WalzoneInterview Prep
📞 Interviewing soon? Practice with a realistic AI mock phone interview — it calls you, then scores you. First 15 min FREE →

100 Angular Interview Questions and Answers

Web & Backend · 100 questions, each with a full written answer — free, no sign-up.

Reading is step one. Saying it out loud is the interview. Our AI interviewer calls your phone and runs a realistic Angular interview — then scores it.
📞 Practice Angular — free 15 min
📕 Buy this interview preparation book: 100 Angular questions & answers — PDF + EPUB for $5
Basic 20Intermediate 20Advanced 20Expert 20Guru 20

Basic

  1. What is Angular and why is it used?
  2. Can you briefly explain the architecture of an Angular application?
  3. What are Angular components and how do they interact with each other?
  4. What is the difference between AngularJS and Angular?
  5. What are Angular directives? Can you name a few built-in directives?
  6. What is data binding in Angular? Can you explain the different types of data binding?
  7. What are Angular services and how are they used?
  8. What is dependency injection in Angular and why is it important?
  9. Can you explain the difference between reactive and template-driven forms in Angular?
  10. What are Angular modules and how do they help in organizing the application?
  11. What is the purpose of Angular pipes? Can you give an example of a built-in pipe?
  12. How do you create a custom pipe in Angular?
  13. What is routing in Angular and why is it important for single-page applications (SPAs)?
  14. What are Angular decorators and what is their purpose?
  15. How do you handle events in Angular, and can you provide an example of event binding?
  16. What are Observables and how are they used in Angular?
  17. What is the purpose of the ngOnInit lifecycle hook in Angular?
  18. How do you perform HTTP requests in Angular? Can you provide an example using HttpClient?
  19. What is Angular Material and how can it be used to create a consistent user interface?
  20. What are some best practices for writing clean and maintainable Angular code?

Intermediate

  1. What is the difference between ElementRef, TemplateRef, and ViewContainerRef in Angular?
  2. What are the various change detection strategies in Angular and when to use them?
  3. Can you explain the concept of Lazy Loading in Angular and why it’s beneficial?
  4. What is the difference between the ngOnChanges and ngDoCheck lifecycle hooks?
  5. How do you handle global state management in Angular applications using services and RxJS?
  6. What is the difference between switchMap, mergeMap, and concatMap in RxJS? Can you provide a use case for each?
  7. How can you create and use a shared module in Angular?
  8. What are Content Projection and ng-content in Angular?
  9. How do you implement internationalization (i18n) in Angular applications?
  10. What is the Angular Ahead-of-Time (AOT) compiler, and how does it improve application performance?
  11. How can you implement authentication and authorization in Angular applications?
  12. What is the purpose of host listeners and host bindings in Angular?
  13. Can you explain the concept of ControlValueAccessor and its use in custom form controls in Angular?
  14. How do you create and use custom validators in Angular forms?
  15. What is the purpose of ViewChild and ViewChildren decorators in Angular?
  16. How do you handle error handling and reporting in Angular applications?
  17. What is Angular Universal and how does it help with server-side rendering (SSR)?
  18. How do you optimize Angular application performance through Change Detection and Zone.js?
  19. Can you explain the concept of dynamic components and their use cases in Angular?
  20. How do you implement state management in Angular applications using NgRx?

Advanced

  1. What are the differences between the microsyntax *ngIf and [ngIf]? When should you use each?
  2. How do you implement custom change detection in Angular, and what are the benefits?
  3. Can you explain the difference between merge and forkJoin in RxJS and provide a use case for each?
  4. What is the role of the Renderer2 class in Angular, and how do you use it?
  5. How do you create and work with dynamic forms in Angular?
  6. What are Higher-Order Observable operators in RxJS, and can you provide some examples?
  7. How do you use Web Workers in Angular to offload intensive tasks to a separate thread?
  8. How can you create, test, and deploy Angular libraries?
  9. What are some advanced Angular performance optimization techniques, such as using trackBy with *ngFor?
  10. How can you integrate Angular applications with third-party libraries and APIs, such as D3.js or Google Maps?
  11. What are the differences between cold and hot Observables in RxJS? Can you provide examples of each?
  12. Can you explain the concept of tree-shakable providers in Angular and their benefits?
  13. How do you implement a custom error handler in Angular applications?
  14. What are the different ways of implementing Animations in Angular? Can you provide examples?
  15. How do you set up and use Angular Schematics for customizing the CLI?
  16. Can you explain the role of Zone.js in Angular and its relationship with change detection?
  17. How do you create and manage feature flags in Angular applications?
  18. What is Angular Ivy, and how does it improve the application build size and performance?
  19. Can you explain the concept of pure and impure pipes in Angular and provide use cases for each?
  20. How do you implement server-side pagination, sorting, and filtering in Angular applications?

