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Angular & JavaScript Interview

Top 400 Questions (2025)

Happy Rawat

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)

Read more

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)

  1. Angular Framework

  2. Components & Modules

  3. Data Binding

  4. Directives

  5. Decorator & Pipes

  6. Services & Dependency Injection

  7. Component Lifecycle-Hooks

  8. Routing

  9. Observable\ HttpClient\ RxJS

  10. Typescript-Basics

  11. Typescript - OOPS

  12. Angular Forms

  13. Authentication/ JWT/ Auth Gurad/ HTTP Interceptor

  14. Parent Child Components Communication

2. Top 200 JavaScript Interview Questions

   (Topics from which  questions are covered)

  1. Basics

  2. Variables and data types

  3. Operators & Conditions

  4. Arrays

  5. Loops

  6. Functions

  7. Strings

  8. DOM

  9. Error Handling

  10. Objects

  11. Events

  12. Closures

  13. Asynchronous programming: basics

  14. Asynchronous Programming: Promises

  15. Asynchronous Programming: Async Await

  16. Browser APIs and Web Storage

  17. Classes, constructors, this, and inheritance

  18. ECMAScript and Modules

  19. Security and Performance

  20. Scenario-based: Tricky Short Questions

  21. Scenario-based feature development questions

  22. JS Coding Questions

3. (BONUS) Top

  • Bootstrap  Chapters:

  1. 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.

Enroll now

What's inside

Learning objectives

  • 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

Syllabus

Course Introduction and Structure
Course Structure (PDF books attached in resources)
Angular Framework
Angular Framework - Introduction
Read more
Q1. What is Angular?
Q2. What are Angular advantages?
Q3. What is the difference between AngularJS and Angular?
Q4. What is NPM ?
Q5. What is CLI tool ?
Q6. What is Typescript? What are the advantages of Typescript over JavaScript ?
Q7. Where to store static files in Angular project ?
Q8. What is the role of Angular.json file in Angular?
Q9. What is the difference between JIT and AOT in Angular ?
Components & Modules
Components & Modules - Introduction
Q10. What are Components in Angular?
Q11. What is a Selector and Template?
Q12. What is Module in Angular? What is app.module.ts file?
Q13.Angular App gets Loaded&Started?Define index.html,app-root,selector&main.ts?
Q14. What is a Bootstrapped Module & Bootstrapped Component?
Data Binding
Data Binding - Introduction
Q15. What is Data Binding in Angular?
Q16. What is String Interpolation in Angular?
Q17. What is Property Binding in Angular?
Q18. What is Event Binding in Angular?
Q19. What is Two way Binding in Angular?
Directives
Directives - Introduction
Q20. What are Directives? What are the type of directives?
Q21. What is *ngIf Structural directive?
Q22. What is *ngFor Structural directive?
Q23. What is *ngSwitch Structural directive?
Q24. What is [ngStyle] Attribute directive?
Q25. What is [ngClass] Attribute directive?
Q26. Difference between Component, Attribute and Structural Directives?
Decorator & Pipes
Decorator & Pipes - Introduction
Q27. What is Decorator?
Q28. What are the types of Decorator?
Q29. What are Pipes? What are the types of Pipes & Parameterized Pipes?
Q30. What is Chaining Pipes?
Services & Dependency Injection
Services & Dependency Injection - Introduction
Q31. Explain Services with Example?
Q32. How to create Servicein Angular?
Q33. How to use Dependency Injector with Services in Angular?
Q34. What is Hierarchical Dependency Injection?
Q35. What is Provider in Angular?
Q36. What is the role of @Injectable Decorator in a Service?
Decorators & Lifecycle - Hooks
Decorators & Lifecycle - Hooks - Introduction
Q37. What are Parent-Child Components?
Q38.Define@Input Decorator ?How to transfer data from Parent to Child component?
Q39. What is @Output Decorator and Event Emitter?
Q40. What are Lifecycle Hooks in Angular?
Q41. What is a Constructor in Angular?
Q42. What is ngOnChanges life cycle hook in Angular?
Q43. What is ngOnInit life cycle hook in Angular?
Q44. What is the difference between constructor and ngOnInit ?
Routing
Routing - Introduction
Q45. What is Routing? How to setup Routing?
Q46. What is router outlet?
Q47. What are router links ?
Observable \ HttpClient \ RxJS
Observable \ HttpClient \ RxJS - Introduction
Q48. What are Asynchronous operations?
Q49. What is the difference between Promise and Observable?
Q50. What is RxJS?
Q51. What is Observable? How to implement Observable ?
Q52. What is the role of HttpClient in Angular?
Q53. What are the steps for fetching the data with HttpClient & Observable ?
Q54. How to do HTTP Error Handling in Angular ?
Typescript-Basics
Typescript-Basics - Introduction
Q55. What is Typescript ? Difference between Typescript and Javascript ?
Q56. How to install Typescript and check version ?
Q57. What is the difference between let and var keyword ?
Q58. What is Type annotation ?
Q59.What are Built in/Primitive & UserDefined/Non-primitive types in Typescript?
Q61. What is Enum type in Typescript ?
Q62. What is the difference between void and never types in Typescript ?
Q63. What is Type Assertion in Typescript ?
Q64. What are Arrow Functions in Typescript ?
Typescript - OOPS
Typescript - OOPS - Introduction
Q65. What is Object Oriented Programming in Typescript ?
Q66. What are Classes and Objects in Typescript ?
Q67. What is Constructor ?
Q68. What are Access Modifiers in Typescript ?
Q69. What is Encapsulation in Typescript?
Q70. What is Inheritance in Typescript ?
Q71. What is Polymorphism in Typescript ?
Q72. What is Interface in Typescript ?
Q73. What's the difference between extends and implements in TypeScript?
Q74. Is Multiple Inheritance possible in Typescript ?
Angular Forms
Angular Forms - Introduction
Q75. What are Angular Forms? What are the type of Angular Forms?

