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Top Angular Interview Questions and Answers for 2024

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Top Angular Interview Questions and Answers for 2024

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Prepare for your interview with these top Angular questions and answers. Boost your confidence and ace your interview.

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Table of Contents for Angular questions and answers

No.Questions
1What is Angular Framework?
2What is the difference between AngularJS and Angular?
3What is TypeScript?
4Write a pictorial diagram of Angular architecture?
5What are the key components of Angular?
6What are directives?
7What are components?
8What are the differences between Component and Directive?
9What is a template?
10What is a module?
11What are lifecycle hooks available?
12What is a data binding?
13What is metadata?
14What is Angular CLI?
15What is the difference between constructor and ngOnInit?
16What is a service
17What is dependency injection in Angular?
18How is Dependency Hierarchy formed?
19What is the purpose of async pipe?
20What is the option to choose between inline and external template file?
21What is the purpose of *ngFor directive?
22What is the purpose of ngIf directive?
23What happens if you use script tag inside template?
24What is interpolation?
25What are template expressions?
26What are template statements?
27How do you categorize data binding types?
28What are pipes?
29What is a parameterized pipe?
30How do you chain pipes?
31What is a custom pipe?
32Give an example of custom pipe?
33What is the difference between pure and impure pipe?
34What is a bootstrapping module?
35What are observables?
36What is HttpClient and its benefits?
37Explain on how to use HttpClient with an example?
38How can you read full response?
39How do you perform Error handling?
40What is RxJS?
41What is subscribing?
42What is an observable?
43What is an observer?
44What is the difference between promise and observable?
45What is multicasting?
46How do you perform error handling in observables?
47What is the shorthand notation for subscribe method?
48What are the utility functions provided by RxJS?
49What are observable creation functions?
50What will happen if you do not supply handler for the observer?
51What are Angular elements?
52What is the browser support of Angular Elements?
53What are custom elements?
54Do I need to bootstrap custom elements?
55Explain how custom elements works internally?
56How to transfer components to custom elements?
57What are the mapping rules between Angular component and custom element?
58How do you define typings for custom elements?
59What are dynamic components?
60What are the various kinds of directives?
61How do you create directives using CLI?
62Give an example for attribute directives?
63What is Angular Router?
64What is the purpose of base href tag?
65What are the router imports?
66What is router outlet?
67What are router links?
68What are active router links?
69What is router state?
70What are router events?
71What is activated route?
72How do you define routes?
73What is the purpose of Wildcard route?
74Do I need a Routing Module always?
75What is Angular Universal?
76What are different types of compilation in Angular?
77What is JIT?
78What is AOT?
79Why do we need compilation process?
80What are the advantages with AOT?
81What are the ways to control AOT compilation?
82What are the restrictions of metadata?
83What are the three phases of AOT?
84Can I use arrow functions in AOT?
85What is the purpose of metadata json files?
86Can I use any javascript feature for expression syntax in AOT?
87What is folding?
88What are macros?
89Give an example of few metadata errors?
90What is metadata rewriting?
91How do you provide configuration inheritance?
92How do you specify angular template compiler options?
93How do you enable binding expression validation?
94What is the purpose of any type cast function?
95What is Non null type assertion operator?
96What is type narrowing?
97How do you describe various dependencies in angular application?
98What is zone?
99What is the purpose of common module?
100What is codelyzer?
101What is angular animation?
102What are the steps to use animation module?
103What is State function?
104What is Style function?
105What is the purpose of animate function?
106What is transition function?
107How to inject the dynamic script in angular?
108What is a service worker and its role in Angular?
109What are the design goals of service workers?
110What are the differences between AngularJS and Angular with respect to dependency injection?
111What is Angular Ivy?
112What are the features included in ivy preview?
113Can I use AOT compilation with Ivy?
114What is Angular Language Service?
115How do you install angular language service in the project?
116Is there any editor support for Angular Language Service?
117Explain the features provided by Angular Language Service?
118How do you add web workers in your application?
119What are the limitations with web workers?
120What is Angular CLI Builder?
121What is a builder?
122How do you invoke a builder?
123How do you create app shell in Angular?
124What are the case types in Angular?
125What are the class decorators in Angular?
126What are class field decorators?
127What is declarable in Angular?
128What are the restrictions on declarable classes?
129What is a DI token?
130What is Angular DSL?
131What is an rxjs Subject?
132What is Bazel tool?
133What are the advantages of Bazel tool?
134How do you use Bazel with Angular CLI?
135How do you run Bazel directly?
136What is platform in Angular?
137What happens if I import the same module twice?
138How do you select an element with in a component template?
139How do you detect route change in Angular?
140How do you pass headers for HTTP client?
141What is the purpose of differential loading in CLI?
142Is Angular supports dynamic imports?
143What is lazy loading?
144What are workspace APIs?
145How do you upgrade angular version?
146What is Angular Material?
147How do you upgrade location service of angularjs?
148What is NgUpgrade?
149How do you test Angular application using CLI?
150How to use polyfills in Angular application?
151What are the ways to trigger change detection in Angular?
152What are the differences of various versions of Angular?
153What are the security principles in angular?
154What is the reason to deprecate Web Tracing Framework?
