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All Angular Interview Questions

Practice the complete collection of Angular interview questions including theory, coding, MCQs and real interview problems.

Total Questions: 100Topics: 20Complete interview preparation

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All Angular Interview Questions (100)

Scroll through every important Angular question asked in real interviews. Includes MCQs, subjective questions, and coding prompts.

1. Why was a client-side framework like Angular introduced?

Difficulty: EasyType: SubjectiveTopic: Angular vs AngularJS

Client-side frameworks like Angular were introduced to make modern web applications more interactive and maintainable. Earlier, developers had to manually update the DOM using plain JavaScript or jQuery, which became messy for large applications. Angular introduced Single Page Applications (SPAs), data binding, and component-based architecture to keep UI and logic in sync automatically, improve reusability, and organize code effectively.

2. How does an Angular application work?

Difficulty: MediumType: SubjectiveTopic: Angular vs AngularJS

An Angular app is a Single Page Application (SPA) that runs in the browser. It starts with the main.ts file, which bootstraps the AppModule using the bootstrapModule() function. AppModule groups components and services. The AppComponent defines the main view, while index.html loads the root selector <app-root>. Angular uses data binding, directives, and dependency injection to dynamically update the UI without reloading the page.

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All Angular Interview Questions

Overview

1. Why was a client-side framework like Angular introduced?

2. How does an Angular application work?

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3. How are Angular expressions different from JavaScript expressions?

4. What are Single Page Applications (SPAs)?

5. What are templates in Angular?

6. What is an AOT compiler in Angular?

7. How many types of compilation does Angular provide?

8. What is a component in Angular?

9. Explain the purpose of the @Component decorator in Angular.

10. What is a module in Angular?

11. What is the Angular CLI and why is it useful?

12. Explain the purpose of the @Component decorator.

13. What is a module in Angular and what does @NgModule do?

14. What are templates in Angular and how can you define them?

15. What is a directive? Name the main types with examples.

16. What is a service and how does dependency injection work in Angular?

17. What kinds of data binding does Angular support?

18. Explain two-way data binding with an example.

19. Compare string interpolation and property binding.

20. What are Angular lifecycle hooks and when do you use them?

21. What is the difference between Angular and AngularJS?

22. When would you choose one-way binding vs two-way binding?

23. How do you pass data between parent and child components?

24. What is the Angular Router and how does navigation work in an SPA?

25. Explain lazy loading and why it matters.

26. What is a pipe in Angular and when would you create a custom one?

27. What is Angular Universal and what benefits does it bring?

28. What are HTTP interceptors and a common use case?

29. What is NgZone and how does it help Angular update the view?

30. How do you protect routes so only logged-in users can access them?

31. What is a directive in Angular and when would you create one?

32. What is a service in Angular and how is it injected?

33. Explain two-way data binding and how you enable it.

34. Walk me through key Angular lifecycle hooks you actually use.

35. How is Angular different from AngularJS?

36. List the data binding types in Angular with a quick example each.

37. What is string interpolation and how is it different from property binding?

38. What is an Angular module and what lives in declarations vs imports vs providers?

39. How does Angular CLI help your workflow?

40. Explain how Angular Router changes views without reloading the page.

41. How do you lazy load a feature module and why?

42. What are Angular HTTP interceptors and a common use case?

43. When would you use NgZone or runOutsideAngular?

44. How do route guards protect Angular routes?

45. How do you pass data from a parent component to a child component?

46. How can a child component send data or events to its parent?

47. When would you use @ViewChild and what are the caveats?

48. Explain lazy loading in Angular and how to configure it.

49. How does the Angular Router enable Single Page Application behavior?

50. What are Angular Guards and when would you use CanActivate vs CanLoad?

51. What is a Resolver and why is it useful?

52. What are HTTP interceptors and common use cases?

53. What is NgZone and how does it relate to change detection?

54. When should you use the OnPush change detection strategy?

55. What is Angular Universal and what problems does it solve?

56. What are Standalone Components and how do they simplify apps?

57. What are Typed Forms and why do they matter?

58. What is the Signal API and when would you prefer it over services with Subjects?

59. Explain Angular’s template syntax at a high level.

60. What are structural directives and how do *ngIf and *ngFor work?

61. When do you create a custom attribute directive and what does it look like?

62. How do NgClass and NgStyle help with dynamic styling?

63. Name a few built-in pipes and typical use cases.

64. How do you create a custom pipe and when should it be pure?

65. What are parameterized pipes? Give an example.

66. Explain Angular’s view encapsulation modes and when to use each.

67. Why use Renderer2 instead of direct DOM access?

68. Summarize common Angular decorators and their purpose.

69. Give a practical use for ngOnChanges, ngOnInit, and ngOnDestroy.

70. How do you handle HTTP errors with RxJS in components and in an interceptor?

71. How do you add SASS/SCSS to an Angular project?

72. List a few best practices for clean, fast Angular templates.

73. What is the Angular Router and why do SPAs need it?

74. How do you configure routes and render them in a template?

75. How do you read a route parameter like /users/42?

76. When would you use child routes? Show a brief example.

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60. What are structural directives and how do ngIf and ngFor work?