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I believe the reason why your try/catch doesn’t work is because code the Ajax success/error callbacks are outside the scope of the try/catch. The success/error callbacks can’t even read variables stated outside the Ajax call.

Here is an example:

So how do you better track what function sends out errors?

I haven’t used it before but I believe you can use .ajaxError() to help track these things. Here is jQuery’s page on it. Maybe it’ll help you out.