catch json response in jquery using ajax without refresh [on hold]

I am missing something...but i don`t know what. I want to make an ajax request using jquery and laravel 5.4. In java script i have this script

My html form is form

The if for checking if the password match don`t work. It goes directly to url and get response from server in browser (plain json)

 return response()->json(['success' => false, 'message' => 'Password don`t match!']);

How to check (on client) if password match? (then do the ajax) How to catch the response and showing in alert? (not plain json in browser) WITHOUT REFRESH???

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