libraryDependencies += "org.http4s" %% "http4s-play-json" % "0.23.13"

import org.http4s.play._
import play.api.libs.json._

// Lets fetch some JSON from a website and parse it 
// into a case class that has a play-json `Format` defined (Reads/Writes)

// Assumes that https://mydomain.invalid/sample.json responds:
// { "hello": "world" }

case class SampleResponse(hello: String)

object SampleResponse {
  // Play-json formatter for { "hello": "world" }
  implicit val format: Format[SampleResponse] = Json.format
}

// Fetch with an http4s client
val client: Client[F] = ???

val target = Uri.uri("http://mydomain.invalid/sample.json")

// The response will be deserialised to a `SampleResponse` 
// using the implicit play-json `Format`
val response: F[Sample] = httpClient.expect[SampleResponse](target)