IE tries to download json response while submitting jQuery multipart form data containing file
You can simply return JSON from the controller as “text/html” and then parse it on the client side using JQuery.parseJSON(). Controller: return this.Json( new { prop1 = 5, prop2 = 10 }, “text/html”); Client side: jsonResponse = $.parseJSON(response); if(jsonResponse.prop1==5) { … } This solution has been working for me.