Q: What are functional HTTP Interceptors in modern Angular, and how do you register them?

**Target Audience:** Developers who have used HttpClient and want to add cross-cutting HTTP behaviour the modern way — no prior interceptor knowledge needed. **Difficulty:** Easy to Medium > **How to read this doc:** Plain language first, then 📌 Interview term: callouts with the vocabulary an interviewer listens for. Every output, ordering claim and error message below was produced by compiling the example with ngc (strict templates) on Angular 22.2.3 and

Question 1

What are components and modules in Angular?

Accepted Answer

**Target Audience:** Anyone preparing for an Angular interview — assumes basic TypeScript classes, no Angular required. **Difficulty:** Easy > **How to read this doc:** Plain language first, then 📌 Interview term: callouts with the vocabulary an interviewer expects. Every output and error message quoted below was produced by compiling the code with ngc (strict templates) on Angular 22.2.3 and running it. ## 1. Why This Even Matters — A Story First Think of a restaur

Question 2

What is Angular and how does it differ from AngularJS?

Accepted Answer

**Target Audience:** Anyone preparing for an Angular interview — assumes basic JavaScript, no Angular or AngularJS required. **Difficulty:** Easy > **How to read this doc:** Ideas are explained in plain language first, then tagged with 📌 Interview term: so you also learn the words an interviewer listens for. The output in section 5 was produced by compiling and running the example on Angular 22.2.3, and the default-behaviour claims in section 6 were read from the Angular 22.2.3 pa

Question 3

What does the Angular CLI provide?

Accepted Answer

**Target Audience:** Anyone preparing for an Angular interview — no Angular experience needed. **Difficulty:** Easy > **How to read this doc:** Plain language first, then 📌 Interview term: callouts. Everything under "Verified" was produced by running Angular CLI 22.2.3 in a sandbox: ng new, ng generate --dry-run, ng serve, ng build, ng test and ng lint, with the real output quoted. ng add an

Question 4

What are standalone components?

Accepted Answer

**Target Audience:** Developers preparing for an Angular interview who know what a component is and have seen, or heard of, NgModules. **Difficulty:** Easy > **How to read this doc:** Plain language first, then 📌 Interview term: callouts. Everything under a "Verified" heading was compiled with ngc on Angular 22.2.3 and run; the lazy-loading log in section 5 came from a real provideRouter setup. ## 1. Why This Even Matters — A Story First Picture packing

Question 5

How do functional interceptors work with provideHttpClient()?

Accepted Answer

**Target Audience:** Developers who can already write a basic interceptor and want to understand the chain well enough to debug ordering problems. **Difficulty:** Medium > **How to read this doc:** Plain language first, then 📌 Interview term: callouts. The internals described here were read from the installed @angular/common 22.2.3 source, and every ordering claim was produced by running instrumented interceptors (compiled with ngc, booted in jsdom with a

Question 6

How do functional route guards and lazy loadComponent work in modern Angular?

Accepted Answer

**Target Audience:** Developers using standalone components and lazy routes who want to know exactly what downloads when — assumes you know [route guards](/interview-question/what-are-route-guards-in-angular) and [lazy loading](/interview-question/how-does-routing-and-lazy-loading-work-in-angular). **Difficulty:** Medium to Hard > **How to read this doc:** Plain language first, then 📌 Interview term: callouts. Every "loader called" line below was printed by a real loader function

Question 7

What is a directive and what are the types?

Accepted Answer

**Target Audience:** Developers who use components daily and want a clear map of Angular's directive types, and how to write their own. **Difficulty:** Easy to Medium > **How to read this doc:** Plain language first, then 📌 Interview term: callouts. The rendered output and event behaviour below were produced on Angular 22.2.3 by compiling the example with ngc (strict templates) and driving it in jsdom; the compiled definitions were read from ngc output an

Question 8

Standalone bootstrapApplication — how does Angular bootstrap without NgModules in 2025?

Accepted Answer

**Target Audience:** Developers who can bootstrap an app and now want to explain what happens underneath, for senior interviews or for debugging startup problems. **Difficulty:** Medium to Hard > **How to read this doc:** Plain language first, then 📌 Interview term: callouts. The sequence below was read from the installed Angular 22.2.3 source (bootstrapApplication in @angular/platform-browser, internalCreateApplication and bootstrap

Question 9

What are functional HTTP Interceptors in modern Angular, and how do you register them?

Accepted Answer

**Target Audience:** Developers who have used HttpClient and want to add cross-cutting HTTP behaviour the modern way — no prior interceptor knowledge needed. **Difficulty:** Easy to Medium > **How to read this doc:** Plain language first, then 📌 Interview term: callouts with the vocabulary an interviewer listens for. Every output, ordering claim and error message below was produced by compiling the example with ngc (strict templates) on Angular 22.2.3 and

Question 10

How does Dependency Injection work in Angular?

Accepted Answer

**Target Audience:** Developers new to Angular, or who use services daily without knowing what builds them. Assumes TypeScript classes; no DI background needed. **Difficulty:** Medium > **How to read this doc:** Ideas are explained in plain language first, then tagged with 📌 Interview term: so you also learn the words an interviewer listens for. Every output block below was produced by compiling and running the code on Angular 22.2.3; the injector chain and error messages were pri

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Easy

What are components and modules in Angular?

What is Angular and how does it differ from AngularJS?

What does the Angular CLI provide?

What are standalone components?

Medium

How do functional interceptors work with provideHttpClient()?

How do functional route guards and lazy loadComponent work in modern Angular?

What is a directive and what are the types?

Standalone bootstrapApplication — how does Angular bootstrap without NgModules in 2025?

What are functional HTTP Interceptors in modern Angular, and how do you register them?

How does Dependency Injection work in Angular?

How do you bootstrap a standalone Angular application?

What is provideHttpClient(withInterceptors([...])) and how does it replace legacy HTTP interceptor providing?

Hard

What are Deferrable Views (@defer) and how do they work in Angular 17+?

What is NgRx?

Deferrable views — prefetch strategies and dependency isolation with @defer?

How do you dynamically create components?