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The Event Loop, Visualized

The Event Loop, Visualized

Watch the JS event loop run your code, step by step

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Most event loop explainers are static diagrams. This one runs. Watch the call stack, Web APIs, microtask queue and task queue animate your code tick by tick: forward, backward, at any speed. - Paste your own snippet (setTimeout, promises, async/await, queueMicrotask) and simulate it - One animation, three explanations: simple, developer, or straight from the HTML spec - Ready-made scenes like Promise vs setTimeout and microtask starvation - Interview questions to test yourself

The Event Loop, Visualized makers

Here are the founders, developers, designers and product people who worked on The Event Loop, Visualized

Sahil Nasariwala@sahilnasariwala
The Event Loop, VisualizedThe Event Loop, Visualized