How to debug this: `kotlinx.serialization.json.JsonParsingException: Invalid JSON at 1221: Expected ...

# serialization

[Lulu]

How to debug this: kotlinx.serialization.json.JsonParsingException: Invalid JSON at 1221: Expected '[, kind: kotlinx.serialization.UnionKind$POLYMORPHIC@1e6d1014'

[sandwwraith]

This happens because parser was expecting array of [typeName, object] for polymorphic deserialization

[Lulu]

How could I know why it was expecting that?

[Nikky]

you have something that takes alist of objects but it cannot be sure which classes are serializable.. there might be multiples

[Nikky]

so it would make a array with the first element being the type hint

[Lulu]

Thanks I think I figured it out