Top 90+ Angular Interview Questions And Answers


    1. What is Angular and what are its key features ?
    2. What is a Single page application ?
    3. What is a component in Angular ?
    4. What are the lifecycle hooks in an Angular component ?
    5. How to implement routing in Angular web components ?
    6. What is lazy loading in Angular ?
    7. What are the ways to share data between 2 components ?
    8. What are custom directives in Angular and how to create them ?
    9. What is the difference between ng serve and npm start ?
    10. What is the difference between ng add and npm install ?
    11. Can we use jQuery in Angular 2/4/5 ?
    12. How to call an API in Angular ?
    13. What is the difference between 'dependencies' and 'dev-dependencies' properties in package.json ?
    14. What is replay subject in angular ?
    15. What is the difference between adding styles and scripts in angular.json and adding styles and scripts in index.html ?
    16. What is the difference between cold observables and hot observables ?
    17. What are the properties inside @ngModule decorator ?
    18. How to generate a component using cli command without creating its spec file ?
    19. What is RxJS ?
    20. HttpClientModule was introduced in which version of Angular ?
    21. Is it necessary to define a constructor in a component ?
    22. What are the security features in angular ?
    23. What is testbed in Jasmine ?
    24. What is the difference between Subject and Behaviour Subject ?
    25. What are the advantage of using observable instead of promise for http request ?
    26. Difference between authorization and authentication. Explain the basic difference and also in the context of an angular application ?
    27. What is AOT in Angular ?
    28. How to create custom pipe in Angular ?
    29. What are inbuilt Angular pipes ?
    30. Explain Software version nomenclature (semantic versioning) ?
    31. What is storybook in Angular ?
    32. What are the design patterns in Angular ?
    33. What are the disadvantages of AOT ?
    34. What is the use of tilde(~) and caret(^) sign in package.json ?
    35. What are interceptors in Angular ?
    36. Can we rename dist folder in Angular Project ?
    37. How would the browser Know that your app is an Angular based app ?
    38. How to create a custom decorator in Angular ?
    39. How to make multiple http calls in parallel in Angular ?
    40. What is a module in TypeScript, and how can you use it ?
    41. How to hit an API before the loading of the appComponent ?
    42. If there is a package(or say library) that is not available through NPM , then how would you use it in your angular application ?
    43. How to implement treeshaking in Angular ?
    44. What can be the values of 'providedIn' property of @injectable decorator ?
    45. How to optimize Angular application using OnPush change detection strategy ?
    46. What is the latest Angular version and what are the new features added in it ?
    47. What are the types of forms available in Angular ? Explain with syntax.
    48. What are dynamic forms and how to create them in Angular ?
    49. How to show error messages on form controls ?
    50. How to use a service only for a specific component instead of the whole module ?
    51. Can you put ngIf and ngFor on same element ?
    52. What's the difference between Observable and Subject ?
    53. How does ng serve work ?
    54. How to improve Angular app performance ?
    55. What is AuthGuard in Angular ?
    56. Explain the canActivateChild route guard ?
    57. What is the difference between Canload and canActivate route guards ?
    58. Explain switch map , mergemap , forkjoin, combineLatest, concatMap, exhaustMap . what would happen if any of the requests fails in switch map , merge map or forkjoin ?
    59. What is dependency injection ?
    60. What's the difference between debounce and setTimeout ?
    61. What are RxJS key features ?
    62. How do you handle errors in RxJS observables ?
    63. How do you implement backpressure in RxJS ?
    64. What is the purpose of operators in RxJS, and can you give an example of a common operator ?
    65. Can you explain what is the purpose of using schedulers in RxJS, and give an example of a common scheduler ?
    66. What is the difference between a pipeable operator and a patch operator in RxJS ?
    67. What are services in Angular ?
    68. What is the difference between AOT and JIT ?
    69. What are the different building blocks of Angular ?
    70. How do you use the retry() operator in RxJS, and what is its purpose ?
    71. What is Angular change detection and how does it work ?
    72. What is zone js in Angular ?
    73. How to dynamically create form fields with FormArray in Angular ?
    74. What is ngZone in Angular ?
    75. Can event triggered in parent cause change detection in child with OnPush strategy in Angular ?
    76. Can event triggered in child cause change detection in parent with OnPush strategy in Angular ?
    77. How to optimize an Angular application ?
    78. Explain pure and impure pipe in Angular ?
    79. Explain unit testing in Angular ?
    80. How to test an Angular Service ?
    81. Explain ngAfterContentInit hooks ?
    82. Explain ngAfterViewInit hook with example ?
    83. Difference between ngAfterContentInit and ngAfterViewInit ?
    84. What is View Encapsulation in Angular ?
    85. What is the use of polyfills ?
    86. What is scan operator in RxJS ?
    87. How does spyOn work in Angular ?
    88. How to mock http request in Angular ?
    89. What is the difference between 'from' and 'of' operator in RxJS ?
    90. What is reduce operator in RxJS ?
    91. What is the use of trackBy in Angular ?


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