Angular Interview Questions and Answers Examples

A curated list of common Angular interview questions with concise answers and examples.

Table of Contents

• Chapter 1: The Basic Concepts of Angular
• Chapter 2: Concepts of Components
• Chapter 3: Concepts of Templates
• Chapter 4: Concepts of Directives
• Chapter 5: Concepts of Signals
• Chapter 6: Concepts of Dependency Injection (DI)
• Chapter 7: Concepts of Routing
• Chapter 8: Concepts of Forms
• Chapter 9: Concepts of HTTP Client
• Chapter 10: Concepts of SSR & Hybrid Rendering
• Chapter 11: Concepts of Pipes
• Chapter 12: Concepts of NgModules
• Chapter 13: Concepts of Internationalization (i18n)
• Chapter 14: Angular Security
• Chapter 15: Concepts of RxJS with Angular
• Chapter 16: AI Experimental Features
• Chapter 17: Compiler & Build Tools
• Chapter 18: Developer Tools
• Chapter 19: Angular Best Practices
• Chapter 20: Angular Testing
• [Chapter 21: Angular Material](#[chapter-21 Angular-material(https://github.com/anilsingh581/Angular-Interview-Questions-Answers-Examples/blob/main/Angular-Material-Example)])

1. Core Concepts

Q: What is Angular and its key features?
A: Angular is a TypeScript-based framework for building dynamic web apps. Key features: two-way data binding, dependency injection, and component-based architecture.

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2. Components & Templates

Q: How do you create a component in Angular?
A: Use @Component decorator with a selector, template, and styles. Example: ng generate component my-component.

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3. Directives

Q: What are structural directives?
A: Directives like *ngIf and *ngFor that modify DOM structure. Example: <div *ngIf="isVisible">Content</div>.

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4. Dependency Injection

Q: How does DI work in Angular?
A: Angular’s injector provides services to components. Example: constructor(private service: MyService) {}.

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5. Routing

Q: How do you configure a route in Angular?
A: Define routes in RouterModule with path and component. Example: { path: 'home', component: HomeComponent }.

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6. Forms

Q: What’s the difference between template-driven and reactive forms?
A: Template-driven uses directives in HTML; reactive uses FormGroup in TypeScript for more control.

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7. HTTP Client

Q: How do you fetch data with HttpClient?
A: Inject HttpClient and use get(). Example: this.http.get('api/data').subscribe(data => console.log(data)).

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8. RxJS

Q: What are Observables in Angular?
A: Streams of data handled asynchronously. Example: interval(1000).subscribe(val => console.log(val)).

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9. Performance & Optimization

Q: How do you optimize Angular apps?
A: Use lazy loading, OnPush change detection, and Ahead-of-Time (AOT) compilation.

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10. Testing

Q: How do you write a unit test for a component?
A: Use Jasmine/Karma. Example: it('should render title', () => { expect(component.title).toBe('MyApp'); }).

How to Run

• Clone this repository:

  git clone [angular-interview-examples](https://github.com/anilsingh581/Angular-Components.git)
• Navigate into the folder:

  cd angular-interview-examples
• Install dependencies:

  npm install
• Run the Angular application:

  ng serve