Each round gives you 10 randomly selected questions from a pool of 50 across JavaScript, TypeScript, CSS, Git, and Web fundamentals. Click the answer you think is correct — correct answers pop green, wrong answers shake red. An explanation appears below each question so you learn the why, not just the what. Click 'Next Question' to continue. Your streak counter rewards consecutive correct answers.
Code Quiz is completely free — no account, no email, no credit card. Runs entirely in your browser. Built by Software That Benefits, a studio dedicated to free tools and games for developers.
The quiz covers JavaScript quirks and fundamentals (typeof, closures, async/await, equality), TypeScript (types, enums, optional chaining), CSS concepts (units, z-index, flexbox), Git commands (stash, rebase, cherry-pick), and general web knowledge (HTTP status codes, CORS, localStorage).
Yes — many questions are based on common JavaScript interview topics including type coercion, floating point behavior, closure scoping, and Promise behavior. The explanations are written to help you understand the 'why', not just memorize the answer.
No — each round randomly selects 10 questions from the full pool of 50 and shuffles their order, so every playthrough feels different.
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