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Angular & JavaScript Interview: Top 400 Questions (2026)

Name: Angular & JavaScript Interview: Top 400 Questions (2026)
Rating: 4.8 (260 reviews)

Crack full stack and front-end Interviews of Angular, JavaScript, HTML, CSS & Bootstrap (with PDF Book)

Highest Rated

Created byHappy Rawat

Last updated 12/2025

English

What you'll learn

Crack Frontend Interviews - Angular, JavaScript, HTML, CSS and Bootstrap Interview Questions
Top 100 JavaScript Interview Question and Answers
Top 200 JavaScript Interview Question and Answers - Coding Included
Top 100 HTML, CSS, Bootstrap Interview Questions
PDF Book for Revision Included

Course content

55 sections • 449 lectures • 14h 46m total length

Course Structure (PDF books attached in resources)2:01

Angular Framework - Introduction0:49
Q1. What is Angular?2:52
Q2. What are Angular advantages?2:42
Q3. What is the difference between AngularJS and Angular?2:43
Q4. What is NPM ?1:33
Q5. What is CLI tool ?1:40
Q6. What is Typescript? What are the advantages of Typescript over JavaScript ?6:05
TypeScript is a strongly typed superset of JavaScript with object oriented features like classes, interfaces, enums, and generics, and it compiles to JavaScript for browsers, enabling Angular development.
Q7. Where to store static files in Angular project ?0:22
Q8. What is the role of Angular.json file in Angular?0:42
Q9. What is the difference between JIT and AOT in Angular ?3:31

Components & Modules - Introduction0:58
Explore Angular components as the face of the framework, covering component definition, selector, template, and modules, then dive into the Angular architectural flow and bootstrap module and bootstrap component.
Q10. What are Components in Angular?2:48
Q11. What is a Selector and Template?1:24
Q12. What is Module in Angular? What is app.module.ts file?3:03
Explore how Angular groups components, directives, pipes, and services into a module using app.module.ts, the root module, loaded by the NgModule decorator with declarations, imports (including browser module), and bootstrap.
Q13.Angular App gets Loaded&Started?Define index.html,app-root,selector&main.ts?3:59
Q14. What is a Bootstrapped Module & Bootstrapped Component?1:38
Discover how a bootstrap module and bootstrap component start an Angular app by loading index.html and main.ts, then bootstrapping the app module.

Directives - Introduction0:59
Q20. What are Directives? What are the type of directives?2:29
Q21. What is *ngIf Structural directive?1:54
Q22. What is *ngFor Structural directive?1:21
Q23. What is *ngSwitch Structural directive?2:29
Q24. What is [ngStyle] Attribute directive?3:08
Q25. What is [ngClass] Attribute directive?2:41
Q26. Difference between Component, Attribute and Structural Directives?1:44
explain the differences between component, structural, and attribute directives; component shows the first view, structural adds or removes elements, and attribute changes appearance via CSS classes.

Decorator & Pipes - Introduction0:44
Q27. What is Decorator?1:44
Explore how Angular decorators store metadata about a class, including selector, template URL, style URLs, and module metadata such as declarations, imports, providers, and bootstrap, all via the @ symbol.
Q28. What are the types of Decorator?0:51
Q29. What are Pipes? What are the types of Pipes & Parameterized Pipes?2:18
Q30. What is Chaining Pipes?0:50

Services & Dependency Injection - Introduction1:36
Q31. Explain Services with Example?2:01
Discover how Angular services provide reusable code via a TypeScript class injected into components, enabling centralized error logging and shared user data without duplication.
Q32. How to create Servicein Angular?3:18
Q33. How to use Dependency Injector with Services in Angular?1:52
Q34. What is Hierarchical Dependency Injection?2:39
Explore hierarchical dependency injection in Angular, showing how component, module, or route injector providers determine a service’s visibility across parent, child, and sibling components, with providedIn as the app-wide default.
Q35. What is Provider in Angular?1:09
Q36. What is the role of @Injectable Decorator in a Service?4:06

Decorators & Lifecycle - Hooks - Introduction1:09
Q37. What are Parent-Child Components?3:28
Q38.Define@Input Decorator ?How to transfer data from Parent to Child component?5:09
Q39. What is @Output Decorator and Event Emitter?6:18
Q40. What are Lifecycle Hooks in Angular?3:25
Q41. What is a Constructor in Angular?2:18
Q42. What is ngOnChanges life cycle hook in Angular?4:11
Q43. What is ngOnInit life cycle hook in Angular?1:26
Q44. What is the difference between constructor and ngOnInit ?4:30

Routing - Introduction0:55
Explore routing in Angular by examining router outlet and router links, and learn how the URL drives your app; also enable auto import in VS Code to streamline imports.
Q45. What is Routing? How to setup Routing?5:20
Q46. What is router outlet?1:17
Q47. What are router links ?0:44
Learn that router link in Angular navigates to a different route or displays a different component, a key interview concept for Angular routing.

