Application.kt

package com.mertcb.sskotlin

import io.ktor.application.*
import io.ktor.features.ContentNegotiation
import io.ktor.gson.gson
import io.ktor.http.*
import io.ktor.response.*
import io.ktor.request.*
import io.ktor.routing.*
import java.text.DateFormat

fun main(args: Array<String>): Unit = io.ktor.server.netty.EngineMain.main(args)

@Suppress("unused") // Referenced in application.conf
@kotlin.jvm.JvmOverloads
fun Application.module(testing: Boolean = false) {

    // intalling and configuring GSON
    install(ContentNegotiation) {
        gson {
            setDateFormat(DateFormat.LONG)
            setPrettyPrinting()
        }
    }

    routing {
        get("/"){
            call.respondText("Hello, Kotlin!", ContentType.Application.Json)
        }
        // our post request with endpoint "greet" 
        post("/greet") {
            val postVal: User= call.receive<User>()
            call.respondText("Hello, ${postVal.name}")
        }
    }
}

// our data class to encode given JSON
data class User(val name:String)