A function to convert objects to string json.

NavArgEncoder.kt

import kotlinx.serialization.ExperimentalSerializationApi
import kotlinx.serialization.encodeToString
import kotlinx.serialization.json.Json
import java.net.URLEncoder
import java.nio.charset.StandardCharsets

inline fun <reified T> encodeToStringNavArg(arg: T): String {
    @OptIn(ExperimentalSerializationApi::class)
    val json = Json {
        ignoreUnknownKeys = true
        explicitNulls = false
        prettyPrint = true
        isLenient = true
        encodeDefaults = true
    }

    return URLEncoder.encode(json.encodeToString(arg), StandardCharsets.UTF_8.toString())
}