Code Splitting

Overview

Code splitting is a technique used in web development to optimize the performance of web applications by breaking down the code into smaller, more manageable chunks that are loaded only when needed. This helps reduce the initial bundle size, resulting in faster page load times and improved user experience.

How to use

Here we use code splitting. The installation method is as follows below.

The official Next.js code splitting documentation

Step 1: Use Dynamic Imports for Code Splitting

Next.js introduces the dynamic import function for dynamically loading components and pages, enabling code splitting. Replace your static imports with dynamic imports using the dynamic function from the next/dynamic package. For example:

// Before
import MyComponent from './MyComponent';

// After
import dynamic from 'next/dynamic';

const MyComponent = dynamic(() => import('./MyComponent'));

Step 2: Configure Code Splitting Options

You can configure code splitting options using the ssr and ssg options in the dynamic function. For example:

import dynamic from 'next/dynamic';

const MyComponent = dynamic(() => import('./MyComponent'), {
  ssr: false, // Disable server-side rendering
  ssg: false, // Disable static site generation
});

Step 3: Verify Code Splitting

You can verify that code splitting is working correctly in your Next.js application by checking the network tab in your browser's developer tools. You should see separate chunks being loaded for dynamically imported components or pages.