--- title: Understanding CORS | daily.dev description: A post explaining CORS (Cross-Origin Resource Sharing) and its relevance in web development. It covers real-life examples, CSRF attacks, and provides code... canonical: https://daily.dev/posts/understanding-cors-ryam4iljr twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Understanding CORS | daily.dev og:description: A post explaining CORS (Cross-Origin Resource Sharing) and its relevance in web development. It covers real-life examples, CSRF attacks, and provides code... og:url: https://daily.dev/posts/understanding-cors-ryam4iljr og:image: https://api.daily.dev/og/posts/RyAM4iLJR.png og:image:alt: Understanding CORS 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 CORS **[ITNEXT](https://daily.dev/sources/itnext)** · 18 min read · 291 upvotes · 17 comments ## Summary A post explaining CORS (Cross-Origin Resource Sharing) and its relevance in web development. It covers real-life examples, CSRF attacks, and provides code samples for implementing CORS in a backend API and frontend application. ## 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. **@lvasquez** · 10 upvotes > it requires some talent to explain stuff like this without making you feel like a stupid 5 y/o 👏👏👏 **@sshiv6353** · 3 upvotes > Really well explained! **@grbit** · 1 upvotes > Nice section with CSRF **@rakib8680** · 1 upvotes > amazing explanation **@propianist1124** · 1 upvotes > pretty good stuff ## 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: [#frontend](https://daily.dev/tags/frontend), [#security](https://daily.dev/tags/security), [#webdev](https://daily.dev/tags/webdev) [View this post on daily.dev](https://daily.dev/posts/understanding-cors-ryam4iljr) ```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 CORS","url":"https://daily.dev/posts/understanding-cors-ryam4iljr","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/understanding-cors-ryam4iljr"},"datePublished":"2024-01-03T19:07:30.305Z","dateModified":"2024-08-30T02:21:21.673Z","description":"A post explaining CORS (Cross-Origin Resource Sharing) and its relevance in web development. It covers real-life examples, CSRF attacks, and provides code...","image":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/f953d8bff1f7397ee1560d066ab2809f?_a=AQAEufR","thumbnailUrl":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/f953d8bff1f7397ee1560d066ab2809f?_a=AQAEufR","isAccessibleForFree":true,"articleSection":"ITNEXT","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"ITNEXT","logo":"https://media.daily.dev/image/upload/t_logo,f_auto/v1/logos/itnext2","url":"https://daily.dev/sources/itnext"},"commentCount":17,"discussionUrl":"https://daily.dev/posts/understanding-cors-ryam4iljr","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":291},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":17}],"keywords":"frontend,security,webdev","timeRequired":"PT18M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"ITNEXT","item":"https://daily.dev/sources/itnext"},{"@type":"ListItem","position":3,"name":"Understanding CORS"}]} {"@context":"https://schema.org","@type":"WebPage","@id":"https://daily.dev/posts/understanding-cors-ryam4iljr","comment":[{"@type":"Comment","text":"it requires some talent to explain stuff like this without making you feel like a stupid 5 y/o 👏👏👏","datePublished":"2024-01-05T10:13:43.879Z","url":"https://daily.dev/posts/RyAM4iLJR#c-3GG2HmrX1","author":{"@type":"Person","name":"Loreto Vásquez","url":"https://daily.dev/lvasquez","image":"https://media.daily.dev/image/upload/s--ro6oLKnU--/f_auto,q_auto/v1/avatars/avatar_tExFwHi3rHb2r08ceqOQy"},"interactionStatistic":{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":10}},{"@type":"Comment","text":"Really well explained!","datePublished":"2024-01-08T07:27:09.241Z","url":"https://daily.dev/posts/RyAM4iLJR#c-NLciEzjpc","author":{"@type":"Person","name":"Shivlal Sharma","url":"https://daily.dev/sshiv6353","image":"https://avatars.githubusercontent.com/u/40575397?v=4"},"interactionStatistic":{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":3}},{"@type":"Comment","text":"Nice section with CSRF","datePublished":"2024-01-10T15:21:10.329Z","url":"https://daily.dev/posts/RyAM4iLJR#c-1o7915qa7","author":{"@type":"Person","name":"grbit","url":"https://daily.dev/grbit","image":"https://avatars.githubusercontent.com/u/6090120?v=4"},"interactionStatistic":{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":1}},{"@type":"Comment","text":"amazing explanation","datePublished":"2024-01-20T10:43:20.978Z","url":"https://daily.dev/posts/RyAM4iLJR#c-CbYBjvB5A","author":{"@type":"Person","name":"Abdullah Al Rakib","url":"https://daily.dev/rakib8680","image":"https://avatars.githubusercontent.com/u/121743420?v=4"},"interactionStatistic":{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":1}},{"@type":"Comment","text":"pretty good stuff","datePublished":"2024-01-22T02:06:37.579Z","url":"https://daily.dev/posts/RyAM4iLJR#c-rMmIdkyR2","author":{"@type":"Person","name":"proPianist1124","url":"https://daily.dev/propianist1124","image":"https://media.daily.dev/image/upload/s--uQrY4JYV--/f_auto/v1705860149/avatars/avatar_5VNxZYvk0kXBQECnZHPQ1"},"interactionStatistic":{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":1}}]} ```