nodejs interview questions

15 Must-Know Node.js Interview Questions for Freshers

June 20, 2024

The fundamental knowledge of any software or machine language is the key to success in the IT field. The same goes with Node.js. If you wish to crack the dream job interview, you need a detailed Node.js course. But what happens after a course? You need to prepare for some frequently asked interview questions.

If you’re wondering where to find help, we can certainly assist you with this!

Top 15 Most Asked Node.js Interview Questions for Freshers

1. What are the Benefits of using Node.js?

Node.js is really quick because it handles multiple tasks at once without waiting for each one to finish before starting the next. It uses JavaScript, which is handy because if you know how to make things look good on the front of a website (like buttons and menus), you can also make them work on the back end (like connecting to a database). Plus, there’s a big group of Node.js users who always make new tools and add-ons, which makes it even better to use.

2. What are the Disadvantages of Node.js?

Node.js has a few drawbacks, including its single-threaded nature which might not be suitable for CPU-intensive tasks. Node.js has a younger ecosystem when you compare it to other tech out there. This means it may not adapt with other systems. This can cause some problems with its stability and flexibility to work around other tech. Also, because Node.js doesn’t really support older tech, it can be tough for companies to keep their current apps up and running without some extra work.

3. Is Node.js Cross-Platform?

Yes, Node.js is cross-platform. This is one of the most frequently asked node interview questions.It is like a free tool that lets you run websites outside of your web browser, like on your computer or a server. It’s made for building websites that need to work on the server side (where websites do their heavy lifting). That’s why it can run on various operating systems like Windows, Linux, and macOS.

4. What Can We Build with Node.js?

With Node.js, you can build a variety of applications. It can include web servers, real-time chat applications, REST APIs, e-commerce platforms, and collaborative tools. Developing scalable network applications is easy with its versatility and performance. Node.js is also a great choice for developing mobile applications because it is lightweight and highly responsive. It is widely used to build serverless applications, as well.

5. What is Event Loop and How Does It Work?

This is one of those node js basic questions. The event loop deals with tasks that don’t happen right away using a loop that runs one thing at a time. When a task is done, the event loop takes the callback function and runs it. This lets Node.js do many things at once, like reading files or getting data from the internet, without getting stuck. The event loop also chooses what tasks to do and when to do them. This keeps the app quick and able to deal with many people asking for different things simultaneously.

6. What are REPL and Its Uses?

REPL, short for Read-Eval-Print Loop, is like a chat room for Node.js where you can type commands and get immediate answers. It’s a place where developers go to fix problems, try out bits of code, or play around with new ideas. You can type in code and see what happens right away, which is great for learning and building things. REPL is also good for making a rough version of a program quickly.

7. Explain Node.js Web Application Architecture

Node.js web apps usually have a three-part structure: the presentation layer (what users see), the application layer (the app’s brain), and the data layer (where information is stored). This setup makes it easier to handle different parts of the app separately, which means the code is easier to manage and the app can grow more easily.

8. What is the Difference Between JavaScript and Node.js?

JavaScript is a programming language that’s mostly used to make websites interactive for the user. Node.js is different; it’s a place where you can run JavaScript on the server, not just in the browser. This means you can use JavaScript to handle everything in an app, from showing things to the user to storing data. Node.js is liked by a lot of programmers, which makes it a go-to option for creating websites. It is also free and open source, making it accessible to a wide range of users.

9. What is the Difference Between Synchronous and Asynchronous Functions?

Synchronous functions block the execution until they finish processing. Whereas, asynchronous functions allow the program to continue executing other tasks while waiting for the previous ones to complete. This makes asynchronous functions more efficient in non-blocking environments like Node.js.

10. Why is Node.js Single-Threaded?

Node.js uses a single-threaded approach which makes it easier to build apps that do many things at once without waiting for each task to finish. This setup means it can deal with lots of users or tasks at the same time without getting tangled up in handling many threads, which is great for tasks that involve a lot of input/output like reading files or getting data from the internet. Plus, because it’s designed to work this way, it can grow well when more and more people use the app.

11. What are Some Commonly Used Timing Features in Node.js?

Node.js provides several timing features such as setTimeout, setInterval, and setImmediate. These functions allow you to schedule code execution after a specified delay, repeatedly execute code at regular intervals, or execute code immediately after the current event loop cycle, respectively.

12. What is Fork in Node.js?

Now, this is one of the most-asked node js coding interview questions. Forking in Node.js creates a new instance of the V8 engine to run multiple processes. Multi-core systems benefit from this since it allows for the spawning of child processes to handle simultaneous operations.

13. How Many Types of API Functions are There in Node.js?

Node.js has two main types of API functions: asynchronous, non-blocking functions and synchronous, blocking functions. Asynchronous functions are preferred for I/O operations to ensure the application remains responsive. Synchronous functions are good for calculations and logic operations. Node.js also provides an event-driven API for event-driven applications.

14. How Does Node.js Handle Multi-Processor Platforms, and Does It Maximize Processor Resource Usage?

This is one of the commonly asked node js coding questions and answers that you should prepare for. Node.js can work with computers that have more than one processor. It does this by creating several smaller processes or using worker threads. This spreads out the work so that the processors are used to their full potential, which makes tasks that need a lot of computing power run better.

15. Explain the Purpose of Module.exports

Last, but not least of the important node js interview questions. Module.exports is used to expose functions, objects, or primitives from a Node.js module. It allows other files to import and use the exported functionalities, facilitating code reuse and modularity in Node.js applications.


So, there you have the most asked node js basic interview questions for freshers. Getting ready for a Node.js interview means you need to get the basics and the tricky parts down. A class on Node.js can teach you what you need to know and let you try things out for real.

We think these Node.js coding questions and answers will give you a heads-up on the kind of stuff they might ask you. If you study these questions, you could nail your interview on the first try.

If you want to really dig deep and get good at Node.js, which is getting more and more popular for making web apps, sign up for one of our courses. Start learning now, and you’ll be on your way to a great career in making Node.js apps.

If you need help with choosing the top node.js courses, browse through our website or call us today!