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Node.JS Interview Questions & Answers - Learning Mode
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Node.JS Interview Questions & Answers - Learning Mode

In software development, Node.js is an open-source, cross-platform runtime environment for developing server-side Web applications. Although Node.js is not a JavaScript framework, many of its basic modules are written in JavaScript, and developers can write new modules in JavaScript. The runtime environment interprets JavaScript using Google's V8 JavaScript engine.

Try Node.JS Interview Questions & Answers - Exam Mode

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Node.JS Interview Questions & Answers - Learning Mode
Try Node.JS Interview Questions & Answers - Exam Mode
Question: What is meant by a schema? Is it a set of rules which is copied and renamed, but never worked on that?

Answer: Below are the useful properties of process ?
Platform
Stdin
Stdout
Stderr
execPath
mainModule
execArgv
config
arch
title
version
argv
env
exitCode Source: CoolInterview.com
Question: Explain Stub?

Answer: Stub is a small program, which substitutes for a longer program, possibly to be loaded later and that is located remotely. Stubs are functions/programs that simulate the behaviors of components/modules. Source: CoolInterview.com
Question: What are ?Streams? in Node.JS?

Answer: ?Streams? are objects which will let you read the data from source and write data to destination as a continuous process. Source: CoolInterview.com
Question: Can CRM and ITS server maintained in one system?

Answer: NodeJS is not appropriate to use in scenarios where single-threaded calculations are going to be the holdup. Source: CoolInterview.com
Question: Why to use exec method for Child process module?

Answer: ?exec? method runs a command in a shell and buffers the output. Below is the command ?
child_process.exec(command[, options], callback) Source: CoolInterview.com
Question: When both labor, Machine categories exist how does process time is calculated in WC?

Answer: NPM stands for Node Package Manager (npm) and there are two functionalities which NPM takes care of mainly and they are ?

Online repositories for node.js modules or packages, which can be searched on search.nodejs.org
Dependency Management, Version Management and command line utility for installing Node.js packages. Source: CoolInterview.com
Question: Explain "Buffer class" in Node.JS?

Answer: It is a global class which can be accessed in an application without importing buffer modules. Source: CoolInterview.com
Question: Explain variables in Node.js?

Answer: Variables are used to store values and print later like any conventional scripts. If ?var? keyword is used then value is stored in variable. You can print the value in the variable using - console.log().

Eg:
$ node
> a = 30
30
> var b = 50
undefined
> a + b
80
> console.log("Hi")
Hi
undefined Source: CoolInterview.com
Question: Explain Child process module?

Answer: Child process module has following three major ways to create child processes:?

spawn - child_process.spawn launches a new process with a given command.
exec - child_process.exec method runs a command in a shell/console and buffers the output.
fork - The child_process.fork method is a special case of the spawn() to create child processes. Source: CoolInterview.com
Question: Why to use ?SetTimeout? in Node.JS?

Answer: This is the global function and it is used to run the callback after some milliseconds.

Syntax of this method ?

setTimeout(callbackmethod, millisecs) Source: CoolInterview.com
Question: What is the latest version of Node.js available?

Answer: Node.js v6 is the latest version of Node.js available and ready for use!

This new major version of Node.js delivers significant improvements in performance, reliability, usability and security. Module loading is nearly four times faster than in Node.js v4, tests and documentation have seen significant improvements, usability of the Buffer and File System APIs have been improved, and Node.js now supports 93% of ES6 language features, thanks to V8 version 5.0. Source: CoolInterview.com
Question: List out some REPL commands in Node.js?

Answer: Below are the list of REPL commands ?

Ctrl + c - For terminating the current command.
Ctrl + c twice ? For terminating REPL.
Ctrl + d - For terminating REPL.
Tab Keys - list of all the current commands.
.break - exit from multiline expression.
.save with filename - save REPL session to a file. Source: CoolInterview.com
Question: How you can update NPM to new version in Node.js?

Answer: Below commands can be used for updating NPM to new version ?

$ sudo npm install npm -g
/usr/bin/npm -> /usr/lib/node_modules/npm/bin/npm-cli.js
npm@2.7.1 /usr/lib/node_modules/npm Source: CoolInterview.com
Question: Who developed Node.js?

Answer: Node.js was developed in 2009 by Ryan Dahl. Source: CoolInterview.com
Question: Explain ? ?console.log([data][, ...])? statement in Node.JS ?

Answer: This statement is used for printing to ?stdout? with newline and this function takes multiple arguments as ?printf()?. Source: CoolInterview.com
Question: Why to use ?__filename? in Node.JS?

Answer: ?__filename? is used to represent the filename of the code which is being executed. It used to resolve the absolute path of file. Below is the sample code for the same ?

Console.log(__filename); Source: CoolInterview.com
Question: What are scales?

Answer: Node.js is a very powerful JavaScript based platform or framework which is built on Google Chrome's JavaScript V8 Engine. Source: CoolInterview.com
Question: Why to use ?ClearTimeout? in Node.JS?

Answer: This is the global function and it is used to stop a timer which was created during ?settimeout()?. Source: CoolInterview.com
Question: What is report variant for off cycle activities, what do we do in this step?

Answer: ?Path? module will be used for transforming and handling file paths. Below is the syntax of path module ?

var mypath = require("path") Source: CoolInterview.com
Question: What are the differences between readUIntBE and writeIntBE?

Answer: readUIntBE - It?s a generalized version of all numeric read methods, which supports up to 48 bits accuracy. Setting noAssert to "true" to skip the validation.
writeIntBE - This will write the value to the buffer at the specified byteLength and offset and it supports upto 48 bits of accuracy. Source: CoolInterview.com

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