Why Lazy loading modules with routes in Angular? - Purpose & Use Cases

The Big Idea

Discover how to make your Angular app lightning fast by loading only what your users need, exactly when they need it!

The Scenario

Imagine building a large Angular app where every feature loads all at once when the user opens the site.

This means the user waits a long time before anything shows up, even if they only want to use one small part.

The Problem

Loading all code at once makes the app slow to start and wastes data, especially on slow connections.

It also makes updates harder because every change requires loading the entire app again.

The Solution

Lazy loading modules with routes means Angular only loads the code for a feature when the user visits that part of the app.

This speeds up the initial load and saves data by loading only what is needed, exactly when it is needed.

Before vs After

✗ Before

import { FeatureModule } from './feature/feature.module';
@NgModule({ imports: [FeatureModule] })

✓ After

const routes = [{ path: 'feature', loadChildren: () => import('./feature/feature.module').then(m => m.FeatureModule) }];

What It Enables

This lets your app start fast and grow big without slowing down users, by loading features only when they want them.

Real Life Example

Think of a shopping app that loads the homepage quickly, then only loads the payment feature when you go to checkout.

Key Takeaways

Loading all features at once slows down your app.

Lazy loading loads code only when needed, improving speed.

Angular routes make lazy loading easy and automatic.