When Kotlin was made as a language for the JVM (Java Virtual Machine), one of its main goals was to work well with Java. Kotlin tools have interfaces that use DSL (Domain Specific Language), default and named arguments, and null safety. The Kotlin community grows every year. Here are the top ten Kotlin Libraries and Frameworks for App Development in 2023.
List for best Kotlin Libraries and Frameworks for App Development
- Kotlinx Serialization
- Netflix DGS framework
Details are here for top Kotlin Libraries and Frameworks for App Development
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A Kotlin substitute for Javadoc. It is a reference engine for Kotlin that has nearly 2,000 stars on GitHub. It works on multiple platforms and has a lot of ways to set it up. The language used to describe Kotlin code is called KDoc. Dokka can make documentation in a number of different formats, such as Markdown, Javadoc HTML, and simple HTML. It also comprehends Javadoc and KDoc annotations in Java and Kotlin files, respectively.
Kotlin online projects can use Exposed SQL. Setup and use are simple. An important design rule emphasizes simplicity and minimalism. If you only need to update rows, it’s easy. Deals, isolations, and more can be controlled with the library’s structures. DSL expressions make SQL code more versatile and understandable. The “getting started” guide and paperwork are improving. Transaction separation and thread pools require further investigation. This makes it enjoyable to manipulate.
KMongo is a tool that works with MongoDB the same way that Exposed works with SQL databases. It can handle both synchronous and asynchronous patterns and works with co-routines. It is still fairly new, so not many people use it. This can also be used with serialization in Kotlin to map objects. Because of this, it’s a good choice if you’re not using Spring Boot and your Kotlin app talks to MongoDB. If you don’t use KMongo, you must use the Java driver for MongoDB. In the next example, Kotlin serialization is used to make, save, and get an entity.
Koin is a DI framework written only in Kotlin for Kotlin writers. It is a big help when building a Kotlin game with the libraries listed above. Let’s say you’re working on a Kotlin web app and Ktor is available. You would need a DI system to handle your controllers, services, repositories, etc. At this point, you would need Koin. Before we can start working with Koin, we need to understand a few terms.
Kotest is a testing tool. Every testing tool has three parts: the testing framework, the mocking framework, and the assertion framework. In general, you can use tools like JUnit, Mockk, and assertj together and compare them to each other. Kotest gives you both a framework for testing and a framework for making claims. Kotest was written in Kotlin, which is a good thing. So, it can use the language features of Kotlin, which make it possible to write shorter and more idiomatic statements. It has built-in support for co-routines, the ability to use tools like test lifecycle callbacks, advanced conditional evaluation, powerful data-driven testing, and more.
6. Kotlinx Serialization
When you think of a JSON processor, only Jackson, Gson, or Moshi come to mind. These are also the parsers that Java and spring apps use most often. The Kotlin serialization library from Jet Brains is a reflection-free, cross-platform tool that is geared toward Kotlin.
The Ktor system can be used to build reactive servers and clients based on Kotlin. It is concise and to the point.When you use the system, you can see that this is the case. It is easy, takes little time to set up, and is easy to use. It is much less complicated, but sometimes you have to make more things on your own, which is true of any simple tool with few features. It’s like having a small toolbox with a lot of useful tools. On the other hand, spring is like being alone in a hardware shop.
Mockito is the leading Java mocking library. Mockito may have issues testing Kotlin code. The not Null method cannot use the Kotlin not-null parameter since it returns null and raises an NPE. Mockito does not support further Kotlin language features. Thus, Kotlin-specific libraries are better. Mockk easily handles object mocking, enumerations, extensions, top-level functions, co-routines, nothing, chained calls (including hierarchical patterns), private methods, and constructors.
9. Netflix DGS framework
Netflix launched Netflix DGS to develop GraphQL servers in Kotlin and Java. Open-sourced and ready for production, Netflix has been using it internally. Spring Boot works well with graphql-java-based DGS. Java and Kotlin have examples.
Another web platform that supports Kotlin uses Kotlin DSL. With the Kotlin DSL for Vaadin, you can start adding your information to the UI class right away. With less repetitive text, you can focus on making your project. With traditional Java toolkits like Swing, Vaadin lets you forget about the web and make user interfaces like you would for a desktop game. Kotlin lets you write code that is clear and creative, which makes it a great choice for making online apps.
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