Best Development Frameworks for Kotlin

Based on architectural principles, such as Domain-Driven Design (DDD) and Command-Query Responsibility Segregation (CQRS), the Axon Framework provides the building blocks that CQRS requires and helps create scalable and extensible applications while maintaining application consistency in distributed systems.

Vert.x enables handling a greater number of requests using fewer resources than traditional stacks and frameworks that rely on blocking I/O. It is well-suited for a variety of execution environments, including those with limitations such as virtual machines and containers. Have you heard that asynchronous programming can be daunting? We aim to make working with Vert.x a more accessible endeavor, ensuring that you don't compromise on accuracy or performance. By utilizing Vert.x, you can enhance deployment density and reduce costs instead of wasting resources. You can choose from various models that best suit your project's needs, including callbacks, promises, futures, reactive extensions, and (Kotlin) coroutines. Unlike a conventional framework, Vert.x operates as a toolkit, making it inherently composable and embeddable. We believe in giving you the freedom to design your application structure as you see fit. You can select the necessary modules and clients, seamlessly integrating them to build the application you envision. This flexibility allows developers to tailor solutions that perfectly align with their unique requirements.

Koin streamlines dependency injection (DI) and enhances the experience for developers working within the Kotlin ecosystem. It enables the creation of various applications, spanning from Android mobile to backend Ktor server implementations. Designed to meet the needs of even the most challenging applications, Koin has earned the trust of developers globally. As an open-source framework specifically crafted for Kotlin, Koin features an intuitive domain-specific language (DSL) and a lightweight container that simplifies dependency management for any Kotlin application or SDK. With Koin, developers can effortlessly set up their dependency injection through its straightforward API and Kotlin DSL, allowing them to concentrate on developing complex Android mobile applications rather than getting bogged down by their tools. This framework integrates seamlessly with the broader Kotlin ecosystem, leveraging Kotlin's capabilities to facilitate easy dependency injection across multiple platforms. Already adopted by thousands of companies worldwide, Koin is well-equipped to handle scaling in production environments while continuing to evolve with developer needs. By providing a user-friendly approach to dependency injection, Koin empowers developers to innovate and deliver high-quality applications efficiently.

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.