Expert

  1. How can you implement a custom Angular compiler plugin, and what are some use cases for doing so?
  2. What is the difference between catchError and finalize operators in RxJS? Can you provide examples?
  3. How do you use Angular Elements to create custom web components that can be used outside of Angular applications?
  4. Can you explain the concept of partial hydration and its implications on performance in Angular applications?
  5. How do you create and configure custom Angular Schematics to enforce organization-specific coding standards and practices?
  6. What is the difference between the share and shareReplay operators in RxJS, and when should you use each?
  7. Can you explain the Angular Compiler options, such as strictTemplates and strictInjectionParameters, and how they can help improve application quality?
  8. How do you implement advanced state management patterns in Angular applications using libraries like Akita or MobX?
  9. How do you use Angular’s reactive form APIs to create complex form structures and handle validation scenarios?
  10. What are some strategies for implementing advanced caching and cache invalidation in Angular applications?
  11. How do you create and manage custom Angular decorators for metadata, properties, or methods?
  12. How can you implement advanced animation techniques in Angular, such as staggering, group animations, or custom animation triggers?
  13. What are some best practices for setting up a scalable and maintainable Angular project structure?
  14. How do you implement offline-first strategies in Angular applications using technologies like Service Workers or IndexedDB?
  15. Can you explain the concept of two-way data binding in Angular and how it differs from one-way data binding techniques?
  16. How do you effectively use TypeScript features such as strict mode, type guards, and conditional types in Angular applications?
  17. What are some strategies for managing complex side effects in Angular applications using RxJS and Effects?
  18. How can you ensure accessibility and compliance with WCAG guidelines in Angular applications?
  19. How do you set up and manage end-to-end (E2E) testing in Angular applications using tools like Cypress or Protractor?
  20. What are some advanced techniques for optimizing Angular application build and runtime performance, such as code-splitting and lazy-loading specific routes or components?

Guru

  1. Can you explain how the Angular Compiler works under the hood and the different stages of the compilation process?
  2. How do you implement advanced performance monitoring and profiling in Angular applications to identify and resolve bottlenecks?
  3. What are some techniques for creating reusable and composable UI components with complex behavior in Angular?
  4. How do you handle complex state synchronization and conflict resolution in Angular applications, especially in distributed environments?
  5. Can you explain the inner workings of the Angular change detection mechanism and how it impacts application performance?
  6. What are some advanced use cases for custom Angular decorators, and how can they help improve code quality and maintainability?
  7. How do you effectively use Angular Schematics and Builders to create custom workflows and improve developer productivity?
  8. Can you explain the concept of pre-rendering in Angular and its benefits for search engine optimization (SEO) and performance?
  9. How do you implement advanced error handling and reporting mechanisms in Angular applications, including capturing and analyzing telemetry data?
  10. What are some techniques for optimizing Angular application startup time, such as using differential loading or the App Shell technique?
  11. Can you explain the inner workings of the Angular router, including the different stages of the routing process and how it impacts application performance?
  12. How do you implement advanced security features in Angular applications, such as content security policy (CSP), secure cookie management, and protection against common web vulnerabilities?
  13. What are some advanced techniques for handling UI state and layout in Angular applications, including responsive design, theming, and component composition?
  14. How can you create and use custom RxJS operators and utilities to streamline complex asynchronous operations in Angular applications?
  15. How do you integrate Angular applications with complex back-end systems, such as real-time databases, message brokers, or event-driven architectures?
  16. What are some strategies for implementing progressive enhancement and graceful degradation in Angular applications to ensure compatibility across different browsers and devices?
  17. Can you explain the process of upgrading a large-scale Angular application from an older version to the latest version, including potential challenges and best practices?
  18. How do you set up and manage continuous integration and deployment (CI/CD) pipelines for Angular applications, including automated testing, performance monitoring, and release management?
  19. What are some advanced techniques for managing state in Angular applications, such as using reactive programming patterns or functional programming techniques?
  20. Can you discuss the future of Angular and its ecosystem, including upcoming features, potential improvements, and community-driven initiatives?
📕 Buy this interview preparation book: 100 Angular questions & answers — PDF + EPUB for $5
Reading is step one. Saying it out loud is the interview. Our AI interviewer calls your phone and runs a realistic Angular interview — then scores it.
📞 Practice Angular — free 15 min
More in Web & Backend: JavaScriptTypeScriptNode.jsRESTful Web Services