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For Kotlin, Ktor<\/strong> is a lightweight and adaptable web framework that may be used to create high-performing, scalable web applications. Its extensibility and simplicity of usage, which enable developers to develop and launch applications fast with a clear and simple syntax, are the main reasons for its appeal. A wide range of capabilities are also available with Ktor, including as support for HTTP clients and servers, routing, templating, and asynchronous programming. Moreover, a lot of Kotlin developers prefer Ktor because of its versatility in working with various platforms and contexts, including cloud and Android environments.<\/p>\n This blog will teach you the fundamentals of Ktor<\/strong> and show you how to use it to build a basic backend application.<\/p>\n \u25cf Developed by JetBrains<\/strong>, Ktor<\/strong> is an open-source framework for creating asynchronous servers and clients with the Kotlin programming language.<\/p>\n \u25cf Because it provides a flexible and lightweight method of developing web applications with an emphasis on modularization and extensibility, Ktor has gained popularity. With Kotlin’s succinct syntax and functional programming features, developers can create web applications quickly and effortlessly. Because of its extremely scalable and performant design, it may be used to create online applications with heavy traffic. It can run on conventional servers, containerized environments, and serverless platforms like AWS Lambda, among other deployment possibilities.<\/p>\n \u25cf Kotlin and Coroutines:\u00a0 <\/b>Building web applications using Kotlin and Coroutines in Ktor offers a contemporary and effective approach. Building and maintaining code using Kotlin’s expressive syntax with Java interoperability is simpler, and writing asynchronous code with Coroutines is scalable and efficient.<\/p>\n \u25cf Lightweight and Flexible: <\/b>Ktor is constructed from a collection of compact, targeted libraries that can be used separately or in combination based on the project’s requirements. It uses Kotlin’s robust features, such as DSLs (domain-specific languages) and extension functions, to offer a clear and expressive syntax that lets programmers flexibly organize their applications.<\/p>\n \u25cf Interoperable: <\/b>As Ktor is based on Kotlin, it is quite compatible with Java. Ktor’s ease of integration with pre-existing Java code and libraries allows developers to use the framework with other Java-based frameworks like Springboot or in their current Java projects.<\/p>\n \u25cf Migration: <\/b>Because Kotlin supports progressive migration, it makes it possible for big codebases to migrate smoothly from Java to Kotlin. Kotlin allows developers to write new code while keeping existing Java components of their system intact.<\/p>\n \u25cf Tooling support: <\/b>Developers can create, maintain, and deploy Ktor applications with ease using their favorite tools and workflows thanks to Ktor’s robust tooling support. Specifically, the tight interaction with IntelliJ IDEA offers Ktor users a seamless and effective development experience.<\/p>\n \u25cf Community support: <\/strong>The Ktor community is committed to assisting developers in becoming familiar with and proficient users of the framework. It is robust and encouraging. Apart from the official documentation, the Ktor community provides assistance via other platforms like StackOverflow, Reddit, and GitHub.<\/p>\n In order to develop rest API using ktor, we need to have basic knowledge of Kotlin’s programming language and its syntax.<\/span><\/p>\n We need to use the following tools in order to develop this project<\/span><\/p>\n Depending on the specifications, several methods exist to begin your Ktor projects. You can make a Ktor project with IntelliJ IDEA Ultimate. Use the community edition, which allows you to create a Ktor project using a web-based project generator, if you’re interested in open-source development. Additionally, you can use start.ktor.io to create a new Ktor application and use IntelliJ IDEA to provide the necessary features.<\/p>\n In this section, we will create a project using the Ktor Project Generator web tool.<\/p>\n \u25cf <\/b>Use your browser to open the https:\/\/start.ktor.io\/<\/strong> URL.<\/p>\n \u25cf <\/b>Give the project a legitimate name, such as ktor-sample<\/strong>.<\/p>\n \u25cf <\/b>By selecting the “adjust project settings<\/strong>” link, the user can view the project configurations as they are by default.<\/p>\n \u25cf <\/b>In this demo, the default project configurations will be used.<\/span><\/p>\n \u25cf <\/b>Click the Add Plugins buttons to add features such as Content Negotiation<\/strong>, kotlinx.serialization<\/strong><\/span>, <\/b>Default Headers,<\/strong> and Routing<\/strong>.<\/span><\/p>\n \u25cf kotlinx.serialization<\/b>: ContentNegotiation<\/strong> allows the users to use content converters provided by the kotlinx.serialization library. This library supports JSON<\/strong>, CBOR<\/strong>, ProtoBuf<\/strong>, and other formats.