155What is the reason to deprecate web worker packages?
156How do you find angular CLI version?
157What is the browser support for Angular?
158What is schematic
159What is rule in Schematics?
160What is Schematics CLI?
161What are the best practices for security in angular?
162What is Angular security model for preventing XSS attacks?
163What is the role of template compiler for prevention of XSS attacks?
164What are the various security contexts in Angular?
165What is Sanitization? Is angular supports it?
166What is the purpose of innerHTML?
167What is the difference between interpolated content and innerHTML?
168How do you prevent automatic sanitization?
169Is safe to use direct DOM API methods in terms of security?
170What is DOM sanitizer?
171How do you support server side XSS protection in Angular application?
172Is angular prevents http level vulnerabilities?
173What are Http Interceptors?
174What are the applications of HTTP interceptors?
175Is multiple interceptors supported in Angular?
176How can I use interceptor for an entire application?
177How does Angular simplifies Internationalization?
178How do you manually register locale data?
179What are the four phases of template translation?
180What is the purpose of i18n attribute?
181What is the purpose of custom id?
182What happens if the custom id is not unique?
183Can I translate text without creating an element?
184How can I translate attribute?
185List down the pluralization categories?
186What is select ICU expression?
187How do you report missing translations?
188How do you provide build configuration for multiple locales?
189What is an angular library?
190What is AOT compiler?
191How do you select an element in component template?
192What is TestBed?
193What is protractor?
194What is collection?
195How do you create schematics for libraries?
196How do you use jquery in Angular?
197What is the reason for No provider for HTTP exception?
198What is router state?
199How can I use SASS in angular project?
200What is the purpose of hidden property?
201What is the difference between ngIf and hidden property?
202What is slice pipe?
203What is index property in ngFor directive?
204What is the purpose of ngFor trackBy?
205What is the purpose of ngSwitch directive?
206Is it possible to do aliasing for inputs and outputs?
207What is safe navigation operator?
208Is any special configuration required for Angular9?
209What are type safe TestBed API changes in Angular9?
210Is mandatory to pass static flag for ViewChild?
211What are the list of template expression operators?
212What is the precedence between pipe and ternary operators?
213What is an entry component?
214What is a bootstrapped component?
215How do you manually bootstrap an application?
216Is it necessary for bootstrapped component to be entry component?
217What is a routed entry component?
218Why is not necessary to use entryComponents array every time?
219Do I still need to use entryComponents array in Angular9?
220Is it all components generated in production build?
221What is Angular compiler?
222What is the role of ngModule metadata in compilation process?
223How does angular finds components, directives and pipes?
224Give few examples for NgModules?
225What are feature modules?
226What are the imported modules in CLI generated feature modules?
227What are the differences between ngmodule and javascript module?
228What are the possible errors with declarations?
229What are the steps to use declaration elements?
230What happens if browserModule used in feature module?
231What are the types of feature modules?
232What is a provider?
233What is the recommendation for provider scope?
234How do you restrict provider scope to a module?
235How do you provide a singleton service?
236What are the different ways to remove duplicate service registration?
237How does forRoot method helpful to avoid duplicate router instances?
238What is a shared module?
239Can I share services using modules?
240How do you get current direction for locales??
241What is ngcc?
242What classes should not be added to declarations?
243What is ngzone?
244What is NoopZone?
245How do you create displayBlock components?
246What are the possible data change scenarios for change detection?
247What is a zone context?
248What are the lifecycle hooks of a zone?
249Which are the methods of NgZone used to control change detection?
250How do you change the settings of zonejs?
251How do you trigger an animation?
252How do you configure injectors with providers at different levels?
253Is it mandatory to use injectable on every service class?
254What is an optional dependency?
255What are the types of injector hierarchies?
256What are reactive forms?
257What are dynamic forms?
258What are template driven forms?
259What are the differences between reactive forms and template driven forms?
260What are the different ways to group form controls?
261How do you update specific properties of a form model?
262What is the purpose of FormBuilder?
263How do you verify the model changes in forms?
264What are the state CSS classes provided by ngModel?
265How do you reset the form?
266What are the types of validator functions?
267Can you give an example of built-in validators?
268How do you optimize the performance of async validators?
269How to set ngFor and ngIf on the same element?
270What is host property in css?
271How do you get the current route?
272What is Component Test Harnesses?
273What is the benefit of Automatic Inlining of Fonts?
274What is content projection?
275What is ng-content and its purpose?
276What is standalone component?
277How to create a standalone component uing CLI command?
278How to create a standalone component manually?
279What is hydration ?
280How you can refresh angular component without reloading or refreshing your component? (Most popular, see below)
Angular questions and answers | Preparation for 2024

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Rakshit Shah

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Hey Moodies, Kem chho ? - Majama? (Yeah, You guessed Right! I am from Gujarat, India) 25, Computer Engineer, Foodie, Gamer, Coder and may be a Traveller . > If I can’t, who else will? < You can reach out me by “Rakshitshah94” on 9MOod, Quora, Medium, Github, Instagram, snapchat, twitter, Even you can also google it to see me. I am everywhere, But I am not God. Feel free to text me.

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