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The Event Loop, Visualized
Watch the JS event loop run your code, step by step
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
Hey Product Hunt 👋
The event loop is one of those things every JS developer "knows" until an interviewer asks why a Promise logs before setTimeout(0). [I kept re-learning it from static diagrams and blog posts, and it never fully stuck.]
So we built the thing we wished existed: an animated, steppable event loop where you can paste your own code and watch every callback move between the call stack, Web APIs, and the two queues.
A few things we're proud of:
→ Same animation, three depths. Toggle between a kid-friendly story, a developer's mental model, and the actual HTML spec terms.
→ Step backward, not just forward, so you can rewind to the exact moment something got queued.
→ A microtask starvation scene that shows how endless promises can freeze timers.
Huge credit to Philip Roberts' Loupe, which inspired this years ago.
It's free. We'd love to hear which snippet confused you most, so we can add it as an example!
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About The Event Loop, Visualized on Product Hunt
“Watch the JS event loop run your code, step by step”
The Event Loop, Visualized was submitted on Product Hunt and earned 0 upvotes and 1 comments, placing #115 on the daily leaderboard. 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 was featured in Education (79.3k followers), Software Engineering (43.1k followers) and Developer Tools (520.4k followers) on Product Hunt. Together, these topics include over 128.1k products, making this a competitive space to launch in.
Who hunted The Event Loop, Visualized?
The Event Loop, Visualized was hunted by Sahil Nasariwala. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
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Sahil Nasariwala