Proper status codes for JSON responses to Ajax calls?

Question

My project is returning JSON to Ajax calls from the browser. I\'m wondering what the proper status code is for sending back with responses to invalid (but successfully handled)

Answer 1

I would send a '400 Bad Request' header back in response with information in json of what went wrong. Then catch the event with jquerys $.ajaxError() event handler and parse the error message i got in return to deliver good feedback to the end user.

You can read more about the ajaxError event handler here!