<\/span><\/p>\n Routing<\/b>: Routing is a plugin that is installed into an application to simplify and structure the page request handling. It provides a structured way to handle incoming HTTP requests and generate corresponding responses. With Ktor routing, developers can define routes that match specific request URLs and methods and then handle these requests with custom logic.<\/span><\/p>\n Click on Generate Project to generate the Ktor project.<\/span><\/p>\n \u25cf <\/b>Download and extract the [project-name].zip (Eg: ktor-sample.zip<\/strong>) file.<\/span><\/p>\n \u25cf <\/b>Open it in IntelliJ IDEA<\/strong> community edition and wait for the Gradle sync completion.<\/span><\/p>\n \u25cf <\/b>Click on the play icon (\u25b6\ufe0f) to run the ktor server<\/strong>.<\/span><\/p>\n The Run window shows a message like \u201cResponding at <\/span>http:\/\/127.0.0.1:8080<\/span><\/a>\u201d if the server is running successfully.<\/span><\/p>\n The \u201cHello World!<\/strong>\u201d message will be shown if you hit the <\/span>http:\/\/127.0.0.1:8080<\/span><\/a> URL on the browser.<\/span><\/p>\n A Ktor application’s project structure is quite adaptable and may be changed to suit the requirements of the developer. However, a Ktor project structure will typically contain the following common elements:<\/p>\n Additionally, a Ktor project may include other directories or files based on the user requirements, such as a database directory, custom libraries or modules, or additional configuration files.<\/span><\/p>\n This part will cover creating a custom Ktor application that provides the user with user information. To continue creating the application, we will use the beginning code (above), which was produced using the Ktor generator. The IntelliJ IDEA Ultimate IDE or the ktor generator can be used to create new applications if that’s your thing.<\/p>\n When the Gradle sync is finished, open the downloaded project in the IntelliJ IDEA community edition.<\/p>\n By right-clicking on the com.example directory, choosing New \u2192 Package, and entering a legitimate name named models, you can create a package called com.example.models. In this section, we will use a Mutable list-type<\/strong>\u00a0structure for adding users and simulating the data without using any databases.<\/p>\n We created a basic get\/post request in the previous section. We will build a service and route that preloads user’s data in this section.<\/p>\n First, leave a remark as follows on the lines you added to the Serialization.kt<\/strong> file.<\/p>\n Add a new Kotlin class or file called UserService.kt.<\/strong>\u00a0 Add the code that follows.<\/p>\n Open the Routing.kt<\/strong> file and add the following code to it.<\/p>\n We can now use the get, post, and delete routes to test the app. To start the application and test the URLs using Postman, choose the Application.kt<\/strong> file and click the play button (\u25b6\ufe0f).<\/p>\n https:\/\/codemaker2016.medium.com\/introduction-to-ktor-6e238fa20c3<\/span><\/a><\/p>\nWhat is Ktor?<\/h2>\n
Why do we need Ktor?<\/h2>\n
Prerequisites & Tools used to develop rest API<\/b><\/h2>\n
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Creating a Ktor application<\/h2>\n
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<\/h2>\nUnderstanding the Project Structure<\/b><\/h2>\n
![\"\"](\"\/blog\/wp-ttn-blog\/uploads\/2024\/02\/Screenshot-2023-08-26-112725.png\")
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Create your first Ktor application<\/b><\/h2>\n
\nMake your own paths for adding, removing, and creating users. Make a model of the user that includes the author, title, ID, and publications. For this, choose New \u2192 Kotlin by right-clicking the models folder.<\/p>\n![\"\"](\"\/blog\/wp-ttn-blog\/uploads\/2024\/02\/carbon-4-1024x839.png\")
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\nTo create a new user, add a new endpoint as a post request to the Serialization.kt<\/b>\u00a0file. Add the following code to it.<\/li>\n<\/ul>\n![\"\"](\"\/blog\/wp-ttn-blog\/uploads\/2024\/02\/carbon-2-1-866x1024.png\")
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\nOpen the Serialization.kt <\/b>file, add a new endpoint as a get request to retrieve all users. Follow the below code,<\/li>\n<\/ul>\n![\"\"](\"\/blog\/wp-ttn-blog\/uploads\/2024\/02\/carbon-3-1-804x1024.png\")
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Creating service and routing<\/h2>\n
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<\/p>\nCreate the service<\/strong><\/h2>\n
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<\/p>\nCreate the route<\/strong><\/h2>\n
![\"\"](\"\/blog\/wp-ttn-blog\/uploads\/2024\/02\/carbon-7-1-789x1024.png\")
<\/p>\nAdd the route<\/strong><\/h2>\n
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<\/p>\nTest the app<\/h3>\n
Reference<\/b><\/h2>\n