Node.js, the server-side scripting tool, using which one can build everything, starting from a simple command line programs to the complex enterprise level web applications with equal ease. This is why most industries demand a Certified Node.js Developer to manage the entire server side. Node.js, also brings with it, career opportunities at various levels. In case you are planning to attend Node.js interviews in the near future, we are here to help you with a list of Top 50 Node.js interview questions that you must prepare in 2023.
Before I start off with this Node js Interview Questions article, let me put forth a request to the readers who might have attended Node.js interviews in recent past. So, if you have come across such questions which were asked in interviews but are missing in this article, feel free to put those questions in the comment section below. We will try and answer those at the earliest so that others can also benefit from it.
Now, let’s get started.
1) What is NodeJS?
Node.js can be simply explained as it is a concept of two outcomes: runtime environment and JavaScript library. So basically, node.js will enable you to use javascript beyond the browser. It can make Javascript like 'go anywhere Javascript'.
2) What is NPM?
Javascript operates in a runtime environment with the help of node js having its own package manager, this package manager is called NPM.
3) What is CLI in Node.js?
One of the vital reasons for Node.js getting popular is its 900000 packages connected to a large ecosystem. CLI is a command-line interface that will allow you to automate your tasks by taking advantage of this vast ecosystem. Not only that, by writing CLI you can differentiate your proposed packages among the ecosystem.
4) In which Language Node Js is written?
Node.js shows compatibility with three types of language
- C
- C++
- Javascript
5) Who is the author of Node Js?
Ryan Dahl is the author of Node.js it was almost 13 years back when the javascript environment was introduced to the world. Initially, Node is was supported by Linux and Mac OS X but later it was sponsored by Joyent.
6) What is a Javascript Engine?
Javascript engine is used to run the java code in the browser so you can define a javascript engine as a computer program that is used to perform the java code. Initially, it was just used for interpretation and progressively it improved and got evolved. Generally, all browsers have one dealer and he is the one who develops the javascript engine.
7) What is a V8 Engine?
In 2008 when google chrome was launched time chrome also introduced its project of the V8 engine. It is an open-source network that can be written in the c++ language.
8) What is ECMAScript?
Ecmascript first appeared in 1997, which was specified and developed by Esma internationals. Evmascriot is also a programming language, which developed various other scripts like Jscript, ActionScript, and the most popularly used javascript.
9) How can you check the installed version of Node Js?
For that, you need to install NPM which is a package manager. The second thing you will need is to have a node in your computer, you can check installed NPM and node by just typing simple commands. Now carry the following steps
Open the windows command prompt
Open command-line tool line Babun, Powershell, ConEmu, etc.
Type node-v which will display your current version of Node Js.
10) What are Modules in Node Js?
Modulus is various commands used in node js to perform tasks like addition, subtraction, division, multiplication, etc. Ins short you can do maths in js using modulus.
11) What are the common Modules?
Arithmetic operations ( addition, subtraction, multiplication, division), exponentials, increment, and decrement are various common modulus in js.
12) What require() is used in Node Js?
Modulus is operated by two main managing modules
The Require module
The module module
Both of them are available on a global scope.
13) What the module. exports in Node Js?
The module. exports is a default application that can be found in every js file of Node js.
14) Is Node Js Single-threaded?
Node Js is single-threaded but it is non-blocking as well, it means that while operating node js various functions like callbacks is carried out in the background which is carried out using different threads or multiple threads.
I believe that these Node.js interview questions would help you understand what kind of questions may be asked to you in an interview, and by going through these Node.js interview questions, you can prepare and crack your next interview in one go. For more in-depth interview questions on node js which can prepare you even more for any upcoming interviews.
Best of luck with your upcoming job interview!
Thanks for Reading !! Keep Learning !!
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