make sure you also set `encodeDefaults = false` in...

# serialization

[Nikky]

make sure you also set encodeDefaults = false in Json constructor call

[galex]

I’ve added it like that and I still receive the error:

HttpClient(Js) {
        install(JsonFeature) {
            serializer = KotlinxSerializer(Json(encodeDefaults = false))
        }

Seems ok right?

[galex]

This is my model:

@Serializable
data class Profile(
    val id: Int,
    val firstName: String? = null,
    val lastName: String? = null) {

    constructor(user: User): this(user.id, user.firstName, user.lastName)
}

[galex]

So @Optional on those fields with default value works, not encodeDefaults = false for some reason

[Nikky]

but you need to add @Optional to each value with default values, i wonder if it is because you add a constructor

[Nikky]

@Serializable
data class Profile(
    val id: Int,
    @Optional val firstName: String? = null,
    @Optional val lastName: String? = null) {
}

this should certainly work.. maybe try turning your contructor into a companion object method like operator fun invoke(user: User)