Node.js Interview Questions and Answers

nodejs interview questions and answers

Node.js Interview Questions and Answers

Node is an open source toolkit for developing server-side applications based on the V8 JavaScript engine. Like Node, V8 is written in C++ and is mostly known for being used in Google Chrome. Node is part of the Server-Side JavaScript environment and extend JavaScript API to offer usual server-side functionalities. Historically, JavaScript was used primarily for client-side scripting, in which scripts written in JavaScript are embedded in a webpage’s HTML, to be run client-side by a JavaScript engine in the user’s web browser. Node.js enables JavaScript to be used for server-side scripting and runs scripts server-side to produce dynamic web page content before the page is sent to the user’s web browser. Consequently, Node.js has become one of the foundational elements of the “JavaScript everywhere” paradigm, allowing web application development to unify around a single programming language, rather than rely on a different language for writing server-side scripts.

Node.JS specially built to work on Google chrome browser only. It is a rather powerful JavaScript platform that runs only on chrome. It is used to develop an indebt web application like video streaming sites, single page application and other web applications. Node.js is a run time system for creating server-side applications. This software is developed specially for software programmers to learn the basics of Node.js and to make them do it in a simple and realistic way. It is designed in such a way that a good and clear understanding will be attained.

Though .js is the conventional filename extension for JavaScript code, the name “Node.js” does not refer to a particular file in this context and is merely the name of the product. Node.js has an event-driven architecture capable of asynchronous I/O. These design choices aim to optimize throughput and scalability in Web applications with many input/output operations, as well as for real-time Web applications (Real-time communication programs and browser games).  Current version  is node.js  15.2.1 (Nov 16, 2020).

What is Node.js?

What is the difference between AngularJS and Node.js?

Why Node.js is being used?

What are the features of Node.js?

Why Node uses Google V8 Engine?

What is NPM in Node.Js?

What are the two types of API functions in Node.js?

How does it Work?

What is a Node.js File?

How to scale Node application?

What is stream and types of streams?

What is event loop?

What is callback hell?

What are Error First Callbacks in Node.js?

What is libuv?

What is Chaining Process in Node.Js?

What are the two arguments that async.queue takes?

What is <Package.Json>?

Explain the role of REPL in Node.js?

What is Event-driven programming?

Which is the most compatible framework used in NodeJs?

What are Globals in Node.js?

What is the difference between Node.js vs Ajax vs JQuery?

How to solve process out of memory in Node.js?

How will you debug an application in Node.js?

What are the disadvantages of Node.JS?

For More:

What are the NodeJS Frameworks?

How to create HTTP Server in Nodejs?

How to load HTML in Node.js?

What is Got in NodeJS?

What is REPL?

What are the some REPL commands?

Can you explain, which is the first argument usually passed to a Node.js callback handler?

How to make Post request in Node.js?

How to get Post Data in Node.js?

What is Punycode?

What is Readfile?

Can you explain the timing features of Node.js?

What is crypto in Node.js? How is it used?

What is the use of NODE_ENV?

Can you explain libuv?

Which module is used for file-based operations?

Which module is used for buffer-based operations?

Which module is used for web-based operations?

How will you read a file using Node?

What are the NodeJS libraries?