Good to know

Know what's good
, what to watch for
, and possible dealbreakers
Covers Angular, JavaScript, HTML, CSS, and Bootstrap, which are essential technologies for front-end development roles
Includes a preparation tracker sheet, which can help learners organize their study and revision before interviews
Features video lectures with revision PDF books, which caters to different learning styles and preferences
Focuses on interview questions, which may not provide a deep understanding of the underlying concepts
Includes questions about Bootstrap, which may be less relevant for roles that use other CSS frameworks
Focuses on Angular, which is a specific framework, so learners should consider if it aligns with their career goals

Save this course

Save Angular & JavaScript Interview: Top 400 Questions (2025) to your list so you can find it easily later:
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Activities

Be better prepared before your course. Deepen your understanding during and after it. Supplement your coursework and achieve mastery of the topics covered in Angular & JavaScript Interview: Top 400 Questions (2025) with these activities:
Review JavaScript Fundamentals
Solidify your understanding of JavaScript fundamentals to better grasp Angular concepts and coding interview questions.
Show steps
  • Review variables, data types, operators, and control flow in JavaScript.
  • Practice writing basic JavaScript functions and DOM manipulation.
  • Work through online JavaScript tutorials and exercises.
Brush Up on TypeScript
Strengthen your TypeScript knowledge to prepare for Angular interview questions related to TypeScript features and syntax.
Browse courses on TypeScript
Show steps
  • Review TypeScript syntax, types, and interfaces.
  • Practice writing TypeScript classes and modules.
  • Convert existing JavaScript code to TypeScript.
Read 'Effective TypeScript'
Gain a deeper understanding of TypeScript best practices to improve your Angular development skills and interview performance.
View Effective Typescript on Amazon
Show steps
  • Read and take notes on each item in 'Effective TypeScript'.
  • Apply the book's recommendations to your existing TypeScript projects.
  • Discuss the book's concepts with other developers.
Five other activities
Expand to see all activities and additional details
Show all eight activities
Practice Angular Coding Challenges
Sharpen your Angular coding skills by solving common interview coding challenges related to components, services, and data binding.
Show steps
  • Find Angular coding challenges on platforms like HackerRank or LeetCode.
  • Solve at least three coding challenges per week.
  • Review your solutions and identify areas for improvement.
Mock Interview with Peers
Simulate real interview scenarios by conducting mock interviews with peers, focusing on Angular and JavaScript questions.
Show steps
  • Find a peer who is also preparing for Angular interviews.
  • Take turns asking each other interview questions.
  • Provide constructive feedback on each other's answers.
Create a Personal Interview Question Bank
Compile a personalized list of Angular and JavaScript interview questions and answers to reinforce your understanding and prepare for interviews.
Show steps
  • Review the course materials and identify key interview questions.
  • Research and write detailed answers to each question.
  • Organize your question bank for easy access and review.
Read 'You Don't Know JS Yet'
Deepen your understanding of JavaScript internals to confidently answer challenging interview questions and write more efficient Angular code.
View You Don't Know JS Yet: Get Started on Amazon
Show steps
  • Read and understand the 'You Don't Know JS Yet' series.
  • Experiment with the concepts in a JavaScript environment.
  • Relate the concepts to Angular development practices.
Build a Portfolio Project with Angular
Create a showcase-worthy Angular project to demonstrate your skills and impress potential employers during interviews.
Show steps
  • Choose a project idea that aligns with your interests and skills.
  • Design and develop the project using Angular best practices.
  • Deploy the project to a public platform like GitHub Pages or Netlify.

