Ktor Post Json Body, It’s an ideal entry-level tutorial for Kotlin backend developers. Empty So what's the kotlin/ktor Serialize JSON HttpResponse to Kotlin Objects with Ktor. This tutorial covers setup, routing, and testing on a real-life example. This library provides ktor client interface integration for the json-kotlin library. In order to receive custom objects from the payload, you have to use the ContentNegotiation feature. encodeToString(requestBody) to see wether it's the string you expect to send, or just add install(Logging) { level = LogLevel. 2 to support kotlin 1. Ktor is built from the ground up using Kotlin and Coroutines. I am currently writing a test for my API route that registers a user, but I keep encountering an error when I attempt to send a JSON body All functions used to make an HTTP request (request, get, post, etc. how can I do this? I wrote this code but it's not working: override suspend fun Content Negotiation: converts request body based on the content type header. 接收响应的 body 默认情况下，可以使用 HttpResponse 或者 String 作为类型化 HttpClient 请求的类型。例如： With retrofit, you can use response. HttpResponse exposes the API required to get a response body in various ways (raw bytes, JSON objects, etc. The MultiPartFormDataContent constructor also allows you to pass a boundary value. 40), Server (Netty) Describe the bug Making an HTTP POST request without (empty request bodies work fine) a request body crashes content negotiation. dto. The RequestBuilder will be applied last after everything that is set by Ktorfit Annotations Function annotations are available in the request object with their respective values via the annotation extension (HttpRequest. Discover essential code adjustments to handle your POST However, when I use ktor-client to serialize my object, it complains that LoginRequestVo is not serializable. annotations or HttpRequestBuilder. request. You already know how to make simple requests to the server using Ktor Client and get the code and re Learn to build Kotlin RESTful APIs with Ktor. Thankfully, there’s a solution: Serialization. The code snippet below shows how to receive a raw body as a String: If you need to send a file with a form, you can use the following approaches: Use the . Jan 20, 2026 · With the enabled ContentNegotiation plugin, you can send a class instance within a request body as JSON. Recently I had a problem, where I should get the last successful build hash of a Jenkins Job. 2 onwards, this library uses the json-streaming library for on-the-fly JSON parsing. The example below shows an HTTP client POST request with form parameters passed in a body: I want to call an API with the body and send two parameters to this request in the android ktor client. Note that serializers for specific formats require additional artifacts. Ktor (kotlin web framework) has an awesome testable mode where http requests can be wrapped in unit tests. For both approaches, you need to We are sending a post request using Ktor. module like: runBlocking { // Sample for making a HTTP Client request val message = client. serialization: serialize/deserialize JSON (and other formats if needed). To do this, pass a class instance to the setBody() function and set the content type to application/json using the contentType() function: Jan 13, 2021 · The solution is to pass to the HTTP POST request a JSON object not a String object. This tutorial covers:Setting up Ktor dependenciesMaking GET and POST requests with POST, PUT and PATCH POST, PUT and PATCH requests has an associated request body (the payload). This route handles the POST requests received to the path “/products”. Depending upon the query, the response may contain a list of one of two types. i read the ktor documentation mentioned about that Here. In this tutorial, we will explore how to use Ktor Android Client to make all types of HTTP requests including GET, POST, PUT, DELETE, and form submissions. Learn the fundamentals of validation, error handling, and unit testing for services created with Kotlin and Ktor. anyone please help me. though I would have thought specifying url like you do should also work. Customizing requests 我们不能只进行 get 请求，Ktor 允许使用任何 HTTP 动词构件复杂请求，并且灵活地以多种方式处理响应。 Default http methods 与 request 类似，还有几个可以 使用最常见的 HTTP 动词（GET 、 POST 、 PUT 、 DELETE 、 PATCH 、 HEAD 以及 OPTIONS Note that serializers for specific formats require additional artifacts. Once set up, it works automatically without requiring manual intervention. I know that the request body is expected to conform to the request body data class but then, I tested by passing the wrong field in my test payload and it crashed the app.