Lookup() method is used to perform a DNS lookup and resolve a domain name into an IP address. There are four types of streams available in Node.js, including readable https://wizardsdev.com/en/vacancy/middle-nodejs-developer-3/ streams, writable streams, duplex streams, and transform streams. The console.time and console.timeEnd methods allow you to measure the duration of a block of code.

This table compares various courses offered by Simplilearn, based on several key features and details. Yes, Node.js provides built-in support for cryptography through the crypto module. Please explain the process of implementing them in terms of HTTP APIs. Finally, separating your app and server can make it easier to switch to a different server if necessary.

Core Java Cheat Sheet – Basics Of Java Programming

See how candidates code, communicate and collaborate with 360° technical interviews. Client and services communicate with each other with many different types of communication. Mainly, those types of communications can be classified in two axes. No additional server or infra required to store session information.

Node.js Developer interview questions

Exec – child_process.exec method runs a command in a shell/console and buffers the output. Very Fast – Being built on Google Chrome’s V8 JavaScript Engine, Node.js library is very fast in code execution. Imagine you’re building a real-time multiplayer game where players can move around a virtual world and interact with each other. To make this work, you need to establish a persistent, bidirectional communication channel between the game client (running in the player’s web browser) and the game server .

What is npm? What is the main functionality of npm?

We can manage the packages in our Node.js project by using several package installers and their configuration file accordingly. The npm and yarn both provide almost all libraries of JavaScript with extended features of controlling environment-specific configurations. We can use package.json and package-lock.json to maintain versions of libs being installed in a project. So, there is no issue in porting that app to a different environment.

Node.js Developer interview questions

An asynchronous callback is a function that is executed after an asynchronous operation completes. When the asynchronous operation returns a result, it triggers this function to perform additional tasks. To ensure the project manager truly understood, I provided a step-by-step walkthrough of how this would work in our project, using everyday language and avoiding technical jargon. For example, instead of talking about “server-side events” and “client-side listeners,” I focused on how the application would immediately respond to any changes made by users. The application was able to handle the high traffic load, and the users were satisfied with the chat’s responsiveness. This experience taught me the importance of selecting the right technologies and libraries for a specific problem and adapting my approach to tackle challenges effectively.

Intermediate Node.js Interview Questions – Moderate Level

The processes in the back end communicate with a database to serve incoming requests. You can include an HTTP server in your Node module by using the http module. The http module provides an API for creating and interacting with HTTP servers and clients.

Node.js Developer interview questions

It typically contains multiple nested callback functions which in turn make the code hard to read and debug. It is caused by improper implementation of the asynchronous logic. Node.js uses a single threaded model in order to support async processing. With async processing, an application can perform better and is more scalable under web loads. Thus, Node.js makes use of a single-threaded model approach rather than typical thread-based implementation.

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Since Node.js is an event-driven language, you can easily attach a listener to an event and then when the event occurs the callback will be executed by the specific listener. Whenever functions like setTimeout, http.get, and fs.readFile are called, Node.js executed the event loop and then proceeds with the further code without waiting for the output. Once the entire operation is finished, Node.js receives the output and then executes the callback function. This is why all the callback functions are placed in a queue in a loop.

  • When the queue has been exhausted or the callback limit is reached, the event loop will move to the next phase, and so on.
  • Also wrapping the async calls in try/catch won’t help because the errors happen asynchronously.
  • Callbacks are functions used to handle asynchronous operations.
  • But since many people who are learning it come from both the backend and frontend, it doesn’t mean that it is easy to get the dream Node.js job.
  • Robert is a highly motivated professional with enterprise-level experience.
  • There is more to interviewing than tricky technical questions, so these are intended merely as a guide.

Node.js is a server-side JavaScript runtime environment built on top of the V8 JavaScript engine, the same engine that powers Google Chrome. It makes Node.js very fast and efficient, as well as highly scalable. As shown below, the async code asks the JavaScript engine running the code to wait for the request.get() function to complete before moving on to the next line for execution. Streams are objects that enable you to read data or write data continuously. Your personal data will be processed in order to handle your question, and their administrator will be The Software House sp. Other information regarding the processing of personal data, including information on your rights, can be found in our Privacy Policy.

Interview Questions on Asynchronous Programming

Node Js is faster and more efficient than other popular frameworks because of itsv8 engine. The v8 engine compiles and executes JavaScript code faster than other frameworks, making Node Js applications run faster. Additionally, Node Js is single threaded, meaning it can handle more simultaneous requests than other frameworks. This makes Node Js more efficient and cost-effective to run. Node Js enables web developers to create web applications quickly and easily. It provides an event-driven, non-blocking I/O model for web applications.

Node.js Developer interview questions

This can be achieved by attaching named events that are emitted by the object using an eventEmitter.on() function. Thus whenever this object throws an event, the attached functions are invoked synchronously. On the other hand, the programmer errors are actual bugs in the application. Global installation of dependencies is stored in /npm directory. While local installation of dependencies stores in the local mode.

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