Top 101 Node js Interview Questions and Answers in 2023

Node contains a child_process module to spawn multiple processes for handling events or executing code. The main two methods of creating a child process is through spawn() and fork(). Node.js essentially provides a runtime for javascript to function much like a general programming language. As such, it can be used to handle file systems, operating systems, servers, APIs, etc. For example, a function to read a file may start reading file and return the control to execution environment immediately so that next instruction can be executed. Asynchronous event driven IO helps concurrent request handling – All APIs of Node.js are asynchronous.

This is why all of the callback functions are put into a loop in a queue. They are carried out one by one after receiving the response. In Node.js, https://globalcloudteam.com/ process.nextTick() and setImmediate(), both are functions of the Timers module which help in executing the code after a predefined period of time.

Interview Questions

It is an open-source network that can be written in the c++ language. Javascript engine is used to run the java code in the browser so you can define a javascript engine as a computer program that is used to perform the java code. Initially, it was just used for interpretation and progressively it improved and got evolved. Generally, all browsers have one dealer and he is the one who develops the javascript engine. Name and explain some of the flags used in file read/write operations.

• An event emitter is a pattern that listens to a named event, fires a node.js callback, then emits that event with a value.
• A single thread from the Thread Pool is assigned to a single complex request.
• An event loop in Node.js handles all the asynchronous callbacks in an application.
• Express.js is developed on the middleware module of Node.js calledconnect.
• Dependencies – Dependencies that your project needs to run, like a library that provides functions that you call from your code.
• Your applicants may not have every backend developer skill you require.
• Tests the candidate’s knowledge and experience with network application development, as well as their problem-solving skills.

This method simply means that multiple workers are running on a single Node code base for various task. Thepackage.json file in Node.js is the heart of the entire application. It is basically the manifest file that contains the metadata of the project where we define the properties of a package.

What are the modules in Node.js?

Internally, there are several POSIX threads for different I/O operations like File, DNS, etc. Because of the event mechanism in Node.js, a callback Node.js developer function is called every time an event starts. Do you want to be successfully placed as a Node.js developer in a top Silicon Valley company?

This instruction serves to specify parts of the module that should be accessible from other files. Of all the basic questions about Node.JS, this is certainly the main one. Naturally, this is also often the first or one of the first questions that you can ask in an interview. In general, it’s important that you don’t discard the main questions just because they can be “easy” or “not important”. Geniusee Charity Fund Our work is global, but Geniusee’s homeland is Ukraine.

How many types of API functions are available in Node.js?

However, if the promise gets rejected, then the second function will get called. Node.js is a popular server-side platform used by many companies. If you are preparing for a career change, it’s always a good idea to brush up on your interview skills beforehand. Although there are a few commonly asked Node.js interview questions that you might be aware of, we also recommend you to focus on exclusive Node.js interview questions. It is thought that performing async processing on a single thread can offer more speed and scalability than a typical thread-based implementation/approach under average web loads.

We can also use it for developing distributed systems, general-purpose, real-time, and network applications. This article focuses on top Node JS interview questions to help you prepare better, no matter what your level of experience. Whenever an event gets fired, its listener function starts executing.

Have you ever encountered a major roadblock when working on a project? How did you handle it?

“Hume made my video interviews a breeze. Automatic transcriptions, Q&A analysis, and easy collaboration with my team improved the quality and efficiency of my process.” Node.js library uses JavaScript – This is another significant part of Node.js from the engineer’s perspective. Subsequently, improvement in Node.js gets simpler for an engineer who knows JavaScript.

With REPL, the JavaScript can enter the shell post directly and reliably perform tasks like debugging, testing, and experimenting. There are always new modules and tools being made to abstract the backend architecture and improve processes whether it be in IPC, working with Sockets, or developing REST APIs. Note that more complicated server architecture such as a REST API would typically be created using a framework, for instance Express.

How can you prevent CallBack hell?

Express.js is a flexible web application framework in Node.js with a broad array of features to develop all types of mobile and web applications. Express.js is a Node.js-based framework for managing the flow of data between the server and server-side web applications. It’s a lightweight and adaptable framework with a variety of capabilities for online and mobile app development. Connect, a Node.js middleware module serves as the foundation for Express.js. In order to communicate with Node.js, the connect module uses the HTTP module.