If you're looking for Node.JS Interview Questions for Experienced or Beginners, you are at the right place. There are a lot of opportunities from many reputed companies in the world. According to research, Node.JS has a market share of about 2.6%. So, You still have the opportunity to move ahead in your career in Node.JS Development. Mindmajix offers Advanced Node JS Interview Questions 2021 or node js programming interview questions that help you in cracking your interview & acquire a dream career as Node.JS Developer.
|Types of Node.JS Interview Questions|
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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.
Node.js shows compatibility with three types of language
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.
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.
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.
Arithmetic operations ( addition, subtraction, multiplication, division), exponentials, increment, and decrement are various common modulus in js.
Modulus is operated by two main managing modules
The Require module
The module module
Both of them are available on a global scope.
The module. exports is a default application that can be found in every js file of Node js.
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.
|Feature||Node JS||Ruby On Rails|
|Operating System||Solaris, OpenBSD, FreeBSD, Linux, Mac, MS, webOS and nonstops||Cross-Platform|
|Type||Event-driven networking||Web application framework|
|Popularity||Popular for its features||Yet to be popular|
|Documentation||Available||Lack of documentation|
|Complexity||Easy to implement||Complex implementation|
The event can be explained as activities carried out. For example, when you open a file it is an event when you close a file it is an event.
In Node js, there is a defaulted module named "Events" with which you can carry various activities like create, fire, listen, etc.
Non-blocking operations in Node Js are carried out with the help of the event loop.
Certain steps are needed to be carried out for this operation:
Import the module which is required.
Create the server using HTTP.createServer().
Test the request and wait for a response
Upstart is a process management system with which you can stop the master process. Generally when the master process is stopped or killed the child process still continues to work.
The emitter is one that makes communication between two nodes.
When the job of the scheduler is completed in a program then dispatched comes into the frame and takes the task to the desired status.
The node js is single-threaded but the node name itself suggests that it is a topology, which means there is communication between two nodes. This communication between the two nodes makes use of all CPUs.
Syntax : $ npm install
$ npm install express
var express = (‘express’);
Where express is the Name of the module,
express is a JS file, that can be used in your module.
Express, connect, socket.io and SockeJS, pug, MongoDB and Mongojs, Redis, Lodash, forever, bluebird, moment are some of the npm modules.
$ npm ls
Note: Remember not to mention npm in UPPERCASE - (Recommended)
Name, version, description, homepage, author, contributors, dependencies − list of dependencies, repository − repository type and URL of the package, the main − entry point of the package, keywords.
REPL - Read, Eval, Print, Loop.
It is an environment for input commands to perform REPL tasks. Each of the tasks is associated with its respective operations.
DIRT, JSON, I/O Bound, Single Page applications are preferable to use Node.JS.
Node v16.3.0 is the current version.
False. It is runtime or environment, but not a framework.
Var fs = require(‘fs’); Read: fs.readFile(); Create: fs.appendFile(); fs.open(); fs.writeFile(); Write: fs. writeFile(); Delete: fs.unlink(); Rename: fs.rename(); Update: fs.appendFile() fs.writeFile()
In order to check for the proper working of the code, we need to verify error-free execution. In this regard, error-first callbacks are used, which will send error first, followed by related data to the error.
Cluster is a process to handle thread execution load while working with multi-core systems.
In order to upgrade the performance well, single thread operations work better than multi-threaded operations.
This module helps URL to parse it into host, pathname, search, query, etc.
var url = require('url'); var adr = 'https://mindmajix.com/?s=node+js+training'; var q = url.parse(adr, true); console.log(q.host); //returns 'mindmajix.com' console.log(q.search); //returns '?s=node+js+training'
It is not included in the default modules list, it has to be installed using npm.
Var nodemailer = require(‘nodemailer’);
Patch_Version, Minor_Version, Major_Version.
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Objects in NodeJS will have to trigger events in order to maintain the asynchronous execution of the core API used. These objects that emit events are known as Event Emitters.
Events that are emitted by event emitters have to listen in order to continue the asynchronous execution of the threads. These objects that listen to the emitted events are known as listeners.
Priyanka Vatsa is a Senior Content writer with more than five years’ worth of experience in writing for Mindmajix on various IT platforms such as Palo Alto Networks, Microsoft Dynamics 365, Siebel, CCNA, Git, and Nodejs. She was involved in projects on these technologies in the past, and now, she regularly produces content on them. Reach out to her via LinkedIn and Twitter.