ajaxform - How to Get JSON Data from PHP Script using jQuery Ajax

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Solution:

You should set your content-type header in your back-end response. (Content-Type Header)

Add header('Content-Type: application/json'); before echo line in your php code, Or add dataType: 'JSON' to your ajax argument. (PHP header function)

And you should pay attention to @RiggsFolly's comment about sql injection:

Your script is open to SQL Injection Attack. Even if you are escaping inputs, its not safe! You should alway use prepared parameterized statements in either the MYSQLI_ or PDO API's instead of concatenating user provided values into the query. Never trust ANY user input!