Ktor Hello World Example

In the section, we will create a project for Hello Word Example.

Step 1: Open Ktor Initializr https://start.ktor.io/

Step 2: Provide the Project Name We have provided ktor-helloworld.

Step 3: Provide the Website name. We have provided the com.knf.dev.

Step 4: Provide the Artifact Id. We have provided the dev.knf.com.ktor-helloworld.

Step 5: Click on the Add plugins button.

Step 6: Click on the Generate project button. 

Step 7: Extract the ZIP file.

Step 8: Import the project folder

When the project imports successfully, it shows the following project directory in the Package Explorer section of the IDE.

Project Directory

Routing.kt

package dev.com.knf.plugins

import io.ktor.server.routing.*
import io.ktor.http.*
import io.ktor.server.application.*
import io.ktor.server.response.*
import io.ktor.server.request.*

fun Application.configureRouting() {

    routing {
        get("/") {
            call.respondText("Hello World!")
        }
    }
}

Application.kt

package dev.com.knf

import io.ktor.server.application.*
import io.ktor.server.engine.*
import io.ktor.server.netty.*
import dev.com.knf.plugins.*

fun main() {
    embeddedServer(Netty, port = 8080, host = "0.0.0.0", module = Application::module)
        .start(wait = true)
}

fun Application.module() {
    configureRouting()
}

When the application runs successfully, it shows a massage in the console, as shown in the following figure.

Step 8: Open the browser and invoke the URL https://localhost:8080. It returns a String that we have specified in the Routing.kt.