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jQuery Credit Card Validator detects and validates credit card numbers. It’ll tell you the detected credit card type and whether the number length and Luhn checksum are valid for the type of card.

jQuery Credit Card Validator is written in CoffeeScript and (surprise, surprise!) is a jQuery plugin. It attaches to the input event (with a fallback to the keyup event) and, every time the number in the input field changes, it calls a function defined by you