Hi This might be more a kotlinjs question: I have a dynamic typed js object, from my frontend which...

# kvision

[Kumaran Masilamani]

Hi

This might be more a kotlinjs question:
I have a dynamic typed js object, from my frontend which I want to pass as MyObject to backend

When I try this..

//frontend code
val jsonString = JSON.stringify(dynamicData)
val myObj  = JSON.parse<MyObject>(jsonString)
myService.someMethod(myObj)

//backend
This myObj is coming as "[object Object]"

and getting this error:
[reactor-http-nio-8] ERROR io.kvision.remote.KVServiceManager - Unexpected JSON token at offset 0: Expected '{, kind: CLASS'
JSON input: "[object Object]"

I have a workaround to pass the stringified json to backend and then parse as my type.
But just wanted to get some idea whether this can be done in frontend.

[Robert Jaros]

is MyObject serializable?

[Robert Jaros]

it needs to be @Serializable with kotlinx.serialization

[Kumaran Masilamani]

Yes, it is.

[Kumaran Masilamani]

all the nested types are also annotated with this Serializable.

[Robert Jaros]

I think you will not get true Kotlin class if you are using JS native JSON

[Robert Jaros]

instead of JSON.parse you should use Json.decodeFromString from kotlinx.serialization

[Robert Jaros]

you can use helper object io.kvision.utils.JSON.plain (or .nostrict) which has custom serializers for Date class already declared

[Kumaran Masilamani]

kotlinx.serialization.json.Json{ ignoreUnknownKeys = true }
                .decodeFromString<MyObject>(JSON.stringify(dynamicData))

This worked.. Cheers