Developer launches daily JavaScript puzzle game that auto-validates every answer

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A developer has built 'What's the Output?', a free daily JavaScript puzzle game available at whatstheoutput.online. Each puzzle presents a code snippet and challenges players to predict its console output, with a new puzzle releasing every day at 00:00 UTC. Every snippet is executed in real Node.js as part of an automated test suite, ensuring no incorrect or unwinnable puzzles can go live. The system also lints hints to prevent them from inadvertently revealing answers, a flaw discovered during development. Built with Next.js ISR, the project aims to highlight the gap between what developers think JavaScript does and what it actually outputs.

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