--- title: Ktor 3.0 Released With Enhanced IO, Kotlin 2.0... description: Ktor 3.0 has been released, featuring integration with Kotlin 2.0, migration to `kotlinx.io` for improved IO performance, support for server-sent events (SSE),... canonical: https://daily.dev/posts/ktor-3-0-released-with-enhanced-io-kotlin-2-0-integration-and-real-time-features-dutvm6e0t twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Ktor 3.0 Released With Enhanced IO, Kotlin 2.0 Integration, and Real-Time Features | daily.dev og:description: Ktor 3.0 has been released, featuring integration with Kotlin 2.0, migration to `kotlinx.io` for improved IO performance, support for server-sent events (SSE),... og:url: https://daily.dev/posts/ktor-3-0-released-with-enhanced-io-kotlin-2-0-integration-and-real-time-features-dutvm6e0t og:image: https://api.daily.dev/og/posts/dUtvM6E0T.png og:image:alt: Ktor 3.0 Released With Enhanced IO, Kotlin 2.0 Integration, and Real-Time Features 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. # Ktor 3.0 Released With Enhanced IO, Kotlin 2.0 Integration, and Real-Time Features **[Collections](https://daily.dev/sources/collections)** · 2 min read · 1 upvotes · 0 comments ## Summary Ktor 3.0 has been released, featuring integration with Kotlin 2.0, migration to `kotlinx.io` for improved IO performance, support for server-sent events (SSE), and new functionalities like WebAssembly build target and `staticZip` for serving static resources. Enhanced security through CSRF protection and various plugin updates also mark this release. Developers are advised to review the migration guide due to several breaking changes, especially in low-level IO APIs. ## Content # Ktor 3.0 Released with Kotlin 2.0, Enhanced IO, and Real-Time Features Ktor 3.0, the latest version of the Kotlin-based framework for building asynchronous applications, has been officially released. This milestone integrates Kotlin 2.0 and transitions to the `kotlinx.io` library for improved standardized IO functionality and performance. Here’s a detailed look at the new features and updates: ## Key Features and Improvements ### Migration to `kotlinx.io` One of the significant changes in Ktor 3.0 is the migration to the `kotlinx.io` library. This switch provides a unified approach to handling data sources and promises better performance due to optimized byte handling and IO operations. ### Server-Sent Events (SSE) Support Ktor 3.0 introduces preliminary support for server-sent events (SSE), allowing the server to push real-time updates to the client over a single HTTP connection. This feature is particularly useful for applications requiring live updates, such as dashboards and notifications. ### WebAssembly (Wasm) as a Build Target The Ktor client now supports WebAssembly (Wasm) as a new build target. This addition broadens Ktor's multiplatform capabilities, enabling developers to write client code that can run in web browsers with near-native performance. ### StaticZip Function Another new feature is the `staticZip` function, which simplifies serving static resources directly from ZIP archives. This can help improve resource management and deployment efficiency. ### CSRF Protection To enhance security, Ktor 3.0 adds support for Cross-Site Request Forgery (CSRF) protection. This feature helps safeguard your applications from CSRF attacks, a common web security vulnerability. ## Breaking Changes Several breaking changes have been introduced, particularly affecting low-level IO APIs. Developers are encouraged to review the migration guide provided by the Ktor team to ease the transition from earlier versions and to ensure compatibility. ## Additional Updates - **Kotlin 2.0 Integration:** Ktor 3.0 is now fully compatible with Kotlin 2.0, bringing the latest language features and enhancements to your projects. - **Plugin Updates:** Various plugin updates have been made to ensure better functionality and compatibility. - **TestApplication Class Modifications:** Changes to the TestApplication class have been implemented for more robust testing capabilities. Ktor 3.0 is a significant step forward, providing better performance, enhanced security, and new features for real-time applications. Developers are encouraged to upgrade to take advantage of these improvements and to consult the migration guide for a smooth transition. ## 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: [#kotlin](https://daily.dev/tags/kotlin), [#webassembly](https://daily.dev/tags/webassembly), [#web-security](https://daily.dev/tags/web-security), [#ktor](https://daily.dev/tags/ktor) [View this post on daily.dev](https://daily.dev/posts/ktor-3-0-released-with-enhanced-io-kotlin-2-0-integration-and-real-time-features-dutvm6e0t) ```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":"Ktor 3.0 Released With Enhanced IO, Kotlin 2.0 Integration, and Real-Time Features","url":"https://daily.dev/posts/ktor-3-0-released-with-enhanced-io-kotlin-2-0-integration-and-real-time-features-dutvm6e0t","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/ktor-3-0-released-with-enhanced-io-kotlin-2-0-integration-and-real-time-features-dutvm6e0t"},"datePublished":"2024-10-11T17:36:52.185Z","dateModified":"2024-10-11T22:38:29.624Z","description":"Ktor 3.0 has been released, featuring integration with Kotlin 2.0, migration to `kotlinx.io` for improved IO performance, support for server-sent events (SSE),...","image":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/4c06e49b659a774468ac8e968a831888?_a=AQAEuiZ","thumbnailUrl":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/4c06e49b659a774468ac8e968a831888?_a=AQAEuiZ","isAccessibleForFree":true,"articleSection":"Collections","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":"Collections","logo":"https://media.daily.dev/image/upload/s--fk_6ycEi--/f_auto,q_auto/v1780996001/logos/collections?_a=BAMAMiWQ0","url":"https://daily.dev/sources/collections"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/ktor-3-0-released-with-enhanced-io-kotlin-2-0-integration-and-real-time-features-dutvm6e0t","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":1},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"kotlin,webassembly,web-security,ktor","timeRequired":"PT2M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"Collections","item":"https://daily.dev/sources/collections"},{"@type":"ListItem","position":3,"name":"Ktor 3.0 Released With Enhanced IO, Kotlin 2.0 Integration, and Real-Time Features"}]} ```