.js becomes /ssr-page.
  • The getServerSideProps function is used for server-side rendering. It's an asynchronous function that runs on the server and fetches data before rendering the page.

That's it! You've successfully implemented server-side rendering in a Next.js app. Keep in mind that not all pages need to be server-side rendered; you can choose the appropriate rendering strategy based on your application's requirements.

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