Observable \ HttpClient \ RxJS - Introduction0:54
Q48. What are Asynchronous operations?2:20
Explore asynchronous operations in JavaScript and TypeScript, contrasting synchronous, single-threaded execution with asynchronous patterns using promises and observables, and see why observables matter in Angular.
Q49. What is the difference between Promise and Observable?4:27
Compare promise and observable in JavaScript, showing how promises deliver a single data set and how observables stream multiple values lazily, with cancellable subscriptions and unsubscribe options.
Q50. What is RxJS?2:33
Q51. What is Observable? How to implement Observable ?4:48
Q52. What is the role of HttpClient in Angular?1:16
Q53. What are the steps for fetching the data with HttpClient & Observable ?8:46
Q54. How to do HTTP Error Handling in Angular ?5:05

Requirements

Very Basic understanding of HTML and JavaScript required

Description

One Stop Destination For All Interview Questions.

Top 400 Interview Questions and Answers Video Lectures with Revision PDF Books.

1. Top 100 Angular Interview Questions

(Topics from which questions are covered)

Angular Framework
Components & Modules
Data Binding
Directives
Decorator & Pipes
Services & Dependency Injection
Component Lifecycle-Hooks
Routing
Observable\ HttpClient\ RxJS
Typescript-Basics
Typescript - OOPS
Angular Forms
Authentication/ JWT/ Auth Gurad/ HTTP Interceptor
Parent Child Components Communication

2. Top 200 JavaScript Interview Questions

(Topics from which questions are covered)

Basics
Variables and data types
Operators & Conditions
Arrays
Loops
Functions
Strings
DOM
Error Handling
Objects
Events
Closures
Asynchronous programming: basics
Asynchronous Programming: Promises
Asynchronous Programming: Async Await
Browser APIs and Web Storage
Classes, constructors, this, and inheritance
ECMAScript and Modules
Security and Performance
Scenario-based: Tricky Short Questions
Scenario-based feature development questions
JS Coding Questions

3. (BONUS) Top 100 HTML, CSS & Bootstrap Interview Questions

(Topics from which questions are covered)

HTML5 Chapters:

Basics & Document Structure
HTML Elements & Tags – Part I
HTML Elements & Tags – Part II
HTML Attributes, HTML Links & Navigation
HTML Lists & Tables
HTML Images & Multimedia
HTML Forms
Best Practices & Deployment
Responsiveness & Others

CSS Chapters:

Basics & Implementation
Selectors in CSS
Layout and Positioning
Responsive Design.

Bootstrap Chapters:

Bootstrap

Revision PDF Boos: All notes are present in PDF and PPT format in resources of the course.

Interview Preparation Tracker Sheet: All questions listed in this tracker excel. Just have a look just before the interviews.

About Instructor: The instructor has more than 15 years of experience in full-stack development and has given and taken more than 100 interviews in his career.

All the best for your interview preparation.

Who this course is for:

Candidate looking for Angular Jobs
Candidate looking for FrontEnd jobs in software industry with Angular, JavaScript, HTML, CSS, Bootstrap skills

Angular & JavaScript Interview: Top 400 Questions (2026)

What you'll learn

Explore related topics

Course content

Course Introduction and Structure1 lecture • 2min

Angular Framework10 lectures • 23min

Components & Modules6 lectures • 14min

Data Binding6 lectures • 15min

Directives8 lectures • 17min

Decorator & Pipes5 lectures • 6min

Services & Dependency Injection7 lectures • 17min

Decorators & Lifecycle - Hooks9 lectures • 32min

Routing4 lectures • 8min

Observable \ HttpClient \ RxJS8 lectures • 30min

Requirements

Description

Who this course is for: