Exploring Compose HTML for Server Side Rendering - The JetBrains Blog

Compose HTML is being explored as a potential server-side rendering solution for the JVM, enabling Kotlin developers to create type-safe, reusable HTML components in Compose rather than using string-based templates such as Thymeleaf or JSP. The proposal would add a JVM target and functions that compose an HTML tree once and serialize it to a response string or bytes, supporting conventional server-rendered applications with standard HTTP forms and redirects but initially without browser-side effects, recomposition, or active event listeners. Existing Compose web projects including Kobweb, Kilua, and Summon demonstrate community interest through approaches such as prerendering, SSR, and hydration, while a shared Compose HTML SSR foundation could support future Spring Boot and Ktor integrations. Illustrative API concepts show composable functions serving directly as pages or route handlers, though the author emphasizes that these are speculative examples rather than a roadmap. Longer-term questions include hydration, client-server state synchronization, and shared UI code, while the intended scope is a small core rendering layer whose framework integrations and libraries would be developed by the wider Kotlin ecosystem.

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