Is any possibility read some fields as enum values when I use

JSON.parse()

? For example:

// JSON
{
    name: “Machine #1”
    status: 1 // possible values 1,2,3,4
}

// Data class
data class Data(val name: String, val status: Status)

enum class Status {
    NORMAL(1),
    DISABLED(2),
    ....
}

// read code
JSON.parse<Data>(source)

No typesafe way now, but we think about something like “inline" classes. Right now You can declare own external enum class.

I don't understand how external enum class will help me. JS realization where static field are numbers required?

how external enum class will help me

In your kotlin code it will be typed but at runtime it still will be number

JS realization where static field are numbers required?

yes, if you want to use entries in Kotlin code, like

Status.NORMAL

. I’d add it anyway, since it will be safer.