--- title: WASI 0.3 Launched | daily.dev description: WASI 0.3.0 has been officially ratified by the WASI Subgroup, bringing native async support to WebAssembly Components via the Component Model's canonical ABI.... canonical: https://daily.dev/posts/wasi-0-3-launched-go9euqwpf twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: WASI 0.3 Launched | daily.dev og:description: WASI 0.3.0 has been officially ratified by the WASI Subgroup, bringing native async support to WebAssembly Components via the Component Model's canonical ABI.... og:url: https://daily.dev/posts/wasi-0-3-launched-go9euqwpf og:image: https://api.daily.dev/og/posts/Go9EUQWpf.png og:image:alt: WASI 0.3 Launched 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. # WASI 0.3 Launched **[Lobsters](https://daily.dev/sources/lobsters)** · 8 min read · 0 upvotes · 0 comments ## Summary WASI 0.3.0 has been officially ratified by the WASI Subgroup, bringing native async support to WebAssembly Components via the Component Model's canonical ABI. The key change is that async primitives — stream, future, and async functions — are now first-class constructs in the canonical ABI, replacing the cumbersome wasi:io pollable/input-stream/output-stream workarounds from WASI 0.2. The host now manages a single shared event loop across all components, enabling component composition with async interop. The async model is completion-based (similar to io_uring/IOCP), and binding generators for Rust, Go, Python, JavaScript, C#, and C can now emit idiomatic async bindings. wasi:http has been reorganized into service and middleware worlds, enabling service chaining where composed components communicate in nanoseconds instead of milliseconds. Wasmtime 46 will ship WASI 0.3.0 with Component Model Async enabled by default, and jco support is also imminent. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: --- Tags: [#webdev](https://daily.dev/tags/webdev), [#webassembly](https://daily.dev/tags/webassembly) [View this post on daily.dev](https://daily.dev/posts/wasi-0-3-launched-go9euqwpf) ```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":"WASI 0.3 Launched","url":"https://daily.dev/posts/wasi-0-3-launched-go9euqwpf","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/wasi-0-3-launched-go9euqwpf"},"datePublished":"2026-06-16T13:09:43.068Z","dateModified":"2026-06-16T13:11:53.314Z","description":"WASI 0.3.0 has been officially ratified by the WASI Subgroup, bringing native async support to WebAssembly Components via the Component Model's canonical ABI....","image":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/972b59951fcfdd82f72ead3571182d26?_a=AQAEuop","thumbnailUrl":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/972b59951fcfdd82f72ead3571182d26?_a=AQAEuop","isAccessibleForFree":true,"articleSection":"Lobsters","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":"Lobsters","logo":"https://media.daily.dev/image/upload/s--tl8v_Fku--/f_auto,t_logo/v1698841318/logos/lobste.jpg","url":"https://daily.dev/sources/lobsters"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/wasi-0-3-launched-go9euqwpf","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":0},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"webdev,webassembly","timeRequired":"PT8M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"Lobsters","item":"https://daily.dev/sources/lobsters"},{"@type":"ListItem","position":3,"name":"WASI 0.3 Launched"}]} ```