JavaScript Quiz
Test your JavaScript from the fundamentals to the tricky bits. This JavaScript quiz covers types, scope, closures, async, and the gotchas that trip up even experienced devs — great for interview prep or a coding battle with friends.
▶ Play the JavaScript QuizWhat you'll be tested on
- Types, coercion, and equality
- Scope, hoisting, and closures
- Promises and async/await
- Arrays, objects, and the DOM
How it works
1. Pick your mode. Play solo to learn at your own pace, or host a room and battle friends live.
2. Answer timed questions. Fresh AI-generated questions every round — no two games are the same.
3. Climb the leaderboard. Track streaks, XP and accuracy as you master JavaScript.
Frequently asked questions
Is the JavaScript quiz good for interview prep?
Yes — questions focus on applied understanding and common edge cases, which is exactly what technical interviews probe.
Can I generate a harder JavaScript quiz?
Pick the Deep difficulty and JBattle's AI writes advanced, edge-case-heavy questions on the spot.
Is JBattle free?
Yes. Playing quizzes, hosting rooms, and challenging friends on JBattle is completely free and runs in your browser — no download needed.