Add Kotlin Serialization JSON compatibility

The kotlinx.serialization module for JSON doesn’t have easy support or tutorials in Javalin docs.

If you could, please add it for integration with this library.

[tipsy]

Sorry @Freezystem, I completely missed your reply!

You can read a bit about extension functions here: https://kotlinlang.org/docs/reference/extensions.html. You would have to do something like:

fun Context.kotlinxJson() {

}

With your desired signatures.

Then you can import these when you want to use it, and call them like ctx.kotlinxJson().

[rbygrave]

In terms of writing a generic object to JSON with Gson or Jackson we see that they have options for using Class<?> and an additional option for using java.lang.reflect.Type (Gson) or for Jackson it’s own JavaType or TypeReference<?>.

Gson:

java.lang.String toJson​(java.lang.Object src)
java.lang.String toJson​(java.lang.Object src, java.lang.reflect.Type typeOfSrc)

https://www.javadoc.io/static/com.google.code.gson/gson/2.8.6/com.google.gson/com/google/gson/Gson.html#toJson(java.lang.Object,java.lang.reflect.Type)

Jackson:

ObjectWriter	writerFor(Class<?> rootType)
ObjectWriter	writerFor(JavaType rootType)
ObjectWriter	writerFor(TypeReference<?> rootType)

http://fasterxml.github.io/jackson-databind/javadoc/2.10/com/fasterxml/jackson/databind/ObjectMapper.html#writerFor-java.lang.Class-

Conceptually in Java land for Gson it would suggest having an additional/overloaded toJson() that took java.lang.reflect.Type - but that wouldn’t work for Jackson which has it’s own JavaType and TypeReference (but for myself I don’t think we need this for Jackson and it would be worth checking Gson - as in, is this more a kotlin/kotlinx.serialization issue/requirement? I should confirm when Jackson and Gson need generic type on serialisation to json).

Hmmm.