JavaScript is one of the most important programming languages for web development. If you want to become a Frontend Developer, Full Stack Developer, or Software Developer, you must prepare JavaScript interview questions.
Many companies ask JavaScript questions in interviews for:
- Web Developer
- Frontend Developer
- Full Stack Developer
- MERN Stack Developer
- Software Engineer
This guide includes important JavaScript interview questions for beginners and students preparing for IT jobs.
This article is useful for students searching for:
JavaScript Interview Questions, Web Development Course Jaipur, Full Stack Course Jaipur, Coding Classes Jaipur, Best IT Institute Jaipur.
Basic JavaScript Interview Questions
1. What is JavaScript?
JavaScript is a programming language used to make websites dynamic.
Used for:
- UI interaction
- API calls
- Events
- Animations
- Web applications
2. Difference between var, let, const
| Keyword | Scope | Reassign | Redeclare |
|---|---|---|---|
| var | Function | Yes | Yes |
| let | Block | Yes | No |
| const | Block | No | No |
3. What is DOM?
DOM = Document Object Model
It allows JavaScript to change HTML and CSS.
Example:
- Change text
- Change style
- Handle click
4. What is Event in JavaScript?
Event means user action.
Examples:
- Click
- Hover
- Submit
- Key press
JavaScript handles events.
5. What is Function?
Function is a block of code.
Example:
function add(a,b){
return a+b;
}
Functions are used in every project.
Intermediate JavaScript Questions
6. What is ES6?
ES6 is modern JavaScript.
Features:
- let / const
- Arrow function
- Classes
- Modules
- Promises
7. What is Arrow Function?
const add = (a,b) => a+b;
Short syntax.
8. What is Promise?
Promise handles async work.
Used in API.
States:
- Pending
- Resolved
- Rejected
9. What is Async / Await?
Used for async code.
async function getData(){
await fetch();
}
10. What is Closure?
Closure means function inside function.
Used for data security.
Advanced JavaScript Questions
What is Hoisting
What is Callback
What is Event Loop
What is JSON
What is API
What is Local Storage
What is Session Storage
What is Prototype
What is Class
What is Module
These are asked in Full Stack interviews.
After JavaScript What to Learn?
You should learn:
- React
- Node JS
- MongoDB
- Full Stack
- Projects
JavaScript alone is not enough.
Best JavaScript / Full Stack Course in Jaipur
Groot Academy Jaipur
Groot Academy is a software training institute in Jaipur providing job-oriented JavaScript, Web Development, and Full Stack training.
Courses available:
- JavaScript Course
- Full Stack Web Development
- MERN Stack
- Java Full Stack
- Python Full Stack
- C / C++
- Data Structures
- Internship Training
Why choose Groot Academy
✅ Live project training
✅ Internship certificate
✅ Placement support
✅ Industry mentors
✅ Software company environment
✅ Beginner to advanced training
Website
https://grootacademy.com
Software Company
https://grootsoftware.com
Social Media
LinkedIn
https://www.linkedin.com/company/grootacademy/?originalSubdomain=in
Instagram
https://www.instagram.com/groot.academy/
Facebook
https://www.facebook.com/GrootAcademy
Contact
+91-9610967825
Location
Jaipur Rajasthan
Final Conclusion
JavaScript interview questions are very important for students preparing for Web Development or Full Stack jobs. You should learn basics, ES6, async, API, and projects to crack interviews.
If you are searching for JavaScript Course in Jaipur, you can join Groot Academy Jaipur, where students learn real software development with live projects, internship, and placement support.
