Logical errors occur when the written code is correct but produces an incorrect result. Developers can debug and test these errors using the Node Js error handling functions. These include try/catch blocks, the error-first callback pattern, and Promises. Node Js developers are IT professionals responsible for designing, developing, and testing Node Js applications. Node Js developers typically work on web applications that leverage Node Js frameworks, such as Express.js and Sails.js. They handle Node Js development tasks like API integration, server configuration, debugging, and unit testing.

Node.js Developer interview questions

The time required to run this code in Google Chrome is considerably more than the time required to run it in Node.js. Explain why this is so, even though both use the v8 JavaScript Engine. However, uncaughtException is a very crude mechanism for exception handling and may be removed from Node.js in the future. In Node.js, the concept of Punycode Middle+ Node.js Developer job is used for converting one type of string into another type. Punycode is an encoding syntax used for converting Unicode (UTF-8) string of characters into a basic ASCII string of characters. Now, the hostnames can only understand the ASCII characters so, after the Node.js version 0.6.2 onwards, it was bundled up with the default Node package.

Why is Node.js Single-threaded? Is Node.js synchronous or asynchronous?

Task function and concurrency value are the two arguments async.queue takes. A file can be opened in Node.js using the fs.open() method. This method takes two arguments, the path of the file and the flags.

  • Event mechanism helps server to respond in a non-bloking ways and makes server highly scalable as opposed to traditional servers which create limited threads to handle requests.
  • Some common challenges that backend Javascript developers may face include working with asynchronous code, managing dependencies, and optimizing code for performance.
  • Because of the event mechanism in Node.js, there is no buffering.
  • Callback function is used in node.js to deal with multiple requests made to the server.

So, when dealing with TCP streams or the file system, it’s necessary to handle octet streams. Express.js is a framework built on top of Node.js that facilitates the management of the flow of data between server and routes in the server-side applications. It is a lightweight and flexible framework that provides a wide range of features required for the web as well as mobile application development. Express.js is developed on the middleware module of Node.js calledconnect.

Which database is more popularly used with Node.js?

We probably don’t need to tell you the countless hours of interviews and in-house testing this method can save, compared to traditional testing. JavaScript | Node.JS | File system - Use NodeJS to read/write files in sync and async way, list directories recursively. Libuv by default creates a thread pool with four threads to offload asynchronous work to. Today’s operating systems already provide asynchronous interfaces for many I/O tasks (e.g. AIO on Linux). Whenever possible, libuv will use those asynchronous interfaces, avoiding usage of the thread pool. Try...catch with async/await - ES7 Async/await allows us as developers to write asynchronous JS code that look synchronous.

Node.js Developer interview questions

Node.js is a platform on which JavaScript code can run on the server-side. Develop the server.js file in order to make the WebSocket server ready. Python | Django | Leave request application | Basic CRUD - Complete an application for managing employee leave requests using Django Framework.

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For example, when you open a file it is an event when you close a file it is an event. Exports is a default application that can be found in every js file of Node js. Ryan Dahl is the author of https://wizardsdev.com/ Node.js it was almost 13 years back when the javascript environment was introduced to the world. Initially, Node is was supported by Linux and Mac OS X but later it was sponsored by Joyent.

You may want to rewrite some of the modules in C++ for performance reasons. The difference between a cluster module and a load balancer is that instead of distributing load between processes, the balancer distributes requests. V8 was first designed to increase the performance of the JavaScript execution inside web browsers.

What do you understand by callback hell in Node.js?

If you want to use it with other Node.js versions, then use npm to install Punycode module first. Following is a list of tools that can be used in developing code in teams, to enforce a given style guide and to catch common errors using static analysis. It specifies a computer environment like a window console or Unix/Linux shell where you can enter a command, and the computer responds with an output. This method doesn’t generate a new V8 instance, and only a single copy of the node module is active on the processor. Modules are like JavaScript libraries that can be used in a Node.js application to include a set of functions.

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The Multi-Threaded Request/Response Stateless Model is not followed by the Node JS Platform, and it adheres to the Single-Threaded Event Loop Model. The Node JS Processing paradigm is heavily influenced by the JavaScript Event-based model and the JavaScript callback system. As a result, Node.js can easily manage more concurrent client requests. The event loop is the processing model's beating heart in Node.js. If you find these Node.js interview questions with answers helpful, please share them with your friends and colleagues. If you have any questions or feedback, then please drop a note.

Differentiate between readFile vs createReadStream in Node.js?

The connect module further makes use ofhttpmodule to communicate with Node.js. Thus, if you are working with any of the connect based middleware modules, then you can easily integrate with Express.js. Node.js is an extremely powerful framework developed on Chrome’s V8 JavaScript enginethat compiles the JavaScript directly into the native machine code. It is a lightweight framework used for creating server-side web applications and extends JavaScript API to offer usual server-side functionalities. It is generally used for large-scale application development, especially for video streaming sites, single page application, and other web applications. Since Node.js is by default a single thread application, it will run on a single processor core and will not take full advantage of multiple core resources.

Node.js Developer interview questions