I want to parse a json that looks like: ```{ "staticKey": "strungValue", "dynamicKey": { map s...

# serialization

[iamthevoid]

I want to parse a json that looks like:

{
   "staticKey": "strungValue",
   "dynamicKey": { map string : double }
}

problem is that the dynamicKey is really dynamic and can change from request to request (i know what it be in each request, because it equals request param). What is the best way to deserialize structure like that?

[Adam S]

what about dynamicKey is dynamic? The value? The name?

You can try using JsonElement

@Serializable
data class MyData(
  val staticKey: String,
  val dynamicKey: JsonElement,
)

And then you can use a when () {} statement to decode it

[iamthevoid]

Name of field is dynamic. It is free api, so i can't influence on api (

[Adam S]

the easiest way is to just decode the whole response to a JsonObject

import kotlinx.serialization.decodeFromString
import kotlinx.serialization.json.Json
import kotlinx.serialization.json.JsonObject

fun main() {
  val obj = Json.decodeFromString<JsonObject>(
    """
      {
         "staticKey": "strungValue",
         "dynamicKey": { map string : double }
      }
    """.trimIndent()
  )

  println(obj)
}

[Adam S]

if you know the expected name & value of dynamicKey, and if you really really wanted to decode to a class, you could try writing a custom serializer https://github.com/Kotlin/kotlinx.serialization/blob/master/docs/serializers.md#hand-written-composite-serializer

but I do not recommend this, I think it will be very difficult and not really worth it. JsonObject is better

[iamthevoid]

I'd want to find easiest way, because i does not want to spend a much time for it. So i'll try JsonObject, thanks

[ephemient]

https://github.com/Kotlin/kotlinx.serialization/issues/1978