How to debug a model

Hi guys, I need to debug a model. I coded this snippet:

jQuery.sap.require("sap.ui.model.json.JSONModel");

var oModel = new sap.ui.model.json.JSONModel("/myHandler?sap-client=199&data=product_list ");

I'm sure that my back-end web service is invoked and data is returned (I set a break-point into the ABAP method) but I would like to debug this oModel.

When I switch the javascript debug on in Chrome, this javascript object doesn't seem to have its oData properly filled.

Any idea?

Thanks!