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Questions and Answers – Node.js

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Node.js is a very widely used server-side platform that increasingly more organizations are using. In case you’re setting up for a career move and also have an upcoming job interview, it is generally a wise decision to plan and clean up on your job interview skills in advance. Even though there are a few generally asked Node.js interview questions pop up throughout all kinds of interviews, we additionally suggest that you prepare yourself by concentrating on exclusive questions to the specific industry of yours.

We’ve developed an extensive listing of typical Node.js interview questions at that show up frequently in interviews as well as the greatest methods to reply to these questions. This will even enable you to understand the fundamental ideas of Node.js.

Beginner Node.js Interview Questions

  1. What’s Node.js? Anywhere are you able to use it?

Node.js is an open source, cross platform JavaScript runtime environment and library to operate web uses outside of the client’s web browser. It’s used to create server side web applications.

Node.js is ideal for data intensive uses as it uses an asynchronous, event driven model. You are able to utilize I/O intensive web applications as video streaming websites. You are able to further put it to use for developing: Real time web applications, General-purpose applications, Network applications, and also Distributed systems.

  1. Why use Node.js?

Node.js can make building scalable network programs simple. Several of its benefits include:

It’s usually fast
It seldom blocks
It has a single programming language and data type
Things are asynchronous
It produces great concurrency

  1. How does Node.js work?

A web server using Node.js generally features a workflow that’s very like the diagram illustrated below. Let us check out this particular flow of operations in detail.

Clients send out requests to the webserver to have interaction with the net program. Requests can be non blocking or perhaps blocking:
Querying for data
Deleting data
To update the information Node.js retrieves the new requests and also gives those towards the Event Queue
The requests are then passed one-by-one through the Event Loop. It determines whether the requests are basic enough never to need some outside resources
The Event Loop processes basic requests (non blocking operations), like I/O Polling, and also returns the reactions to the corresponding clients

A single thread from the Thread Pool is given to an individual intricate request. This particular thread is responsible for finishing a certain blocking request by accessing outside resources, like computation, file system, database, etc.

After the task is performed totally, the result is delivered to the Event Loop which sends that response to the client.

  1. Why is Node.js Single threaded?

Node.js is single threaded for async processing. By doing async processing over a single thread under regular net loads, extra performance and scalability could be attained rather than the usual thread based implementation.

  1. Explain callback in Node.js.

A callback feature is known as after a certain task. It allows for some other code to be run at the same time and prevents some blocking. To be an asynchronous platform, Node.js greatly depends on callback. All APIs of Node are written supporting callbacks.

  1. Would you define the phrase I/O?

The word I/O is utilized for describing some system, operation, or maybe device that transfers information to and starting from a medium and also to or perhaps from another medium Every transfer happens to be an output from one medium as well as an input into another. The medium is usually an actual device, network, or maybe files within a system

  1. How’s Node.js most often used?

Node.js is popular in the following applications:

Real-time chats
Internet of Things
Advanced SPAs (Single Page Applications)
Real-time collaboration tools
Streaming applications
Microservices architecture