Kotlin Data Class from Json using GSON

Data class:

data class Topic(
  @SerializedName("id") val id: Long, 
  @SerializedName("name") val name: String, 
  @SerializedName("image") val image: String,
  @SerializedName("description") val description: String
)

to JSON:

val gson = Gson()
val json = gson.toJson(topic)

from JSON:

val json = getJson()
val topic = gson.fromJson(json, Topic::class.java)