Top 100 Angular Interview Questions

Angular is a popular TypeScript-based framework for building web applications and having a solid understanding of Angular concepts and best practices is essential for a successful career in web development. In this post,

We have curated a diverse range of Angular Interview questions that cover various aspects of Angular, including components, directives, services, modules, dependency injection, routing, testing, and more. Whether you are preparing for a job interview or looking to strengthen your Angular skills, these questions will serve as a valuable resource to assess your knowledge and readiness.

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General Angular Concepts:

1. What is Angular? How does it differ from AngularJS?
2. Explain the key features of Angular.
3. What are the advantages of using Angular?
4. Describe the Angular application architecture.
5. What is the difference between Angular modules and JavaScript modules?
6. Explain the Angular component lifecycle hooks.
7. What are directives in Angular? Provide examples.
8. Differentiate between Angular components and directives.
9. What is Angular CLI? How does it help in Angular development?
10. Explain the concept of data binding in Angular.

Components and Templates:

11. What is an Angular component?
12. How do you create a component in Angular? Provide an example.
13. What is a template in Angular? How is it different from HTML?
14. Explain the concept of interpolation in Angular templates.
15. What are Angular directives? Provide some built-in directives.
16. What is the purpose of the ngFor directive in Angular?
17. How do you pass data from a parent component to a child component?
18. Explain the difference between @ViewChild and @ContentChild decorators.
19. What is Angular template reference variable?
20. How do you handle events in Angular templates?

Services and Dependency Injection:

21. What are Angular services? Why are they used?
22. How do you create a service in Angular? Provide an example.
23. Explain the concept of dependency injection in Angular.
24. What are the benefits of using dependency injection in Angular?
25. How do you inject a service into a component in Angular?
26. What is the difference between @Injectable and @Inject decorators?
27. Explain the concept of hierarchical dependency injection in Angular.
28. How do you provide a different instance of a service for each component in Angular?
29. What is a singleton service in Angular?
30. How do you create a singleton service in Angular?

Routing and Navigation:

31. What is routing in Angular? Why is it used?
32. How do you configure routing in an Angular application?
33. Explain the purpose of router outlets in Angular.
34. What is lazy loading in Angular routing?
35. How do you pass parameters in the route URL in Angular?
36. What is a guard in Angular routing? Provide examples.
37. Explain the concept of route resolvers in Angular.
38. How do you implement nested routing in Angular?
39. What is the purpose of wildcard routes in Angular?
40. How do you handle 404 errors in Angular routing?

Forms and Validation:

41. How do you implement forms in Angular?
42. Explain the difference between template-driven and reactive forms.
43. How do you perform form validation in Angular?
44. What are the different types of form validation techniques in Angular?
45. What is form group in Angular? How is it used?
46. How do you perform asynchronous form validation in Angular?
47. Explain the concept of form builders in Angular.
48. What is the purpose of ngModel directive in Angular forms?
49. How do you handle form submission in Angular?
50. What is form array in Angular? Provide an example.

Directives and Pipes:

51. What are Angular directives? Provide examples.
52. Explain the difference between structural and attribute directives.
53. How do you create a custom directive in Angular? Provide an example.
54. What is the purpose of ng-template directive in Angular?
55. Explain the concept of dynamic component creation in Angular.
56. What are Angular pipes? Provide examples.
57. How do you create a custom pipe in Angular? Provide an example.
58. Explain the purpose of pure and impure pipes in Angular.
59. What is the async pipe in Angular? How is it used?
60. How do you chain multiple pipes in Angular?

Testing and Debugging:

61. What is testing in Angular? Why is it important?
62. How do you write unit tests for Angular components?
63. Explain the purpose of TestBed in Angular testing.
64. How do you write end-to-end tests for Angular applications?
65. What is the purpose of Karma in Angular testing?
66. How do you debug Angular applications in the browser?
67. What are the best practices for testing Angular applications?
68. Explain the concept of mocking in Angular testing.
69. How do you test asynchronous operations in Angular?
70. What is code coverage in Angular testing?

Performance Optimization:

71. What are the key factors for optimizing Angular application performance?
72. Explain the concept of change detection in Angular.
73. How do you optimize change detection in Angular?
74. What is the purpose of trackBy function in ngFor directive?
75. Explain the concept of lazy loading modules for performance optimization.
76. How do you use lazy loading to optimize Angular routing?
77. What is Ahead-of-Time (AOT) compilation in Angular? How does it improve performance?
78. How do you optimize the size of Angular application bundles?
79. Explain the purpose of tree shaking in Angular.
80. How do you optimize rendering performance in Angular?

State Management:

81. What is state management in Angular? Why is it important?
82. Explain the concept of NgRx in Angular.
83. How do you install and configure NgRx in an Angular application?
84. What are actions, reducers, and selectors in NgRx?
85. How do you dispatch actions and handle state changes in NgRx?
86. What are the benefits of using NgRx for state management?
87. Explain the concept of Redux DevTools in NgRx.
88. What are the alternatives to NgRx for state management in Angular?
89. How do you handle complex state management scenarios in Angular?
90. What are the best practices for state management in Angular?

Security and Authentication:

91. How do you handle security in Angular applications?
92. What is Cross-Site Scripting (XSS) and how do you prevent it in Angular?
93. Explain the concept of Cross-Site Request Forgery (CSRF) and how to prevent it in Angular.
94. What is Content Security Policy (CSP)? How do you implement it in Angular?
95. How do you handle authentication and authorization in Angular?
96. What are JSON Web Tokens (JWT) and how do you use them in Angular?
97. Explain the purpose of canActivate and canDeactivate guards in Angular.
98. How do you implement role-based access control in Angular?
99. What are the security best practices for Angular applications?
100. How do you secure Angular applications against common vulnerabilities?

Conclusion (Angular Interview Questions)

This post provided an extensive compilation of 100 Angular interview questions to help you in your preparation for Angular-related job interviews.

By exploring these questions, you can deepen your understanding of Angular concepts, improve your problem-solving skills, and gain confidence in discussing Angular development. Remember, mastering Angular goes beyond memorizing answers – practical experience and continuous learning are crucial.

Use these questions as a starting point and supplement them with further research and hands-on practice. We hope this resource enhances your interview readiness and propels you toward success in your Angular career. Good luck 👍👍👍!