Best Microframeworks for Kotlin

Classes are seldom extended and interfaces are infrequently implemented in Javalin. This framework is built upon Jetty and consists of only a few thousand lines of code, allowing it to match the performance of Jetty's native implementation. Its compact size makes understanding the source code straightforward. Unlike many other Java and Kotlin web frameworks, which typically provide separate versions for each programming language, Javalin has been designed with interoperability in mind, ensuring that applications can be developed similarly in both Java and Kotlin. Running on Jetty, one of the most widely used and reliable web servers available for the JVM, Javalin allows comprehensive configuration of the Jetty server, including support for SSL, HTTP/3, and all the features Jetty provides. While many lightweight web frameworks in Java and Kotlin lack OpenAPI support, Javalin includes this functionality, making it a more versatile option for developers. Consequently, Javalin stands out as a robust choice for building modern web applications efficiently.

Developing asynchronous client and server applications can be a breeze, whether you're working on microservices or cross-platform HTTP client apps, all while keeping it open source, free, and enjoyable! Ktor is uniquely designed from the ground up with Kotlin and Coroutines, enabling you to harness a clear, multiplatform language along with the advantages of asynchronous programming in an easy-to-follow imperative style. With Ktor, you can select only the components you require and arrange your application according to your specific needs. Furthermore, extending Ktor with custom plugins is a straightforward process, allowing for added flexibility. Created by JetBrains, the minds behind IntelliJ IDEA, Kotlin, and other powerful tools, Ktor not only serves a wide array of customers but is also utilized internally within JetBrains itself. Plus, you’ll benefit from exceptional tooling support, making your development experience even more efficient and enjoyable! This combination of features makes Ktor an excellent choice for modern application development.