39 interview questions on Node.js - Fundamentals for developers (2026)

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39 interview questions on Node.js - Fundamentalsfor developers (2026)

Test your technical skills before an interview of Node.js - Fundamentals with 39 corrected questions. Beginner, Intermediate or Expert level.

39 interview questions on Node.js - Fundamentalsfor developers (2026)

Test your technical skills before an interview of Node.js - Fundamentals with 39 corrected questions. Beginner, Intermediate or Expert level.

What is the best practice to apply in your code to improve the performance of your application?

Install a NPM package via CLI

In which request header is a token usually sent?

How to start a NodeJS server

Write a Node.js code that emits an event and logs it to the console.

What types of databases can a node.js application access?

Which class is used to create custom events in Node.js?

What is NPM?

Node.js is a Javascript execution "runtime" based on V8 engine

Start a REPL session on Node.js

What does npm mean?

When can a CORS error occur?

What is the name of the JavaScript API that allows you to manipulate the content of a page?

How to see the different commands of npm?

When creating an HTTP server with Node, we use the **createServer()** function. We can pass a function to **createServer()** that will react to incoming requests. What arguments does this function receive?

Which of the following is not a valid HTTP method?

Is it generally acceptable to store unencrypted passwords in a database if that database requires an access password?

What does the **hash** function of bcrypt do?

What does the `npm init` command do?

Display the operating system platform in NodeJS

When creating an HTTP server with Node, we use the createServer() function. We can pass a function to createServer() that will react to incoming requests. What arguments does this function receive?

What does the hash function of bcrypt do?