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April 30, 2022
Technical

Node.js Interview Questions

When you're ready to hire someone new for your team, it's important to think about what questions you should ask during the interview. You want to focus on the questions that are most relevant for your team and role you're hiring for, so you can understand how candidates will use their skills and experience to contribute to your company.

Look for someone with different areas of expertise from your own—this way, you can supercharge your team and get more done!

What Are the Questions Asked in an Node.js Interview?

Sitting someone down for an interview is often stressful and difficult, but with some preparation ahead of time you can make it much easier to find the right person for your team.

We’ve put together a list of Node.js interview questions that will help you evaluate candidates and determine whether they’re a good fit for your team.

Below are the Node.js interview questions we've had the most success with over the years. They're meant to be used as a guide. You can add your own questions and tweak them as needed.

We've divided them into two sections:

  • Basics
  • Core
  • Concurrency

Basics

  • What is Node.js?
  • How does Node.js work?
  • What are the pros and cons of Node.js?
  • What JavaScript engine does Node.js use?
  • What is NPM? What are the alternatives to NPM?

Core

  • Explain the concept of middleware in Node.js?
  • Explain the Difference between setImmediate() vs setTimeout().What is an EventEmitter in Node.js?
  • What is the difference between readFile vs createReadStream in Node.js?
  • Explain the concept of JIT and highlight its relation with Node.js
  • What are streams in Node.js? What are its types?
  • What is a control flow function? What are the steps does it execute?

Concurrency

  • Why is Node.js single-threaded?
  • Explain the event loop.
  • What is the difference between asynchronous and synchronous functions?
  • What is callback hell? How do you deal with it?
  • What is the difference between spawn() and fork() methods in Node.js?
  • How does Node.js handle the child threads?

Interview Scorecard Templates by InterviewTime

To save everyone's time, InterviewTime has created a list of templates available for you to use as-is or as inspiration for creating your own interview scorecard template based on what information will be useful for hiring in your company!

To learn more about scorecards, check out our article - Interview scorecard: pros & cons.

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