How to create standalone components in Angular 19 for modular architecture

Angular 19 introduces Standalone Components, a powerful way to build modular applications without the need for NgModules. This approach simplifies development, reduces boilerplate, and improves performance. In this guide, we'll walk through creating and using standalone components effectively.

Step 1: Create an Angular 19 Project

1. Set up a new Angular project:

ng new angular-standalone-app --standalone
cd angular-standalone-app

Ensure Angular 19 is installed:

ng version

Step 2: Understanding Standalone Components

Standalone components are self-contained and can be used without being part of an NgModule.

Example of creating a standalone component:

ng generate component components/Header --standalone

Step 3: Creating and Using Standalone Components

1. Create a Standalone Header Component

import { Component } from '@angular/core';

@Component({
  selector: 'app-header',
  standalone: true,
  template: `<h1>Welcome to Angular 19</h1>`,
})
export class HeaderComponent {}

Use Standalone Component in the App

• Import it directly in main.ts:

import { bootstrapApplication } from '@angular/platform-browser';
import { AppComponent } from './app/app.component';

bootstrapApplication(AppComponent);

Use the component inside app.component.ts:

import { Component } from '@angular/core';
import { HeaderComponent } from './components/header.component';

@Component({
  selector: 'app-root',
  standalone: true,
  imports: [HeaderComponent],
  template: `<app-header></app-header><p>Main content goes here...</p>`,
})
export class AppComponent {}

Step 4: Managing Dependencies in Standalone Components

1. Import External Modules as Needed

import { CommonModule } from '@angular/common';

@Component({
  selector: 'app-dashboard',
  standalone: true,
  imports: [CommonModule],
  template: `<p>Dashboard works!</p>`,
})
export class DashboardComponent {}

Use Routing with Standalone Components

• Define routes using provideRouter():

import { provideRouter, Routes } from '@angular/router';

const routes: Routes = [
  { path: '', component: DashboardComponent },
];

bootstrapApplication(AppComponent, { providers: [provideRouter(routes)] });

Step 5: Benefits of Standalone Components in Modular Architecture

1. No need for NgModules, reducing complexity.
2. Faster bootstrapping due to direct component imports.
3. Better modularity, making components easily reusable.
4. Improved lazy loading with smaller application bundles.

Conclusion

Standalone components in Angular 19 make applications more modular, scalable, and maintainable. By removing NgModules, developers can simplify application architecture, improve performance, and make components easier to manage. 🚀

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