You could build a debug page in your app to display the data. Based on the prupose of a debug page, you can build them easily with the standard modelling wizards of mendix without keeping an eye on visual details, but you can also style them up if you like :)
How did you inserted data? Didn’t you use overview page that contain a data grid / list view and new/edit page to enter data? If yes, then you already see the inserted objects in overview page and in edit page when you edit the object.
You can add overview page(s) with the data you want to see and re-run the application.
Hope this helps!
1.Goto the entity which u want to see the inserted data.
2.Right click on the entity and click ‘Generate overview pages’.
3.Goto Navigation and map the overview page in navigation.