Create JSON from the List using Json4s

Question

I have list of elements containing product name val productList = List[String] with values as product1,product2,product3

now I need to create a Json from the list as

{
   "ProductName":["product1","product2","product3"]
}

how can I achieve this using scala json4s framework.

Answer 1

You should be able to render the list directly. Json4s can implicitly convert a list of strings into a JArray, which then becomes a json list.

import org.json4s._
import org.json4s.JsonDSL._
import org.json4s.jackson.JsonMethods._

val productList: List[String] = List("product1", "product2", "product3")
val obj: JObject = ("ProductName" -> productList)
compact(render(obj))
//res1: String = {"ProductList":["product1","product2","product3"]}

The readme for Json4s has some similar examples.

Answer 2

You may also try write method.

import org.json4s._
import org.json4s.jackson.Serialization.write
import org.json4s.jackson.JsonMethods._
implicit val formats = DefaultFormats
val json = write(Map("productList" -> productList))