Try some of these numbers: 4000000000000002 4026000000000002 501800000009 5100000000000008 6011000000000004 How to use it $('#cc_number').validateCreditCard(function(result) { alert('CC type: ' + result.card_type + '\nLength validation: ' + result.length_valid + '\nLuhn validation: + result.luhn_valid'); }); How it works jQuery Credit Card Validator is written in CoffeeScript and (surprise, surpri