Serialize Form data (including array) to JSON object

Question

So I basically have a modal to add an object, that I want to serialize to JSON Object. To serialize each input will have a name and value of course.

The thing is one of those inputs have a value which is an array (list of ids). This input is actually hidden and I have set it my self.

Following are the steps I followed

1. Set the hidden input values

   $('input[name="students"]').val(JSON.stringify(idsArray));
   

2. Serialize the form into object

   action_object = $('.actionForm').serializeObject();
   

   Source for SerialzeObject function Convert form data to JavaScript object with jQuery

3. Convert to JSON object

   action_JSON = JSON.stringify(action_object);
   

4. Result is as following

   {"Title":"","students":"[\"2015022\",\"2015027\",\"2015032\"]","ActionType":"3","Description":"yjtkt","Date":"2015-11-17"}
   

Now the object seems ok.

However check for the students array. Is that normal and if not how that can be fixed ?