Question 1

What is the difference between the constructor and ngOnInit?

Accepted Answer

**Target Audience:** Anyone preparing for an Angular interview who knows what a component and an input are. **Difficulty:** Easy > **How to read this doc:** Plain language first, then 📌 Interview term: callouts. The call order, the NG0950 runtime error and the NG8118 compiler error below were all produced by compiling and running the example on Angular 22.2.3. ## 1. Why This Even Matters — A Story First Think of a new employee's first day. Before they arrive, HR builds their des

Question 2

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 3

How has the Angular build changed with esbuild + Vite (ng build / ng serve)?

Accepted Answer

**Target Audience:** Developers who know Angular apps but not the build tooling underneath the [CLI](/interview-question/what-does-the-angular-cli-provide); useful before an upgrade from webpack-era projects. **Difficulty:** Medium > **How to read this doc:** Plain language first, then 📌 Interview term: callouts. All terminal output below was produced by running Angular CLI 22.2.3 on a fresh ng new app (one lazy route added) under Node 24: ng build,

Question 4

What is the difference between AOT and JIT compilation?

Accepted Answer

**Target Audience:** Anyone preparing for an Angular interview who has heard "AOT" and "JIT" but could not say what concretely differs. **Difficulty:** Easy to Medium > **How to read this doc:** Plain language first, then 📌 Interview term: callouts. Every number and error below was produced on Angular 22.2.3: bundle sizes by running [CLI](/interview-question/what-does-the-angular-cli-provide) 22.2.3 ng build with and without --aot=false on the same app; t

Question 5

What are security vulnerabilities in Angular apps, and how does DomSanitizer prevent XSS?

Accepted Answer

**Target Audience:** Angular developers preparing for security questions; no security background assumed. **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. Sections 4 and 5 quote output from running both examples on Angular 22.2.3 (the first in AOT and playground modes, identical output). The CSP, XSRF and SSR findings came from a CLI 22.2.3 buil

Question 6

What is ViewEncapsulation in Angular?

Accepted Answer

**Target Audience:** Anyone who has written CSS for an Angular component — basic CSS selectors assumed, no Shadow DOM knowledge needed. **Difficulty:** Easy > **How to read this doc:** Plain language first, then 📌 Interview term: callouts with the vocabulary an interviewer expects. The enum values were read from the Angular 22.2.3 typings, and every computed style, attribute and stylesheet quoted below was produced by compiling and running the example on 22.2.3 in jsdom. ## 1. Wh

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