Posts tagged: json

B2B sites often need to ensure that visitors register or enquire using a company email address rather than a free provider like Gmail or Yahoo. The approach below loads a JSON blocklist of free email domains, checks the user’s input on the fly using jQuery, and prevents form submission if a blocked domain is detected.

When you pass an array through json_encode() on the PHP side and then parse it with JSON.parse() or receive it via jQuery’s $.ajax, you may find that json_decode() returns null — or the JavaScript side receives unexpected string values instead of integers. The root cause is almost always a type mismatch in the PHP array.