How to use JSONObject from Kotlin JS

Question

I am new to Kotlin JS.

I am trying to port the business logic of my android app to Kotlin JS.

My app uses the class org.json.JsonObject to do custom serialization. I can't use KotlinX serialization with annotations because my classes are inline and these annotations are not supported.

The Kotlin-JS project uses Gradle Kotlin DSL. I am specifying the dependency as "implementation ("org.json:json:20190722")". The compiler throws the error "unresolved reference" for anything from the library. I suspect it is not legal to link to a java library this way for Kotlin-JS. Is this true?

What is the best way to get an implementation of JsonObject into my app? Do I need to copy the source code into my project and compile it to JS myself?

Thanks for any help.

score 0 · Answer 1 · answered Jul 10 '20 at 12:58

If you don't want to use the annotations in the kotlinx.serizalization library, you can still include it in your android and js platforms.

You will just need to construct and use the JsonObject type that is present on both platforms manually.

You can see the JsonObject definition in the library here:

https://github.com/Kotlin/kotlinx.serialization/blob/ffe216f0293231b09eea24a10aa4bc26ff6d5b90/runtime/commonMain/src/kotlinx/serialization/json/JsonElement.kt#L217

Here is an example of manually constructing a JsonObject using kotlinx.serialization classes

data class AnalyticsEvent(
    val name: Event,
    val columns: Map<Column, JsonPrimitive>? = null,
    val properties: Map<Property, JsonElement>? = null
) : LoggingEvent() {
    override fun toJson(): JsonObject {
        val content: MutableMap<String, JsonElement> = mutableMapOf()

        content[EVENT_NAME_KEY] = JsonPrimitive(name.actual)

        val columnJSON = columns?.mapKeys { it.key.actual }
        columnJSON?.let {
            content[EVENT_COLUMNS_KEY] = JsonObject(columnJSON)
        }

        val propertiesJSON = properties?.mapKeys { it.key.actual }
        propertiesJSON?.let {
            content[EVENT_PROPERTIES_KEY] = JsonObject(propertiesJSON)
        }

        return JsonObject(content)
    }

How to use JSONObject from Kotlin JS

1 Answers1