Question

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Determine whether JSON is a JSONObject or JSONArray

I have a server that returns some JSONArray by default, but when some error occurs it returns me JSONObject with error code. I’m trying to parse json and check for errors, I have piece of code that checks for error:

public static boolean checkForError(String jsonResponse) {

    boolean status = false;
    try {

        JSONObject json = new JSONObject(jsonResponse);

        if (json instanceof JSONObject) {

            if(json.has("code")){
                int code = json.optInt("code");
                if(code==99){
                    status = true;
                }
            }
        }

    } catch (Exception e) {
        e.printStackTrace();
    }

    return status ;
}

but I get JSONException when jsonResponse is ok and it’s a JSONArray (JSONArray cannot be converted to JSONOBject)How to check if jsonResponse will provide me with JSONArray or JSONObject ?

Answer 1

Use JSONTokener. The JSONTokener.nextValue() will give you an Object that can be dynamically cast to the appropriate type depending on the instance.

Object json = new JSONTokener(jsonResponse).nextValue();
if(json instanceof JSONObject){
    JSONObject jsonObject = (JSONObject)json;
    //further actions on jsonObjects
    //...
}else if (json instanceof JSONArray){
    JSONArray jsonArray = (JSONArray)json;
    //further actions on jsonArray
    //...
}