Career center

Learners who complete Angular & JavaScript Interview: Top 400 Questions (2025) will develop knowledge and skills that may be useful to these careers:
Frontend Developer
A frontend developer builds the user interface of websites and applications, and this course directly helps with many of the skills needed. The course covers key frontend technologies such as Angular and JavaScript, delving deeply into topics like components, data binding, and routing. This course is particularly useful because it provides practice questions and answers in these areas, which helps build a foundation, particularly for interviews. The course also includes JavaScript interview questions which strengthens a developer's understanding of the language. The course helps one prepare for technical interviews and also provides a practical grasp of core frontend technologies, beneficial for daily work as a frontend developer.
See salaries and explore the career path for Frontend Developer
JavaScript Developer
A JavaScript developer specializes in writing code using JavaScript, and this course is well suited for this role. The course includes in-depth coverage of JavaScript, including basics, variables, data types, operators, and asynchronous programming. It also explores more advanced topics like classes, closures, and ECMAScript. This helps Javascript developers prepare for technical interviews with its focus on practical interview questions and answers. This course helps Javascript developers refine knowledge and improve their coding skills in JavaScript, essential for daily development tasks.
See salaries and explore the career path for JavaScript Developer
Web Developer
Web developers create websites and web applications, and this course is a great fit for those focused on the frontend. This course provides extensive coverage on Angular and JavaScript, which are vital tools in web development. The course specifically addresses areas like components, directives, data binding, and routing, all of which are core to building dynamic web interfaces. The course helps web developers prepare for job interviews with a focus on typical questions. The course also covers crucial aspects of JavaScript, including asynchronous programming and DOM manipulation and helps a web developer be better prepared for real-world projects.
See salaries and explore the career path for Web Developer
Software Development Engineer
Software development engineers are involved in the entire software development lifecycle, and this course provides specialized training for those focused on frontend web development. This course includes detailed content on Angular and JavaScript, covering a range of topics from basic syntax to advanced concepts. The course provides focused interview preparation on Angular and JavaScript. A software development engineer can benefit from this course by strengthening their expertise in these technologies. The course may be helpful in understanding and addressing technical interview questions as well as providing a foundation for building web applications.
See salaries and explore the career path for Software Development Engineer
Full-Stack Developer
Full stack developers work on both the frontend and backend of applications, and this course may be helpful to those focused on the frontend part. The course provides a comprehensive understanding of Angular and JavaScript, which are essential frontend technologies. The course may be useful because it covers a range of topics including components, modules, and data binding. It also provides exposure to more advanced topics such as asynchronous programming, and routing. A Full stack developer may appreciate the course which provides helpful material for technical interviews. This course may help a full stack developer deepen their knowledge of frontend development.
See salaries and explore the career path for Full-Stack Developer
Software Engineer
Software engineers design and develop software applications, and this course may be useful for those specializing in frontend development. The course provides a deep dive into Angular and JavaScript, covering essential aspects like components, modules, data binding, and asynchronous programming. These topics are fundamental to frontend engineering. The course's interview-focused approach can help software engineers prepare for technical interviews, and the thorough coverage of Angular and JavaScript can improve daily coding abilities. The course also touches on TypeScript, a language often used in modern software engineering, and that helps build a foundation in its principles.
See salaries and explore the career path for Software Engineer
UI Engineer
A user interface engineer specializes in building and implementing user interfaces. This course may be particularly relevant because it offers comprehensive training in Angular and JavaScript. Both are crucial technologies for UI development. The course covers components, data binding, and other relevant areas , and also touches on topics such as routing and state management. This course may be useful for UI engineers as it provides insight into technical interview questions, and helps reinforce a strong understanding of these technologies. The course provides hands-on, interview-style preparation that directly aligns with the needs of a UI engineer.
See salaries and explore the career path for UI Engineer
Application Developer
An application developer builds software applications, and the course can be especially useful for those working on web-based applications. This course provides a thorough understanding of Angular and JavaScript, both of which are essential for creating dynamic interfaces. The course covers various aspects such as components, modules, data binding, and asynchronous programming, which are all critical for application development. The course may be helpful because it includes practice questions and answers, as well as coverage of Typescript for building a foundation for application development. This course may be useful for an application developer seeking a better understanding of frontend technologies.
See salaries and explore the career path for Application Developer
Front End Architect
A front end architect designs and oversees the development of user interfaces, and this course may be useful for those who want to strengthen their expertise. The course gives a thorough overview of Angular and JavaScript, covering areas such as components, directives, data binding, and routing. The course's interview-focused approach can help a front end architect re-enforce their foundation. The detail in Angular and JavaScript may also help architects in making better decisions about their teams' technology stack. This course may equip a front end architect with further understanding of core frontend development concepts.
See salaries and explore the career path for Front End Architect
Technical Trainer
A technical trainer teaches technology to others, and this course may be helpful to those focusing on web development. The course provides a comprehensive look into Angular and JavaScript with a large collection of practice questions and answers. This may give future trainers the knowledge they need to teach the material. The course also includes detailed information on many topics like components, modules, and data binding, which helps facilitate better teaching and training. This course may help a technical trainer develop a strong foundation to teach these technologies.
See salaries and explore the career path for Technical Trainer
Technology Consultant
Technology consultants advise clients on technology solutions, and this course may be useful for those specializing in web technologies. This course helps build a strong understanding of frontend technologies like Angular and JavaScript. The course gives insight into the technologies and also provides detailed interview questions for candidates to practice with. This may be useful to a Consultant because it allows for a deeper understanding of these tools. The course also covers important topics like routing and services which aids in designing a technology solution. This course may equip a technology consultant with the necessary skills to effectively advise clients on frontend development projects.
See salaries and explore the career path for Technology Consultant
Mobile Application Developer
Mobile application developers create applications for mobile devices, and this course may be useful for those using web technologies to build mobile apps. While the course focuses primarily on Angular and JavaScript, these technologies are often used in hybrid mobile app development. The course provides in-depth coverage of essential concepts, including components, modules, and data binding. This course may be helpful for mobile application developers by helping them to understand the workings and nuances of these technologies. The course also goes into depth on aspects of asynchronous programming. This course may be helpful and it is beneficial for mobile developers learning or implementing hybrid technologies.
See salaries and explore the career path for Mobile Application Developer
Product Manager
Product managers oversee the development and strategy of products, and this course may be useful for those working with web development teams. The course helps build the product manager's understanding of important frontend technologies like Angular and JavaScript. This course may help product managers who are working with development teams, by strengthening their understanding of the technologies. It may also be helpful to understand the technical capabilities and limitations of these tools. This course may equip a product manager with the knowledge to effectively guide product development efforts.
See salaries and explore the career path for Product Manager
Technical Writer
A technical writer creates documentation for software and technology, and this course may be useful for those specializing in web development. The course offers a comprehensive look at many aspects of Angular and JavaScript. The course gives technical writers a deeper understanding of these technologies. The course's focus on interview questions helps equip a technical writer to better understand the user or developer perspective. This course may be useful to a technical writer who wants to better understand the technologies they document.
See salaries and explore the career path for Technical Writer
Quality Assurance Engineer
Quality assurance engineers are responsible for testing software to ensure it meets quality standards, and this course may be useful for those working on web applications. The course's detailed coverage of Angular and JavaScript helps a Quality assurance engineer understand the underlying technologies. The course may be helpful because it provides material to test against. Quality assurance engineers will gain an understanding of the technologies and may more effectively test software. This course may be useful to a quality assurance engineer by helping them better test the technologies used in web applications.
See salaries and explore the career path for Quality Assurance Engineer

