Top Node JS Interview Questions 🔥 NodeJS tutorial for beginners

Welcome to this NodeJS tutorial for beginners! In this tutorial, we will cover some basic NodeJS interview questions to help you prepare for your next interview. NodeJS is a popular JavaScript runtime that allows developers to build scalable and fast server-side applications.

Before we dive into the interview questions, let’s first cover some basic concepts about NodeJS. NodeJS is built on Chrome’s V8 JavaScript engine and uses an event-driven, non-blocking I/O model that makes it lightweight and efficient. It allows developers to write JavaScript code outside of the browser, making it possible to create server-side applications with JavaScript.

Now, let’s move on to some common NodeJS interview questions:

1. What is NodeJS?
NodeJS is a server-side platform built on Chrome’s V8 JavaScript engine. It allows developers to run JavaScript code outside of the browser, making it possible to build server-side applications using JavaScript.

2. What is NPM?
NPM (Node Package Manager) is a package manager that comes with NodeJS. It allows developers to easily install, manage, and share packages of code with other developers. It is the largest ecosystem of open source libraries in the world and is widely used in the NodeJS community.

3. What are the advantages of using NodeJS?
Some of the advantages of using NodeJS include its event-driven architecture, non-blocking I/O model, lightweight and scalable nature, and a large ecosystem of open source libraries. It allows developers to build fast and scalable server-side applications using JavaScript.

4. What is a callback function in NodeJS?
A callback function is a function that is passed as an argument to another function and is executed once the first function has completed its operation. In NodeJS, callback functions are commonly used to handle asynchronous operations such as reading a file or making an HTTP request.

5. How do you handle errors in NodeJS?
In NodeJS, errors can be handled using try-catch blocks to catch synchronous errors and using the callback function to handle asynchronous errors. NodeJS also provides the ‘error’ event that can be used to handle errors in streams and other asynchronous operations.

6. What is the difference between process.nextTick() and setImmediate() in NodeJS?
process.nextTick() is used to schedule a callback function to be executed in the next iteration of the event loop, before any I/O events. setImmediate() is used to schedule a callback function to be executed after any I/O events in the current event loop iteration.

I hope this tutorial helps you in preparing for your NodeJS interview. Good luck!