node js interview questions

node js interview questions

Node.js is a server-side JavaScript framework that is used to build fast and scalable server applications. It is primarily used to build server-side applications in conjunction with another programming language like Java, Ruby, or Python.

This blog will help you ace your next Node interview by covering essential Node.js interview questions and answers.

node js interview questions

For any software engineer looking to land a job as a Node developer, it’s important to understand what the hiring manager might ask you in an interview—so you can prepare accordingly! Below you will find some video interview questions on Node JS along with answers and explanations.

What is Node JS? – node js interview questions

Node.js is a server-side JavaScript framework that is used to build fast and scalable server applications. It is primarily used to build server-side applications in conjunction with another programming language like Java, Ruby, or Python.

You can use it to build your real-time web and mobile applications. Node JS is a runtime environment which can execute JavaScript code outside the browser.

It has a robust network application architecture and enables applications to be built asynchronously. Node JS is built on top of Google’s V8 JavaScript engine and is primarily designed to build server-side applications.

How is Node.JS different from other JavaScript Frameworks?

The main difference between Node.JS and other JavaScript-based web frameworks such as Django and Rails is that Node.JS does not rely on a server-side language for implementing functionality.

It’s server-side functionality is built on top of JavaScript and executed in the browser. This means that Node.JS can be run on more platforms and environments than other frameworks, making it easier for developers to deploy their applications.

What are the key benefits of using Node.JS? 

The following are a few key benefits of using Node.JS:

– Excellent Scalability – Node.JS is known to have excellent scalability and is suitable for high-traffic and big data applications. Node.JS applications can easily handle more than 10,000 concurrent users on a single machine.

– Less Code – Node.JS applications usually have less code than traditional applications. This is because Node.JS applications are built on JavaScript that runs in the browser with the help of a server.

– High Performance – Node.JS applications are known to have high performance. This is mainly because it uses non-blocking I/O operations, which allow the application to keep running even after incoming requests.

– Fault Tolerance – Node.JS applications are known to be fault tolerant and are not prone to crashing. This is mainly because the applications can keep running even after a system failure.

– Unlimited Scalability – Node.JS applications can be scaled infinitely without any issues. Node.JS applications are known to be capable of handling millions of requests per day.

– Cross-Platform – Node.JS can be used on any operating system and on any browser and is not dependent on a particular platform.

– High-Level Language – Node.JS applications are built using a high-level language and do not require knowledge of low-level languages such as C.

– Standard Libraries – Node.JS comes with standard libraries that can be used to perform various tasks.

– Single-Threaded – Node.JS applications are single-threaded and do not rely on multithreading.

What are the disadvantages of using Node JS?

There are few disadvantages of using Node.JS as well, such as:

– Lack of Reliability – The absence of a standard way of creating applications can make these applications unreliable.

– Slow Performance – The non-blocking I/O operations are responsible for the slow performance of Node.JS applications.

– Cursory Documentation – The documentation of Node.JS is cursory, which can make it difficult for developers to create applications.

– No Standardized Methodology – The absence of a standardized methodology to create applications can make it difficult to create applications in Node.JS.

– Limited Support – There is limited support for Node.JS on different platforms, such as embedded devices.

– Single-Threaded Architecture – The architecture of Node.JS is single-threaded, which can make it difficult for developers to make use of multi-core machines.

– Lack of Support – Node.JS is not supported on some platforms, such as Internet Explorer.

Define REPL in Node.js and its importance.

REPL stands for “read-eval-print-loop”, which is a tool that enables developers to test and run code on Node.JS either on the command line or in an Integrated Development Environment (IDE).

Its importance lies in the fact that it is a very handy tool that allows you to test your code without having to create a separate application for it.

Which NPM package should you use for RESTful API development? Why?

The npm package you should use for developing a RESTful API on Node.JS is “Express”. Express is a robust and popular Node.JS framework that can be used to create RESTful APIs.

The reason why you should use Express for this purpose is because it is one of the most popular Node.JS frameworks, which means that it has a large community that can help you solve any issues or problems that you might face while using it.

Which NPM package should you use for managing database operations? Why?

The npm package you should use for managing database operations on Node.JS is “MongoDB”. MongoDB is a popular database management system (DBMS) that is used for storing data on Node.JS applications.

The reason why you should use MongoDB for this purpose is because Node.JS applications are known to be based on NoSQL architecture.

Which NPM package should you use for storing data on file system? Why?

The npm package you should use for storing data on file system on Node.JS is “fs”. fs (File System) is a Node.JS module that can be used to read and write data on the file system.

The reason why you should use fs for this purpose is because Node.JS has a built-in module for interacting with the file system.

This means that you will not have to use separate modules for reading/writing data on the file system.

Which NPM package should you use for managing your dependencies? Why?

The npm package you should use for managing dependencies on Node.JS is “Yarn”. Yarn is a newer and more robust version of the npm package manager and can be used to manage your dependencies on Node.JS applications.

The reason why you should use Yarn for this purpose is because it is faster and more robust than npm. This means that Yarn can solve issues such as dependency issues and missing dependencies much faster than npm.

Which NPM package should you use for creating a build process for your application? Why?

The npm package you should use for creating a build process for your application is “Webpack”. Webpack can be used to build and bundle your application’s code into a single JavaScript file.

The reason why you should use Webpack for this purpose is because it can be used for bundling your application’s code, minifying it and adding dependency to it.

Which NPM package should you use for testing your application? Why?

The npm package you should use for testing your application is “Mocha”. Mocha is a JavaScript testing framework that can be used to test your application’s functionality.

The reason why you should use Mocha for this purpose is because it is a popular and robust testing framework that uses a test-first approach. This means that you first write your test cases and then write your application’s code.

What is the process for making a production-ready Node.JS application?

The process for making a production-ready Node.JS application is as follows: – First, you need to create a project in a directory. – Next, you need to create a package.json file inside your project directory

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