Reading list

We've selected two books that we think will supplement your learning. Use these to develop background knowledge, enrich your coursework, and gain a deeper understanding of the topics covered in Angular & JavaScript Interview: Top 400 Questions (2025).
Cover image
You Don't Know JS Yet
Save
Series dives deep into the core mechanisms of JavaScript. It is useful for understanding the underlying principles of the language, which can help you answer more complex interview questions. While not strictly Angular-focused, a strong JavaScript foundation is essential for Angular development. This book provides additional reading to expand on the JavaScript knowledge required for the course.
You Don't Know JS Yet: Get Started
Paperback
$$
You Don't Know JS Yet: Scope & Closures
Paperback
$$
You Don't Know JS Yet: Get Started
Kindle Edition
$$
You Don't Know JS Yet: Scope & Closures
Kindle Edition
$$
Cover image
Effective Typescript
Save
Provides practical advice on writing high-quality TypeScript code. It covers common pitfalls and best practices, helping you avoid errors and write more maintainable code. It is especially useful for understanding the nuances of TypeScript and applying them effectively in Angular projects. This book adds depth to the TypeScript knowledge required for the course.
Effective Typescript
Paperback
Check
Effective Typescript
Kindle Edition
Check

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Effort
15 total hours
Via
Udemy
Instructor
Happy Rawat
Language
English
Good to know
Covers Angular, JavaScript, HTML, CSS, and Bootstrap, which are essential technologies for front-end development roles
Includes a preparation tracker sheet, which can help learners organize their study and revision before interviews
Features video lectures with revision PDF books, which caters to different learning styles and preferences
Focuses on interview questions, which may not provide a deep understanding of the underlying concepts
Includes questions about Bootstrap, which may be less relevant for roles that use other CSS frameworks
Focuses on Angular, which is a specific framework, so learners should consider if it aligns with their career goals
Share and help others discover this course.
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