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Parth Raval
Parth Raval

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Angular 20 Interview Questions and Answers (2025) – Part 4: Standalone Components, Angular Elements & Micro Frontends

#angular #mfe #interview #frontend

angular-20-interview-questions-and-answers-2025–Part4Standalone-Components,Angular-Elements&Micro-Frontends

In Part 3, we explored Forms, Validation, and Routing (Q101–Q150).

Now in Part 4 of Angular 20 Interview Questions and Answers (2025 Edition), we’ll cover:

  • Standalone Components (Q151–Q158)
  • Angular Elements (Q159–Q163)
  • Micro Frontends (MFE) with Module Federation (Q164–Q170)

Standalone Components (Q151–Q158)

Q151. What are standalone components in Angular?

  • Introduced in Angular 14.
  • Allow components to exist without NgModules.
  • Simplifies application structure and bootstrapping.

Q152. How do you create a standalone component in Angular 20?

ng g component home --standalone
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This generates a component with standalone: true.

Q153. How do you declare a standalone component?

@Component({
  selector: 'app-home',
  standalone: true,
  templateUrl: './home.component.html',
  imports: [CommonModule]
})
export class HomeComponent {}
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Q154. How do you bootstrap an Angular app with standalone components?

bootstrapApplication(AppComponent, {
  providers: [provideRouter(routes)]
});
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Q155. What are the benefits of standalone components?

  • No need for NgModule boilerplate.
  • Faster bootstrapping.
  • More modular, easier migration.
  • Works well with micro frontends.

Q156. Can standalone components use other components or directives?

  • Yes, by importing them in the imports array.

Q157. How do you use dependency injection with standalone components?

  • Works the same as traditional components using providers.

Q158. How do standalone components improve tree-shaking?

  • Since they declare their own imports, unused code is more easily excluded by the bundler.

Angular Elements (Q159–Q163)

Q159. What are Angular Elements?

  • Angular components packaged as custom elements (Web Components).
  • Can be used in any framework (React, Vue, plain JS).

Q160. How do you create an Angular Element?

  • Use createCustomElement() from @angular/elements.
  • Register with customElements.define().

Q161. Example of converting a component to Angular Element?

import { createCustomElement } from '@angular/elements';
import { Injector } from '@angular/core';

constructor(private injector: Injector) {
  const el = createCustomElement(HelloComponent, { injector });
  customElements.define('hello-element', el);
}
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Q162. What are the use cases of Angular Elements?

  • Embedding Angular widgets in non-Angular apps.
  • Gradual migration from legacy apps.
  • Reusable UI components across projects.

Q163. What are the limitations of Angular Elements?

  • Larger bundle size than native web components.
  • Performance overhead due to Angular runtime.

Micro Frontends (Q164–Q170)

Q164. What are Micro Frontends (MFE) in Angular?

  • Architectural style where a frontend app is split into independently deployable modules.
  • Each module can be built with Angular or other frameworks.

Q165. How do you implement Micro Frontends in Angular 20?

  • Use Webpack Module Federation with Angular CLI or Nx.
  • Define one app as host and others as remotes.

Q166. Example of configuring Module Federation in Angular?
webpack.config.js:

plugins: [
  new ModuleFederationPlugin({
    name: 'remoteApp',
    filename: 'remoteEntry.js',
    exposes: { './Module': './src/app/remote/remote.module.ts' }
  })
]
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Q167. What are the benefits of Micro Frontends in Angular?

  • Independent deployments.
  • Technology agnostic.
  • Scales well for large teams.
  • Easier upgrades of individual modules.

Q168. What are the challenges of Micro Frontends?

  • Increased complexity in routing and communication.
  • Shared state management issues.
  • Higher initial setup complexity.

Q169. How do Angular Standalone Components help in MFE architecture?

  • Removes module dependency → smaller, self-contained units.
  • Makes remote apps lighter and easier to integrate.

Q170. How do you share libraries across MFEs in Angular?

  • Use Module Federation shared config.
  • Example: sharing @angular/core, rxjs to avoid duplication.

Conclusion

This was Part 4 of Angular 20 Interview Questions and Answers (2025 Edition).

We covered:
Standalone Components (Q151–Q158)
Angular Elements (Q159–Q163)
Micro Frontends (Q164–Q170)

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