Snippet for a conversation in the Cats Gitter channel

chainjsoncalls.scala

import scala.annotation.tailrec
import scala.concurrent.{ ExecutionContext => EC, _ }

trait Json // whatever JSON type you're using

def getJson(url: String)(implicit ec: EC): Future[Json] =
  ??? // whatever implementation you currently have

def getNextUrlFromJson(json: Json): Option[String] =
  ??? // whatever implementation you currently have  

def getAllJson(url: String)(implicit ec: EC): Future[Seq[Json]] =
  getJson(url) flatMap { json =>
    getNextUrlFromJson(json) match {
      case Some(nextUrl) => getAllJson(nextUrl).map(rest => json +: rest)
      case None          => Future.successful(Seq.empty)
    }
  }