Angular - Single Page Application

By Author: jatin
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Learn how to build an Angular single page application (SPA) with routing, REST API integration, lazy loading, testing, and performance optimization tips.
Introduction
In the modern web development landscape, users expect fast, seamless, and dynamic web experiences. Traditional multi-page applications (MPAs) often fall short in terms of speed and user interaction. This is where Angular single page applications (SPAs) shine.
If you've ever used Gmail or Facebook, you've interacted with an SPA - a web app that loads a single HTML page and dynamically updates content without refreshing the page. This blog will teach you everything you need to know to build your own single page application website using Angular.
We'll dive deep into Angular's architecture, lazy loading modules, REST API integration, and explore the best practices for Angular module structure, unit testing, and performance optimization in Angular. By the end, you'll have a clear roadmap to build production-ready SPAs.
What is an Angular Single Page Application (SPA)?
A Single Page Application (SPA) is a web application or site ...
... that interacts with the user by dynamically rewriting the current page rather than loading entire new pages from the server.
When you build an Angular one page application, Angular handles routing on the client side using the Angular Router module.
Why Use SPA in Angular?
Fast and responsive user experience
Less server load and bandwidth usage
Clean separation between front-end and back-end
Smooth navigation without full-page reloads
Core Features of Angular for SPA Development
Let's break down the core features that make Angular a great choice for SPAs:
1. Angular Router
Angular's routing system enables navigation within your app without page reloads.
const routes: Routes = [ { path: '', component: HomeComponent }, { path: 'about', component: AboutComponent }, ];
Use the tag in your main template to load route components dynamically.
2. Two-Way Data Binding
This allows your UI and model to stay in sync in real time.
3. Dependency Injection
Simplifies service management across components.
4. Angular CLI
Speeds up development with powerful tools for scaffolding and testing.
Angular Single Page Application Tutorial: Step-by-Step
Let's build a basic Angular single page app.
Step 1: Create Angular App
ng new angular-spa-demo cd angular-spa-demo ng serve
Step 2: Set Up Routing
When prompted, choose Yes for routing during setup.
Create components:
ng generate component home ng generate component about
Update app-routing.module.ts:
const routes: Routes = [ { path: '', component: HomeComponent }, { path: 'about', component: AboutComponent } ];
Add router outlet in app.component.html:

Angular Lazy Loading Modules
Lazy loading helps optimize performance by loading modules only when needed.
ng generate module admin - route admin - module app.module
This command sets up a separate route and lazy loads the AdminModule.
Lazy loading is a key feature of any performance optimization in Angular app structure.
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