Javalin 1.0 – A Kotlin/Java web framework
Javalin 1.0 – A Kotlin/Java web framework launched on November 7, 2017 with 271 votes, #92 of 3,137 launches that month and more than 99% of that year's launches. The site was still online in September 2026, 8 years on.
In plain words
Javalin is a lightweight web framework for Kotlin and Java developers, inspired by Sparkjava and koa.js. It functions more as a library than a framework, requiring minimal setup and few concepts to learn. Developers can build web applications without extending classes or implementing interfaces, making it accessible for both Kotlin and Java users with a nearly identical experience across both languages.
written from the facts on this page · September 2026
From the sources
Introducing Javalin
Javalin is a very lightweight web framework for Kotlin and Java, inspired by Sparkjava and koa.js . Javalin is written in Kotlin with a few functional interfaces written in Java. This was necessary to provide an enjoyable and near identical experience for both Kotlin and Java developers. Javalin is really more library than framework; you don’t need to extend or implement anything and there are very few “Javalin-concepts” you have to learn. Let’s look at some examples: The interoperability between Kotlin and Java is very important to Javalin. When moving a Javalin project from Java to Kotlin, you shouldn’t need to learn a new way of doing things. In the above examples you can switch between…from javalin.io
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