KONE – Node JS Interview Questions

Here is the list of Node JS Interview Questions which are recently asked in KONE company. These questions are included for both Freshers and Experienced professionals. Our Node JS Training has Answered all the below Questions.

1. What Is Node.Js?

Node JS isthe JavaScript free and open source cross-platform for server-side programming that allows users to build network applications quickly. Node.js is used for non-blocking, event-driven servers, due to its single-threaded nature and used for traditional web sites, back-end API services.

2. What Are The Key Features Of Node.Js?

Asynchronous and Event Driven
Very Fast
Single Threaded but Highly Scalable
No Buffering
License

3. What IDEs Can You Use For Node.Js Development?

The IDEs that can be used for Node JS development are Visual Studio Code, Sublime Text, WebStorm, Atom, Cloud9, Eclipse, IntelliJ IDEA, Komodo IDE.

4. Explain How Does Node.Js Work?

Node is event-driven. The server consists of one thread processing one event after another. When a new request coming in is one kind of event, the server starts processing it and when there is a blocking IO operation, it does not wait until it completes and instead registers a callback function.

5. Explain REPL In Node.Js?

A read–eval–print loop (REPL) is a simple interactive computer programming environment that takes single user inputs, executes them, and returns the result to the user and the program is executed as piecewise.

6. Is Node.Js Entirely Based On A Single-Thread?

Node JS follows Single Threaded with Event Loop Model. Its Processing model mainly based on JavaScript Event based model with JavaScript callback mechanism. So it can handle more and more concurrent client requests very easily.

7. How To Get Post Data In Node.Js?

Get HTTP request body data using Node.js

const express = require('express') const app = express() app. use( express. urlencoded({ extended: true }) ) app.
const server = http. createServer((req, res) => { // we can access HTTP headers req.
const server = http. createServer((req, res) => { let data = ''; req.

8. How To Make Post Request In Node.Js?

There are dozens of open-source libraries available that you can use to making an HTTP POST request in Node.

Axios (Recommended) constaxios = require('axios'); const data = { name: 'John Doe', job: 'Content Writer' }; axios.
Needle.
Request.
Native HTTPS Mod

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9. What Is Callback In Node.Js?

A callback is a function which is called when a task is completed, thus helps in preventing any kind of blocking and this function allows other code to run in the meantime. It is called when task get completed and is asynchronous equivalent for a function.

10. How To Avoid Callback Hell In Node.Js?

The four solutions to callback hell are Write comments, Split functions into smaller functions, Using Promises, Using Async/await

11. What Is The Difference Between Nodejs, AJAX, And JQuery?

NodeJs is an open-source framework based on JavaScript v8 engine. AJAX is a web development technique for making asynchronous calls to the server. jQuery is a JavaScript library for designing and make some web development tasks easy. It makes it possible to run javascript outside of the browser.

12. What Are Globals In Node.Js?

Node.js global objects are global in nature and available in all modules.global is a reference to the real global scope object in Node.js. global. studentName = 'Kyle' console.

13. How To Load HTML In Node.Js?

Node.js will now load any existing HTML file in your project on accessing it by its name and extension. const http = require('http'); const fs = require('fs'); const hostname = '127.0. 0.1'; const port = 3000; const server = http. createServer((req, res) => { if(req.

14. What Is EventEmitter In Node.Js?

The EventEmitter is a module that facilitates communication/interaction between objects in Node. EventEmitter is at the core of Node asynchronous event-driven architecture. Many of Node's built-in modules inherit from EventEmitter including prominent frameworks like Express.js.

15. How Many Types Of Streams Are Present In Node.Js?

There are four fundamental stream types in Node. js: Readable, Writable, Duplex, and Transform streams

16. List And Explain The Important REPL Commands?

REPL Command	Description
.save filename	Save current Node REPL session to a file.
.load filename	Load the specified file in the current Node REPL session.
ctrl + c	Terminate the current command.
ctrl + c (twice)	Exit from the REPL.

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TOP MNC's NODE JS INTERVIEW QUESTIONS & ANSWERS

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KONE Node JS Interview Questions