Fully functional GraphQL & Ktor server

We will be using the ktor intellij plugin to get setup.

The very first thing we'll be doing is creating a new IntelliJ project and use the ktor template.

After this we'll press "Next" and fill out the necessary information and then press "Finish". Now we have a brand new ktor project. Now we can add the dependencies needed to our gradle.properties and build.gradle.kts files.

gradle.properties

kgraphql_version=x.x.x

Replace x.x.x with the latest version .

Kotlin Gradle Script

val ktor_version: String by project
val kotlin_version: String by project
val logback_version: String by project
val kgraphql_version: String by project // <-- Add this line

...

dependencies {
    implementation("org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version")
    implementation("io.ktor:ktor-server-netty:$ktor_version")
    implementation("ch.qos.logback:logback-classic:$logback_version")
    implementation("com.apurebase:kgraphql:$kgraphql_version")      // <-- Add these two lines
    implementation("com.apurebase:kgraphql-ktor:$kgraphql_version") // <-- Add these two lines
    testImplementation("io.ktor:ktor-server-tests:$ktor_version")
}

Gradle

dependencies {
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version"
    implementation "io.ktor:ktor-server-netty:$ktor_version"
    implementation "ch.qos.logback:logback-classic:$logback_version"
    implementation "com.apurebase:kgraphql:$kgraphql_version"      // <-- Add these two lines
    implementation "com.apurebase:kgraphql-ktor:$kgraphql_version" // <-- Add these two lines
    testImplementation "io.ktor:ktor-server-tests:$ktor_version"
}

The only thing left is installing the GraphQL feature onto our server by opening src/Application.kt and use these lines as the Application.module function

Application.kt

fun Application.module(testing: Boolean = false) {
    install(GraphQL) {
        configureRouting()
        playground = true
        schema { 
            query("hello") {
                resolver { -> "World" }
            }
        }
    }
}

Now we have a fully functional GraphQL Server and we can startup our server by pressing the green play icon beside the main function.

We can test out our server by going to localhost:8080/graphql and our hello query should work by providing this query to the GraphQL Playground

A great place to learn more is following the Star Wars tutorial. Everything mentioned in this tutorial can be placed inside the schema {} block.