Through “Libuv”, Node.js gets access to the multi-threading capabilities of the underlying operating system. This process can return a response only after the file is pushed into the buffer completely, moreover, the process must read the file fully. It stores documents using the “BSON” format, which means “Binary JSON”. Node.js works very well with databases like MongoDB, which is a key advantage of this runtime environment. Describe the projects you have and how the contribution of the Node.js developer will help your organization. Explain whether you have development projects, maintenance projects, or both.
- This means that setImmediate() has a higher priority than setTimeout().
- Try your best to prove your knowledge on instance creation, class methods and static methods.
- Node.js is single-threaded, which means that it can only execute one task at a time.
- These tests should focus on testing the functionality of the endpoint in isolation without making any external requests or dependencies.
- Finally, separating your app and server can make it easier to switch to a different server if necessary.
- NaN and Infinity are two special values that can be the result of operations that normally return numbers.
Cluster is a process to handle thread execution load while working with multi-core systems. In order to check for the proper working of the code, we need to verify error-free execution. In this regard, error-first callbacks are used, which will send error first, followed by related data to the error. Non-blocking operations in Node Js are carried out with the help of the event loop.
How does Node.js overcome the problem of blocking I/O operations?
If you study the questions and answers presented in this guide, you should get a pretty good idea of what you can expect from the candidate. Event Emitter is a special module that smooths the path of communication between objects in NODE.js. It is at the core of asynchronous event-driven architecture of NODE. An event emitter is a pattern that listens to a named event, fires a node.js callback, then emits that event with a value.
Node.js is great for some applications but can introduce significant problems in the wrong context. To address these shortcomings, developers create and use various frameworks. Although this list is long and ever-changing, you should know at least half a dozen popular frameworks and what they offer. Now that we’ve covered some of the popular Node.JS beginner interview questions, https://wizardsdev.com/en/vacancy/junior-node-js-developer/ let’s move on to the advanced Node.JS interview questions and answers for experienced web developers. Developer candidates often dislike traditional coding tests, because they have to remember algorithms they simply don’t use in their everyday work. DevSkiller testing is different and developers appreciate the chance to use normal coding tools and conventions.
Your employee is no longer a beginner but an experienced developer who knows the subtleties and accurately identifies the system’s advantages and disadvantages. In this section, not theoretical Node.js expert interview questions but practical issues related to coding and solving complex problems are already critical. With answers to advanced Node.js interview questions, you will have a complete picture of your employee and their appropriate experience for that level. It is possible to make hiring Node.js specialists understandable and almost effortless. That is why we have prepared Node.js interview questions and answers for experienced candidates and beginners to make an employer’s life much easier. In our article, you can see the questions for the junior, middle, and senior Node.js developers to get acquainted with soft skills questions, which help to get to know the candidate.
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This means that setImmediate() has a higher priority than setTimeout(). Worker threads and clusters are two different approaches to leveraging the power of multiple CPUs in Node.js. While clusters create multiple instances of a Node.js process, each running on a separate CPU core, worker threads provide a way to create multiple threads within a single process. Front-end developers focus on the client side of the application, while back-end developers focus on the server side of the application.
List down the major benefits of using Node.js?
Spawn() launches a new process with the available set of commands. NPM stands for Node Package Manager, responsible for managing all the packages and modules for Node.js. A web server using Node.js typically has a workflow that is quite similar to the diagram illustrated below.
In Node.js, the fs module provides methods for working with the file system. Stat() method returns an object that contains information about the file, such as the file size, creation date, and modified date. The crypto module is widely used in Node.js applications to generate secure random numbers, create digital signatures, and verify signatures. It also provides support for various encryption algorithms such as AES, DES, and RSA. Global objects in Node.js are objects that are available in all modules without the need for an explicit require statement.