--- title: JavaScript Visualized: Event Loop | daily.dev description: JavaScript is single-threaded: only one task can run at a time. When we invoke a function, it gets added to something called the call stack. The call stack is... canonical: https://daily.dev/posts/javascript-visualized-event-loop-k-rdpazu9 twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: JavaScript Visualized: Event Loop | daily.dev og:description: JavaScript is single-threaded: only one task can run at a time. When we invoke a function, it gets added to something called the call stack. The call stack is... og:url: https://daily.dev/posts/javascript-visualized-event-loop-k-rdpazu9 og:image: https://api.daily.dev/og/posts/K_rDPAzu9.png og:image:alt: JavaScript Visualized: Event Loop og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # JavaScript Visualized: Event Loop **[Community Picks](https://daily.dev/sources/community)** · 3 min read · 533 upvotes · 13 comments ## Summary JavaScript is single-threaded: only one task can run at a time. When we invoke a function, it gets added to something called the call stack. The call stack is part of the JS engine, this isn't browser specific. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Community discussion Top comments from developers on daily.dev. **@fuadpashayev** · 2 upvotes > Animations are cool, thank you! **@robus** · 2 upvotes > Great Visualization. **@turtonic** · 1 upvotes > Love it, great visuals/gifs! **@hinogi** · 1 upvotes > One of a kind visualizations. all of them **@bytefer** · 1 upvotes > The animation is very vivid, with the help of this animation, Event Loop will not be so difficult to understand. ## Similar posts on daily.dev - [Don’t just attend KubeCon \+ CloudNativeCon, Merge Forward your experience\!](https://daily.dev/posts/don-t-just-attend-kubecon-cloudnativecon-merge-forward-your-experience--l0rpp73x8) · CNCF · 1 upvotes · 0 comments - [Announcing H2 2026 KCDs](https://daily.dev/posts/announcing-h2-2026-kcds-m96goajm1) · CNCF · 1 upvotes · 0 comments - [Two months of Open Community Groups](https://daily.dev/posts/two-months-of-open-community-groups-asf52zhbs) · CNCF · 0 upvotes · 0 comments - [CNCF Unveils Schedule for KubeCon \+ CloudNativeCon Europe 2026](https://daily.dev/posts/cncf-unveils-schedule-for-kubecon-cloudnativecon-europe-2026-ikhcoa5cb) · CNCF · 2 upvotes · 0 comments - [CNCF Debuts KubeCon \+ CloudNativeCon Japan 2026 Schedule](https://daily.dev/posts/cncf-debuts-kubecon-cloudnativecon-japan-2026-schedule-xp5pyudub) · CNCF · 1 upvotes · 0 comments --- Tags: [#javascript](https://daily.dev/tags/javascript) [View this post on daily.dev](https://daily.dev/posts/javascript-visualized-event-loop-k-rdpazu9) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"JavaScript Visualized: Event Loop","url":"https://daily.dev/posts/javascript-visualized-event-loop-k-rdpazu9","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/javascript-visualized-event-loop-k-rdpazu9"},"datePublished":"2022-08-12T14:54:11.874Z","dateModified":"2023-12-07T12:02:45.284Z","description":"JavaScript is single-threaded: only one task can run at a time. 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