--- title: Understanding JavaScript Promises | daily.dev description: This post explains the concept of JavaScript Promises and how to use them. It covers the three states of a Promise and demonstrates how to chain Promises. It... canonical: https://daily.dev/posts/understanding-javascript-promises-wmkj57znr twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Understanding JavaScript Promises | daily.dev og:description: This post explains the concept of JavaScript Promises and how to use them. It covers the three states of a Promise and demonstrates how to chain Promises. It... og:url: https://daily.dev/posts/understanding-javascript-promises-wmkj57znr og:image: https://api.daily.dev/og/posts/WMkJ57Znr.png og:image:alt: Understanding JavaScript Promises 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. # Understanding JavaScript Promises **[Community Picks](https://daily.dev/sources/community)** · 8 min read · 163 upvotes · 7 comments ## Summary This post explains the concept of JavaScript Promises and how to use them. It covers the three states of a Promise and demonstrates how to chain Promises. It also compares Promises to other asynchronous techniques like callbacks and Observables. ## 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. **@emmaraypromise** · 4 upvotes > Very informative...never really used promises, now that I get them, definitely. **@robertoumbelino** · 2 upvotes > Great article, with a lot of information. Understanding and using promises is very important in the JavaScript ecosystem. **@evandowsett** · 1 upvotes > This is so helpful, thanks so much! I've worked a lot with JS but have never really taken the time to fully understand Promises. Very interesting :) **@junaidnoob** · 1 upvotes > Very informative 👍 **@danclarke** · 1 upvotes > Love learning new concepts with analogies like the one explained in this article. Thanks for sharing! ## 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 --- Tags: [#javascript](https://daily.dev/tags/javascript) [View this post on daily.dev](https://daily.dev/posts/understanding-javascript-promises-wmkj57znr) ```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":"Understanding JavaScript Promises","url":"https://daily.dev/posts/understanding-javascript-promises-wmkj57znr","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/understanding-javascript-promises-wmkj57znr"},"datePublished":"2024-05-17T07:28:34.136Z","dateModified":"2024-05-17T07:28:33.244Z","description":"This post explains the concept of JavaScript Promises and how to use them. 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Understanding and using promises is very important in the JavaScript ecosystem.","datePublished":"2024-05-17T14:01:23.365Z","url":"https://daily.dev/posts/WMkJ57Znr#c-l42caDDkm","author":{"@type":"Person","name":"Roberto Umbelino","url":"https://daily.dev/robertoumbelino","image":"https://avatars.githubusercontent.com/u/17939056?v=4"},"interactionStatistic":{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":2}},{"@type":"Comment","text":"This is so helpful, thanks so much! I’ve worked a lot with JS but have never really taken the time to fully understand Promises. Very interesting :)","datePublished":"2024-05-25T04:05:36.577Z","url":"https://daily.dev/posts/WMkJ57Znr#c-FfGaFpYk9","author":{"@type":"Person","name":"Evan","url":"https://daily.dev/evandowsett","image":"https://media.daily.dev/image/upload/s--OIlc5zMd--/f_auto/v1716992042/avatars/avatar_GElCFLtSaX3sK56JjUZwD"},"interactionStatistic":{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":1}},{"@type":"Comment","text":"Very informative 👍","datePublished":"2024-05-23T09:38:56.947Z","url":"https://daily.dev/posts/WMkJ57Znr#c-gXQY2JDuZ","author":{"@type":"Person","name":"Junaid","url":"https://daily.dev/junaidnoob","image":"https://lh3.googleusercontent.com/a/ACg8ocKWuA7-g_5lREecDT8K8V85ck5L-ZmB7cxW9652CuzGjYQEmhwD=s96-c"},"interactionStatistic":{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":1}},{"@type":"Comment","text":"Love learning new concepts with analogies like the one explained in this article. Thanks for sharing!","datePublished":"2024-05-24T14:28:13.187Z","url":"https://daily.dev/posts/WMkJ57Znr#c-EhqvJoZb9","author":{"@type":"Person","name":"Dan","url":"https://daily.dev/danclarke","image":"https://avatars.githubusercontent.com/u/97691636?v=4"},"interactionStatistic":{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":1}}]} ```