UPDATE: I got it running! I started from the ktor-...

# ktor

[Stephan Schroeder]

UPDATE: I got it running! I started from the ktor-serialisation example here https://github.com/ktorio/ktor-documentation/tree/main/codeSnippets/snippets/json-kotlinx and introduced my code. I'm not sure what I missed in the first place, but now it runs.

So I'm trying out ktor and something in my setup must be wrong:

fun main() {
    embeddedServer(Netty, port = 8080, host = "localhost") {
        configureRouting()
        configureSerialization()
    }.start(wait = true)
}

fun Application.configureSerialization() {
    install(ContentNegotiation) {
        json(Json {
            prettyPrint = true
            isLenient = true
        })
    }
}
fun Application.configureRouting() {
    routing {
        get("/") {
            call.respondText("Wolt Opening Times Formatter")
        }
        post("/") {
            val data = call.receive<String>()
            call.respondText(data.toString())
        }
    }
}

so the GET works and POSTing a String works as well, but as soon as I try to parse into something more ambicious, this fails, e.g. let's update the POST like this

post("/") {
            val data = call.receive<TestData>()
            call.respondText(data.toString())
        }
    }
}
@kotlinx.serialization.Serializable
data class TestData(
    val monday: Int,
)

then sending over this json

{
  "monday": 12
}

fails with

Cannot transform this request's content to simonvoid.gmx.de.time_formatter.plugins.TestData
io.ktor.features.CannotTransformContentToTypeException: Cannot transform this request's content to simonvoid.gmx.de.time_formatter.plugins.TestData`
...
Caused by: io.ktor.features.CannotTransformContentToTypeException: Cannot transform this request's content to simonvoid.gmx.de.time_formatter.plugins.TestData

it's the same exception when I try to receive into a Map (val data = call.receive<Map<String,Int>>()).

Caused by: io.ktor.features.CannotTransformContentToTypeException: Cannot transform this request's content to kotlin.collections.Map<kotlin.String, kotlin.Int>

[Aleksei Tirman [JB]]

Could you please share request headers? What version of Ktor do you use?

[Stephan Schroeder]

like i added to the update section at the top, i got it working. I'm just not sure which change made it work 😅 But for the future I've got a nice template project now 🙂