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88 interview questions on NodeJSfor developers (2026)

Test your technical skills before an interview of NodeJS with 88 corrected questions. Beginner, Intermediate or Expert level.

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88 questions
Medium
15 votes922 runs0 comment

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

Back-end developer
performance
gzip
Vincent Cotroat Nov 15, 2023
Expert
10 votes1001 runs0 comment

How to define a global variable with Node.js?

Back-end developer
variables
node.js
Jean-marie Cléryat May 11, 2022
Medium
7 votes990 runs0 comment

Parse a query string into an object in NodeJS

Back-end developer
javascript
node.js
Jean-marie Cléryat May 11, 2022
Easy
4 votes1366 runs0 comment

Install a NPM package via CLI

Back-end developer
cli
npm
Léoat Mar 28, 2022
Easy
4 votes1303 runs0 comment

In which request header is a token usually sent?

Back-end developer
headers
authorization
Léoat Mar 28, 2022
Easy
4 votes1269 runs0 comment

How to start a NodeJS server

Back-end developer
node
server
Vincent Cotroat May 18, 2022
Hard
4 votes1066 runs0 comment

How to get the result of 3 asynchronous functions in NodeJS

Back-end developer
promises
async
javascript
Jean-marie Cléryat May 11, 2022
Hard
4 votes1016 runs0 comment

Given a tree structure and Express middlewares, which file will be returned when calling the `tutorial.mp4` resource?

Back-end developer
express
static
Jean-marie Cléryat May 11, 2022
Medium
4 votes976 runs0 comment

Which of these 4 solutions for serving a very large file will be the most optimized in terms of _server resources_ and _loading speed for the client_?

Back-end developer
nodejs
file
server
Jean-marie Cléryat May 11, 2022
Easy
4 votes908 runs0 comment

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

Back-end developer
events
node.js
Axelat Sep 5, 2023
Easy
3 votes1281 runs0 comment

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

Back-end developer
databases
node.js
Léoat Mar 28, 2022
Easy
3 votes1273 runs0 comment

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

Back-end developer
classes
events
Léoat Mar 28, 2022
Easy
3 votes1270 runs0 comment

What is NPM?

Back-end developer
package manager
npm
Léoat Mar 28, 2022
Hard
3 votes1020 runs0 comment

A simple SocketIO chat server, coupled with Express.

Back-end developer
socket.io
websockets
Jean-marie Cléryat May 11, 2022
Medium
3 votes998 runs0 comment

Which of the following is the odd one out? : npm, yeoman, webpack, babel

Back-end developer
nodejs
yeoman
Jean-marie Cléryat May 11, 2022
Expert
3 votes991 runs0 comment

Write a generator function in NodeJS that yields the numbers from 0 to infinity.

Back-end developer
generators
yield
Jean-marie Cléryat May 11, 2022
Hard
3 votes980 runs0 comment

Write a NodeJS server that returns a different message depending on the route.

Back-end developer
http
server
Jean-marie Cléryat May 11, 2022
Easy
3 votes941 runs1 comment

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

Back-end developer
javascript
runtime
Dragon parfaitat Jun 8, 2023
Medium
2 votes1365 runs0 comment

Start a REPL session on Node.js

Back-end developer
repl
node
Léoat Mar 28, 2022
Medium
2 votes1016 runs0 comment

What will the `result` variable contain at the end of this code?

Back-end developer
promises
async/await
Jean-marie Cléryat May 11, 2022
NodeJS tests