easyrequire and module.exports
What does `module.exports` vs `exports` mean when you write only `exports = { ready: true }` in a module?
// flags.js
exports = { ready: true };
// app.js
console.log(require('./flags'));why this works
Built for NodeJS mastery, not memorisation.
Every question is hand-checked, every answer comes with an explanation, and your progress builds into a clear picture of where you stand.
The snippet is on the page
Every NodeJS question shows its code before you answer, so you are reading real NodeJS, not a description of it.
A written explanation, always
Once you attempt a question you get the reasoning, not just a tick. That matters most on NodeJS, where event-loop phases, the difference between setimmediate and process.
Your weak topics, named
Progress is tracked per topic across the 48 NodeJS topics, so revision points at the gaps instead of the whole list.
faq
Things people ask.
How many NodeJS MCQs are on Journey Uncommon?
519 NodeJS questions right now: 103 easy, 216 medium and 200 hard. That number is read straight from the question table when this page is built, so it is never a rounded marketing figure.
Do I need an account to read the NodeJS questions?
No. Every NodeJS question, including its code snippet, its difficulty and its topic, is readable without signing in. You need a free account only to submit an answer, see which option is correct, and read the worked explanation. We keep it that way so the platform stays honest about what you actually got right.
What do NodeJS interviewers actually test?
Event-loop phases, the difference between setImmediate and process.nextTick, backpressure on streams, cluster and worker threads, and how to avoid blocking the loop.
Which NodeJS topics are covered?
48 distinct topics are tagged on the NodeJS questions, including Worker threads basics, V8 garbage collection, child_process spawning, streams backpressure internals, event loop phases, memory leak debugging. The topic labels come from the questions themselves, so the list matches what you will actually be asked.
Is NodeJS practice free?
Yes. Reading is free and unlimited. A free account unlocks answering, explanations and progress tracking. Pro (₹199 per month) adds AI explanations and AI-graded guesstimates on top; it is not needed to practise NodeJS MCQs.
Where is NodeJS used in real jobs?
API services, BFF layers, build tooling, and serverless functions across most JavaScript-first companies.
What a NodeJS question here actually looks like
These are 12 of the 519 NodeJS questions in the library, pulled live from the question table. The snippet, the difficulty and the topic are all here. The answer options and the explanation are not. Those need a free account.
Event-loop phases, the difference between setImmediate and process.nextTick, backpressure on streams, cluster and worker threads, and how to avoid blocking the loop.
Sample NodeJS MCQs
mediumprocess.nextTick vs setImmediate
Inside a Promise .then() callback, you schedule both a process.nextTick and a queueMicrotask, then resolve another promise. What is the output order?
Promise.resolve().then(() => {
console.log('then');
process.nextTick(() => console.log('nextTick'));
queueMicrotask(() => console.log('microtask'));
Promise.resolve().then(() => console.log('inner then'));
});easyCommonJS vs ES modules
What happens when this CommonJS file runs in Node?
// index.js (no "type": "module")
import os from 'os';
console.log(42);easyhttp server basics
What is wrong with this minimal HTTP server handler?
const server = http.createServer((req, res) => {
res.writeHead(200, { 'Content-Type': 'text/plain' });
res.setHeader('X-Powered-By', 'Node');
res.end('ok');
});easypromises and async await
Inside the loop, what does `await` do to the timing of this code?
for (const url of urls) {
const res = await fetch(url);
console.log(res.status);
}easyprocess.env variables
What does this snippet print when the environment variable `DEBUG` was never set?
console.log(process.env.DEBUG);easycallbacks error-first
Why does this code crash the process instead of logging the error?
const fs = require('fs');
try {
fs.readFile('nope.txt', (err, data) => {
if (err) throw err;
console.log(data);
});
} catch (e) {
console.log('caught:', e.message);
}easypromises and async await
What does this print?
async function run() {
const r = await [Promise.resolve(1), Promise.resolve(2)][0];
console.log(r);
}
run();easyrequire and module.exports
What does this CommonJS module export?
exports = { a: 1 };
module.exports.b = 2;easycallbacks error-first
What happens when you run this error-first callback code?
const fs = require('fs');
fs.readFile(__filename, 'utf8', (err) => {
if (err) throw err;
console.log('done');
console.log(data);
});mediumWorker threads basics
What does this worker-related snippet log, and why?
const { isMainThread } = require('worker_threads');
console.log(isMainThread);
// run as: node app.jseasycallbacks error-first
What is the problem with this error-first callback usage?
const fs = require('fs');
fs.readFile('config.json', 'utf8', (err, data) => {
console.log(data.length);
if (err) console.log(err);
});Sign in to answer
Everything above is free to read. Answering needs a free account.
We keep the correct answer, the explanation and the scoring behind sign-in so the platform stays honest, which is why the correct option and the worked explanation for every NodeJS question stay behind a free account. Signing in is free and takes a few seconds.
Where NodeJS shows up
API services, BFF layers, build tooling, and serverless functions across most JavaScript-first companies.