Code splitting and lazy loading in Remix - Mini Project: Build & Apply

Code Splitting and Lazy Loading in Remix

📖 Scenario: You are building a Remix web app that shows different sections on demand. To make the app faster, you want to load some parts only when the user needs them.

🎯 Goal: Build a Remix app that uses code splitting and lazy loading to load a Profile component only when the user clicks a button.

📋 What You'll Learn

Create a basic Remix route component with a button

Add a state variable to track if the Profile component should load

Use React.lazy to import the Profile component dynamically

Use Suspense to show a loading message while the Profile loads

💡 Why This Matters

🌍 Real World

Code splitting and lazy loading help web apps load faster by only loading code when needed, improving user experience.

💼 Career

Many modern web apps use lazy loading to optimize performance. Knowing how to implement it in Remix is valuable for frontend developer roles.

1

Set up the basic Remix route with a button

Create a Remix route component in app/routes/index.jsx that renders a button with the text Load Profile. Use a functional component named Index and export it as default.

Remix

export default function Index() {
  // Your code here
}

Hint

Start with a simple function that returns a button element.

2

Add state to track loading the Profile component

Import useState from React. Inside the Index component, create a state variable called showProfile initialized to false. Add an onClick handler to the button that sets showProfile to true.

Remix

import { useState } from 'react';

export default function Index() {
  // Your code here
}

Hint

Use useState(false) and update the state on button click.

3

Use React.lazy to import the Profile component

Import lazy and Suspense from React. Create a lazy-loaded component called Profile using lazy(() => import('./Profile')). Inside the Index component, below the button, conditionally render Profile inside a Suspense with fallback text Loading profile... only if showProfile is true.

Remix

import { useState, lazy, Suspense } from 'react';

const Profile = lazy(() => import('./Profile'));

export default function Index() {
  const [showProfile, setShowProfile] = useState(false);

  return (
    
       setShowProfile(true)}>Load Profile
      {/* Your code here */}
    
  )
}

Hint

Use lazy to import the component and wrap it in Suspense with a fallback.

4

Create the Profile component file

Create a new file app/routes/Profile.jsx. Export a default functional component named Profile that returns a div with the text User Profile Loaded.

Remix

export default function Profile() {
  // Your code here
}

Hint

This component will be loaded only when requested.