JavaScript Credit Card Validation

This script checks credit card numbers and expiry dates for validity. Use the example below to see how it works. NB only the format of the expiry date is checked with this script - it doesn't check whether or not the card has expired.

This script is free to use as long as you don't change any of the comments in the JavaScript source file. Click the download button above to get a zip file containing the source file and a sample HTML document.