Common Node js interview questions and answers
Node js developers are in high demand.
With so many companies trying to build Node js apps, hiring devs is difficult. What’s more, making the wrong hire could cost your company thousands of dollars.
So if you want to hire the best Node js developers, you must craft a compelling job description. Then, you need to test the skills and knowledge of the developers who apply to see whether they can meet your demands.
Our common Node js interview questions can help you test these skills. You’ll get to know your Node js developers, and you can dig into their applications.
But what questions should you ask?
Aside from the standard questions like “What have you accomplished?” and “What are your strengths?”, you’ll want to assess your candidate’s knowledge of Node js.
And in this blog, you’ll find common Node js interview questions to help you do this.
Let’s go!
Common Node js interview questions and answers
Q: What are the benefits of using Node js?
- Node js APIs are asynchronous, so they don’t cause blocks. Blocks happen when a server doesn’t wait for the return of data once an API has been called. What happens with Node js is there’s a mechanism in place that gets the response from the previous API call. In other words, Node js is event-driven.
- Because Node js is event-driven, there’s no buffering. Instead, the data output occurs in chunks.
- Node js is powered by Google’s Chrome V8 JavaScript engine. This leads to lightning fast code execution in the Node js library.
Q: Why is Node.js Single-threaded?
Node js is single-threaded for async processing. It’s based on a single-thread model with event looping.
By doing async processing on a single-thread, Node js can service far more requests compared to something like Apache HTTP server.
Q: Why is Node js often preferred over other backend technologies like Java and PHP?
Some of the reasons why Node js is preferred include:
- Node js has super fast performance
- Node Package Manager (NPM) has over 2 million packages available for developers to use
- Node js is great to use when building data-intensive, real-time web applications because it doesn’t waits for APIs to return data
- The code between server and client can sync more easily because they use the same code base
- It’s easier for developers to start using Node js in their projects because it use JavaScript
Q: What is the difference between Angular and Node.js?
Angular:
- A frontend development framework
- Written in TypeScript
- Used for building single-page, client-side web apps
- Splits web applications into MVC components
Node js:
- A server-side environment
- Written in C, C++ languages
- Used for building fast and scalable server-side networking apps
- Generates database queries
Q: How is operational error different from programming error?
An operational error occurs naturally and is part of an application’s flow. Programming errors are referred to as bugs that are caused by developers.
Q: What are some of the most commonly used libraries in Node js?
Two commonly used libraries in Node js are:
- ExpressJS – Express is a flexible framework with lots of features to help developers build web and mobile apps in Node js
- Mongoose – Mongoose is also a Node js web application framework that makes it easy for developers to connect apps to databases.
Q: What are the disadvantages of Node js?
Node js has one main disadvantage which is that responses can be blocked if lots of CPU computation is used at once.
In such cases, multiple thread options are better than single thread options, but they’re sluggish in performance.
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So these common Node js interview questions and answers should help you hire a Node js developer or two for your company.
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