Klaxon: Expected a name but got LEFT_BRACE - json

Question

How can I read a "complex" json using Klaxon?
I'm trying to use klaxon's stream api as documentation say .
I'm using the beginObject method. If I use a json as given in the example everything is fine
val objectString = """{
"name" : "Joe",
"age" : 23,
"flag" : true,
"array" : [1, 3],
"obj1" : { "a" : 1, "b" : 2 }
}"""
But if I try to parse a json with a nested object as the following example I get the following error: "Expected a name but got LEFT_BRACE"
val objectString = """{
"name" : "Joe",
"age" : 23,
"flag" : true,
"array" : [1, 3],
"obj1" : {
"hello": { "a" : 1, "b" : 2 }
}
}"""
I don't see any reported issues in the github repo, so I wonder if there is a way to get this working.
cheers

Answer 1

Ok so I checked out the source, and it seems that nextObject() assumes that you are dealing with a simple key value object, where values are not objects.
Anyway, there is another way to parse a JSON of the format you specified, like below:
val objectString = """{
"name" : "Joe",
"age" : 23,
"flag" : true,
"array" : [1, 2, 3],
"obj1" : { "hello": {"a" : 1, "b" : 2 } }
}"""
class ABObj(val a: Int, val b: Int)
class HelloObj(val hello: ABObj)
class Obj(val name: String, val age: Int, val flag: Boolean, val array: List<Any>, val obj1: HelloObj)
val r = Klaxon().parse<Obj>(objectString)
// r is your parsed object
print(r!!.name) // prints Joe
print(r!!.array) // prints [1, 2, 3]
The classes I created are like below:
ABObj represents this JSON:
{"a": 1, "b": 2}
HelloObj represents this JSON:
{"hello": {"a": 1, "b": 2}}
And finally, Obj refers to the top level object.
Hope this helps.

Answer 2

With the Streaming API, you are in charge of parsing objects and arrays yourself, so when you encounter the name "obj1", you need to start a new beginObject() { ... } and parse that object there.
The documentation that you linked does exactly that:
while (reader.hasNext()) {
val readName = reader.nextName()
when (readName) {
"name" -> name = reader.nextString()
"age" -> age = reader.nextInt()
"flag" -> flag = reader.nextBoolean()
"array" -> array = reader.nextArray()
"obj1" -> obj1 = reader.nextObject()