IE prompts to open or save json result from server

Question

Internet explorer in compatibility mode gets the data from the server in an ajax callback method, and pops-up a dialog if I want to save the data or open. How to get rid of

Answer 1

In my case, IE11 seems to behave that way when there is some JS syntax error in the console (doesn't matter where exactly) and dataType: 'json' has no effect at all.