The Event Loop, Visualized
Watch the JS event loop run your code, step by step
Details
- External ID
- 1263267
- Source
- PH
- Company
- —
- Product
- The Event Loop, Visualized
- Website domain
- producthunt.com
- Launched
- Sept. 29, 2026
- Cohort
- —
- Upvotes
- 2
- Upvotes percentile
- 0.7405388069275176
- Tags
- Education, Software Engineering, Developer Tools
- Fetched at
- Oct. 1, 2026, 1:01 a.m.
- Updated at
- Oct. 1, 2026, 1:01 a.m.
Description
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
Enrichment
- Theme
- sleep, wake, and clock utilities
- Vertical
- Horizontal
- Function
- Dev tools
- Audience
- Developer
- AI stance
- Not AI
- Project type
- Hobby / open-source project
- Normalized one-liner
- interactive visualizer for the javascript event loop
- Manually corrected
- False
Could you build this?
Partial While simple animations of static code are vibe-codeable, building a true step-by-step debugger and AST interpreter that simulates JavaScript execution (call stack, microtasks, timers) requires deep language runtime internals knowledge.
What it would actually take: The core requires an AST parser (like Babel or Acorn) and a customized JavaScript runtime environment/interpreter (similar to JS-Interpreter) instrumented to record execution ticks, promise resolution states, and task queue shifts. Each step must produce a serializable state snapshot to support bi-directional timeline scrubbing. Mastery of the ECMAScript event loop specification and custom virtual machine execution loops is necessary.
Competitors
Other products that read as similar to this one — 34 launches clear the similarity bar, closest 8 shown.
Attention rank: #11 of 35 (itself plus its competitors, highest first — normalized so YC and Product Hunt are compared fairly).
Launched 284 days after the earliest competitor.
- Code Visualiser · ph · 2026-09-28 · 2 upvotes · similarity 0.53
- An event loop for asyncio written in Rust · hn · 2026-03-21 · 5 upvotes · similarity 0.41
- QuickBEAM · hn · 2026-03-28 · 113 upvotes · similarity 0.39
- Fall asleep by watching JavaScript load · hn · 2026-01-12 · 84 upvotes · similarity 0.38
- next16-airline · github · 2026-09-17 · 9 upvotes · similarity 0.37
- CodeSamjho · ph · 2026-09-30 · 1 upvotes · similarity 0.35
- FastScheduler · hn · 2026-01-13 · 46 upvotes · similarity 0.35
- LazyPromise = Observable · hn · 2025-12-19 · 34 upvotes · similarity 0.35
Other launches for this product
- No other launches for this product.
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