Node.js Interview Questions

Node.js interview questions

These Node.js questions have been designed for various interviews, competitive exams and entrance tests. We have covered questions on both basic and advanced concepts which will help you improve your skills to face interview questions on Node.js.

Who is this Node.js interview questions designed for?

All the Web developers, Front End developers, UI/ UX developers and designers will find these questions extremely useful. All freshers, BCA, BE, BTech, MCA and college students wanting to make a career in front end designing will be highly benefitted by these questions.

Node.js interview questions topics

This section covers Node.js topics like - Node.js Modules, HTTP Module, File System, URL Module, NPM, Events etc.

1. What is Node JS?

Answer:

Node.js is an open source server framework built on Google Chrome's JavaScript Engine (V8 Engine). It is the server side JavaScript platform. Node.js applications are developed in JavaScript and it can be run on various platforms like Windows, Linux, UNIX, Mac OS X, etc.

Node.js is not a JavaScript library, but it is a platform to execute JavaScript on server side.

2. What are the benefits of using Node.js?

Answer:

Following are the benefits of the using Node.js.

  • Web application developed in JavaScript is incredibly fast.
  • API of the Node.js library is asynchronous which means server never waits for an API return data.
  • Node.js can handle thousand of concurrent connection.
  • Node.js is supports the exchange of the data using JSON. This makes it light weight as compared to another framework.
  • Large number of libraries are available in Node.js which enhance the development time.

3. Where can we deploy node application?

Answer:

Node.js application cannot be deployed on our existing host server. We use VPS or other server to install node and run on our web application.

4. What does event-driven programming means?

Answer:

It is a programming paradigm in which the flow of program is determined by user action like mouse clicks, key press. Event driven programming is basically used in graphical user interface and JavaScript web application.

It is an application architecture technique divided into two sections

  • Event Selection
  • Event Handling

5. What is the key feature of Node.js?

Answer:

Following are the key feature of Node.js.

  • It uses JavaScript as a programming language for both front-end and back-end.
  • Node.js applications are highly scalable which helps to improve our application performance.
  • A latest version of Node.js is focused on performance improvements and provides better security.
  • Node.js supports the caching features, so it improves load time of the application.
  • We can develop Restful services API using Node.js.
  • Node.js application supports multiple unit testing frameworks.

6. What is NPM and its need in Node.js?

Answer:

NPM stands for Node Package Manager. The NPM package manages and support various command to install and remove from the module.

It is the online repository of node package and share open source library like jQuery, Angular JS etc.
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