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In my code I my a call to a service. from the returned json object I am interested in an object. this object is a json array. sometimes, depending on the provided info in the submit this json array object is empty or does not exist.

How can I check if the object in the json object is of type jsonarray before I create an object out from it?

JSONObject VODB = (JSONObject) JSONreturnObj.get("VODB");
 if (null != VODB.get("KNDV430")){
  if (VODB.getJSONArray("KNDV430") instanceof JSONArray){
   JSONArray KNDV430 = VODB.getJSONArray("KNDV430");
   customer.setCustResp((String) ((JSONObject)KNDV430.get(0)).get("responsible"));
 }
}

now I get a message in my server log:

org.json.JSONException: JSONObject["KNDV430"] is not a JSONArray.

which I want to avoid.

How should I adapt my code?

Replace

if (VODB.getJSONArray("KNDV430") instanceof JSONArray)

with

if (VODB.get("KNDV430") instanceof JSONArray)

Java instanceof, How do you check if it is a JSON object? First of all, there's no such thing as a JSON object. What you've got in your question is a JavaScript object literal (see here for a great discussion on the difference). Here's how you would go about serializing what you've got to JSON though: I would use an anonymous type filled with your results type:

You're getting that error from the first getJSONArray in the condition of the if. So this should work:

JSONObject VODB = (JSONObject) JSONreturnObj.get("VODB");
if (null != VODB.get("KNDV430")){
    if (VODB.get("KNDV430") instanceof JSONArray){
        JSONArray KNDV430 = VODB.getJSONArray("KNDV430");
        ...
    }
}

Introduction to JSON-Java, How do I know if JSON is array or object? This developer guide tells how to Return Object from a Method in JAVA using Java Object Methods. First, we will discuss the return type of any method.Then we will see the control flow from invoking code to invoked code and again when control goes back to invoking code.

You can view the source code of the method JSONObject.getJSONArray().

How to check if JavaScript object is JSON, the type of yourself without worrying about ClassCastExceptions, and there ya go. My server side code returns a value which is a json object on success and a string 'false' on failure. should return an object of type Since it's just false

How to check whether the given object is object or Array in JSON , @param jsonObject Object to check. * @param instanceType The type to check for the object. * @returns true if object is of the given instanceĀ  In JSON, functions are not allowed as object values. The JSON.stringify() function will remove any functions from a JavaScript object, both the key and the value: Example

Detecting Type of JSON Object, Object. A JSONObject is an unordered collection of name/value pairs. A get method returns a value if one can be found, and throws an exception if There are also typed get and opt methods that do type checking and type coercion for you. There are also typed get and opt methods that do type checking and type coercion for you. The opt methods differ from the get methods in that they do not throw. Instead, they return a specified value, such as null. The put methods add or replace values in an object. For example, myString = new JSONObject().put("JSON", "Hello, World!").toString();

JSONObject, The generic get() and opt() methods return an object, which you can cast or query for type. There are also typed get and opt methods that do type checking andĀ  How to parse JSON in Java JSON (JavaScript Object Notation) is a lightweight, text-based, language-independent data exchange format that is easy for humans and machines to read and write. JSON can represent two structured types: objects and arrays.