Capgemini – Node JS Interview Questions

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

1. What Is NPM In Node.Js?

NPM is a package manager for Node. js packages which hosts thousands of free packages to download and use. The NPM program is installed on the computer when Node.js is installed, NPM is already ready to run on the computer.

2. What Is Package.Json? Who Uses It?

A Package.json is a JSON file that exists at the root of a JavaScript/Node project. It holds metadata relevant to the project and it is used for managing the project's dependencies, scripts, version and a whole lot more.

3. What Is Chaining Process In Node.Js?

Parallel (tasks, callback) is a collection of functions that runs parallel in practice through I/O switching.
Series (tasks, callback) in tasks run only after the previous function is completed.

4. What Is A Child_process Module In Node.Js?

The child_process module provides the ability to spawn subprocesses in a manner that is similar, but not identical, to popen. It is primarily provided by the child_process. spawn() function: const { spawn } = require('child_process'); const ls = spawn('ls', ['-lh', '/usr']); ls.

5. Explain What is a Javascript Engine ?

A JavaScript engine is a computer program that executes JavaScript code which is typically developed by web browser vendors, and every major browser has one. The JavaScript engine runs in concert with the rendering engine via the Document Object Model in the browser.

6. Explain V8 Engine ?

V8 is Google's open source high-performance JavaScript and WebAssembly engine, written in C++ which is used in Chrome and in Node.js, among others. It implements ECMAScript and WebAssembly, and runs on Windows 7 or later, many other processors.

7. Explain ECMAScript ?

ECMA Script is the scripting language that forms the basis of JavaScript. It is standardized by the ECMA International standards organization in the ECMA-262 and ECMA-402 specifications.

8. How can you check the installed version of Node Js ?

To see if Node is installed, open the Windows Command Prompt, Powershell or a similar command line tool, and type node -v . This should print the version number so you'll see something like this v0. 10.35 .

9. Explain What is NPM ?

NPM-Node Package Manager is a package manager for the JavaScript programming language maintained by npm, Inc. It consists of a command line client and an online database of public and paid-for private packages.

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10. Explain Modules in Node Js ?

Module in Node.js is a simple or complex functionality organized in single or multiple JavaScript files which can be reused throughout the Node.js application.

Module Types

Core Modules
Local Modules
Third Party Modules

11. What are CommonJs Modules ?

Common JS is a module formatting system which is a standard for structuring and organizing JavaScript code. It assists in the server-side development of apps and its format has heavily influenced Node JS module management. Common JS modules basically contain two primary parts: a free variable named exports and a require function that modules can use to import the exports of other module.

12. Explain the basics of Node.js.

Node.js is a cross-platform environment and library for running JavaScript applications which is used to create networking and server-side applications. Features of Node.js,

Extremely fast
I/O is Asynchronous and Event Driven
Single threaded
Highly Scalable
No buffering

13. How are ‘Child Threads’ handled in Node.js?

The child_process module gives the node the ability to run the child process by accessing operating system commands. The worker_threads module enables the use of threads that execute JavaScript in parallel.

14. State some differences between Angular JS and Node.js.

Angular JS	Node.JS
It is a structural framework for developing dynamic web apps.	It is a cross-platform run-time environment for applications written in JavaScript language.
It is entirely written in JavaScript.	It is written in C, C++ and JavaScript.

15. State the primary uses of Node.js.

Node.js is primarily used for non-blocking, event-driven servers, due to its single-threaded nature. It's used for web sites and back-end API services, but was designed with real-time, push-based architectures in mind.

16. What is Event-Driven programming?

Event-Driven Programming makes use of the following concepts:

An Event Handler is a callback function that will be called when an event is triggered.
A Main Loop listens for event triggers and calls the associated event handler for that event.

17. What is a test pyramid in Node.js?

A test pyramid is a metaphor that helps the grouping of software tests in a bunch of different granularity. Example: unit testing, component testing, integration testing, system testing, end-to-end testing, UI testing, and others.

18. What is the purpose of the Express JS Package?

Express.js basically helps to manage everything, from routes, to handling requests and views. Redis is a key/value store -- commonly used for sessions and caching in Node.js applications.

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Capgemini Node JS Interview Questions