Turn string into simple JSON in scala - json

Question

I have a string in scala which in terms of formatting, it is a json, for example
{"name":"John", "surname":"Doe"}
But when I generate this value it is initally a string. I need to convert this string into a json but I cannot change the output of the source. So how can I do this conversion in Scala? (I cannot use the Play Json library.)

Answer 1

If you have strings as
{"name":"John", "surname":"Doe"}
and if you want to save to elastic as mentioned here then you should use parseRaw instead of parseFull.
parseRaw will return you JSONType and parseFull will return you map
You can do as following
import scala.util.parsing.json._
val jsonString = "{\"name\":\"John\", \"surname\":\"Doe\"}"
val parsed = JSON.parseRaw(jsonString).get.toString()
And then use the jsonToEs api as
sc.makeRDD(Seq(parsed)).saveJsonToEs("spark/json-trips")
Edited
As #Aivean pointed out, when you already have json string from source, you won't be needing to convert to json, you can just do
if jsonString is {"name":"John", "surname":"Doe"}
sc.makeRDD(Seq(jsonString)).saveJsonToEs("spark/json-trips")

Answer 2

You can use scala.util.parsing.json to convert JSON in string format to JSON (which is basically HashMap datastructure),
eg.
scala> import scala.util.parsing.json._
import scala.util.parsing.json._
scala> val json = JSON.parseFull("""{"name":"John", "surname":"Doe"}""")
json: Option[Any] = Some(Map(name -> John, surname -> Doe))
To navigate the json format,
scala> json match { case Some(jsonMap : Map[String, Any]) => println(jsonMap("name")) case _ => println("json is empty") }
John
nested json example,
scala> val userJsonString = """{"name":"John", "address": { "perm" : "abc", "temp" : "zyx" }}"""
userJsonString: String = {"name":"John", "address": { "perm" : "abc", "temp" : "zyx" }}
scala> val json = JSON.parseFull(userJsonString)
json: Option[Any] = Some(Map(name -> John, address -> Map(perm -> abc, temp -> zyx)))
scala> json.map(_.asInstanceOf[Map[String, Any]]("address")).map(_.asInstanceOf[Map[String, String]]("perm"))
res7: Option[String] = Some(abc)