Stack Quiz

Pick a topic, review the concepts in Learn mode, or go straight to Play and test yourself under the clock.

New questions added every week — keep coming back to stay sharp.

180 Qs

JavaScript

Core JS: closures, async/await, prototypes, event loop, and ES6+.

100 Qs

MongoDB

Documents, queries, aggregation pipelines, indexes, and schema design.

node
100 Qs

Node.js

Event-driven I/O, streams, modules, Express patterns, and the Node runtime.

100 Qs

React

Hooks, component lifecycle, state management, and rendering patterns.

How it works

Two ways to study

📖

Learn Mode

No pressure. Go through each question at your own pace, read the explanation, and navigate freely. Perfect before an interview when you want to solidify concepts.

  • ✓ No timer
  • ✓ Full explanations
  • ✓ Back-and-forth navigation
⚡

Play Mode

Race against the clock. A 20-minute countdown starts the moment you pick an answer. Right answers add +5s, wrong ones cost −10s. Questions auto-advance - no clicking needed.

  • ✓ 20-minute countdown
  • ✓ Time bonuses & penalties
  • ✓ Auto-advances between questions

Topics covered

React100 questions
JavaScript180 questions
nodeNode.js100 questions
MongoDB100 questions

TypeScript · Next.js · SQL · System Design - coming soon

FAQ

Frequently asked questions

Do I need an account?

No. Stack Quiz is 100% free with no sign-up required. Pick a topic and start immediately.

How does Play mode work?

You get a 20-minute countdown. Correct answers add +5 seconds, wrong answers deduct −10 seconds. Questions auto-advance. The game ends at zero or when all questions are answered.

What is Learn mode?

Learn mode has no timer. Read each question, pick an answer, and study the explanation at your own pace - ideal for revision before an interview.

Can I turn off the timer?

Yes. Click the 'Timer On' pill in the top bar before your first answer to remove the countdown for that session.

Which topics are available?

React, JavaScript, Node.js, and MongoDB. TypeScript, Next.js, SQL, and System Design quizzes are coming soon.

Are the questions interview-relevant?

Every question is written to reflect real interview patterns - covering concepts that senior engineers are regularly tested on.