Implementing Standalone Components in Angular 15

Table of content

Bootstrap
App Component, but standalone
Lazy loading routes
Conclusion

In this article, I'm going to show you the most important parts to create an angular app using only standalone components. Yes, no ngmodule is needed.

You have all the code available in this repo, which tries to represent a real-world app. If you are learning Angular, give it a try, and give me your thoughts!

DEMO HERE: https://angular-example-app.netlify.app/

Bootstrap

The most important change is inside the src/main.ts file. First of all, we need to bootstrap the application in a different way:

Before:

platformBrowserDynamic().bootstrapModule(AppModule);

After:

import { importProvidersFrom } from '@angular/core';
import { bootstrapApplication } from '@angular/platform-browser';
import { provideRouter } from '@angular/router';
...

bootstrapApplication(AppComponent, {
  providers: [
    importProvidersFrom(HttpClientModule),
    provideRouter([
      {
        path: '',
        component: HomePageComponent,
        pathMatch: 'full',
      },
      { path: '404', component: Error404PageComponent },
      { path: '**', redirectTo: '404' },
    ]),
    ...
  ],
});

Now, we are using provideRouter and importProvidersFrom. These methods allow us to provide routes and extract providers from some modules without importing them.

App Component, but standalone

Following the bootstrap configuration, we need to create components and enable the standalone flag. The app.component.ts looks like this:

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.scss'],
  imports: [RouterOutlet, NgIf, ...],
  standalone: true,
})
export class AppComponent implements OnInit {}

Notice how can we import other standalone components directly, and even other ngmodules, like for example ReactiveFormsModule. Other than that, everything inside the component works as before.
Here another example of component using other standalone components and modules:

@Component({
  selector: 'app-edit-profile',
  templateUrl: './edit-profile.component.html',
  standalone: true,
  imports: [ReactiveFormsModule, TrimDirective, FormErrorsComponent, LowercaseDirective, NgIf],
})
export class EditProfileComponent implements OnInit {}

Lazy loading routes

Lastly, I'm going to show you how to lazy loading routes. You have to do it while defining the bootstrap:

{
  path: 'auth',
    loadChildren: () => import('./app/modules/auth/auth.routes').then(mod => mod.AUTH_ROUTES),
}

Here I'm using a constant called AUTH_ROUTES to hold my auth routes:

export const authPaths = {
  base: 'auth',
  logIn: 'log-in',
  register: 'register',
  logout: 'logout',
};

export const authRoutes = {
  logIn: `/${authPaths.base}/${authPaths.logIn}`,
  register: `/${authPaths.base}/${authPaths.register}`,
  logout: `/${authPaths.base}/${authPaths.logout}`,
};

export const AUTH_ROUTES: Route[] = [
  { path: authPaths.logIn, component: LogInPageComponent, canActivate: [NoAuthGuard] },
  { path: authPaths.register, component: RegisterPageComponent, canActivate: [NoAuthGuard] },
  {
    path: authPaths.logout,
    component: LogoutPageComponent,
  },
  { path: '**', redirectTo: appPaths.error404 },
];

By doing this, I can refactor route names easily.

Conclusion

Remember, you have a complete real world app in this repo.

DEMO HERE: https://angular-example-app.netlify.app/

I hope you have learned something new. If you think this might help other people, please hit the like button so that others can read it. ❤️

If you have any thoughts or questions, feel free to leave a comment!

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Implementing Standalone Components in Angular 15

Ismael Ramos 🚀

Bootstrap

App Component, but standalone

Lazy loading routes

Conclusion

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