How do I de-serialize this json? - json

Question

I am working on a project where I need to access currency rates once a day so I am trying to use this json.
To read this, I am simply getting the text of the URL and then trying to use the JSONReader to de-serialize.
val url = URL("https://www.floatrates.com/daily/usd.json")
val stream = url.openStream()
url.readText()
val jsonReader = JsonReader(InputStreamReader(stream))
jsonReader.isLenient = true
jsonReader.beginObject()
while (jsonReader.hasNext()) {
val codeName:String = jsonReader.nextName()
jsonReader.beginObject();
var code:String? = null
var rate = 0.0
while (jsonReader.hasNext()) {
val name:String = jsonReader.nextName()
when(name){
"code" -> {
code = jsonReader.nextString()
break
}
"rate" -> {
rate = jsonReader.nextDouble()
break
}
else -> {
jsonReader.skipValue()
}
}
code?.let {
rates?.set(it, rate)
}
}
}
jsonReader.endObject();
When I run the code , I get:
Expected BEGIN_OBJECT but was STRING
at
jsonReader.beginObject();
When I try using Gson, with the code below:
var url = URL("https://www.floatrates.com/daily/usd.json").readText()
//url = "[${url.substring(1, url.length - 1)}]"
val gson = Gson()
val currencies:Array<SpesaCurrency> = gson.fromJson(url, Array<SpesaCurrency>::class.java)
I get this error :
Expected BEGIN_OBJECT but was STRING at line 1 column 3 path $[0]
at:
gson.fromJson(url, Array<SpesaCurrency>::class.java)
SpesaCurrency.kt looks like this:
class SpesaCurrency(
val code:String,
val alphaCode:String,
val numericCode:String,
val name:String,
val rate:Float,
val date:String,
val inverseRate:Float
)
Any help is greatly appreciated.

Answer 1

I think there is one
jsonReader.endObject();
missing in your code. That imbalance causes the program to fail after the first object has been read. Add it after the inner
while (jsonReader.hasNext()) {
...
}
loop.