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.
<ul>
  <li>Lightweight - You don’t have to learn any advanced concepts to get started</li>
  <li>Consistent API - All handlers and mappers are void and operate on the Context (ctx)</li>
  <li>Almost identical API for both Kotlin and Java</li>
  <li>Not opinionated - A library rather than a framework (you never have to extend anything)</li>
  <li>Fully customizable embedded server (Jetty)</li>
  <li>JSON-object-mapping (via Jackson)</li>
  <li>Simple per-endpoint auth via <code class="highlighter-rouge">AccessManager</code> interface</li>
  <li>Simple static file handling</li>
  <li>Lifecycle events</li>
  <li>CookieStore - An easy way to serialize and store objects in cookies</li>
  <li>Template rendering (Velocity, Freemarker, Thymeleaf, Mustache)</li>
  <li>Markdown rendering</li>
</ul>

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 - A Simple REST API Library for Java / Kotlin

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