American Express starts with the number 34 or 37. ![]() MasterCards start with the number 51, 52, 53, 54, or 55. The checksum 60 ends with the number 0, therefore it a syntactically sound credit card number Identifying Credit Card TypesĪside from the checksum, credit card number numbers also identify the type of credit card company. Starting from the second-to-last-digit, multiply the last number by 2.ġ + 4 + 1 + 4 + 8 + 1 + 8 +1 + 2 + 2 + 0 = 32įinally add the digits that were not multiplied to the sum Use (''), () and () in combination with parseInt () to obtain an array of digits. Take for example the following American Express number, 378734493671000. Write a JavaScript program to implement the Luhn Algorithm used to validate a variety of identification numbers, such as credit card numbers, IMEI numbers, National Provider Identifier numbers etc. If the total’s last digit is 0 then the number is valid! Multiply every other digit by 2, starting with the number’s second-to-last digit, and then add those products’ digits together.Īdd the sum to the sum of the digits that weren’t multiplied by 2. Here’s a simple break down on Luhn’s algorithm. The process of validation checking is based on a checksum algorithm created by Hans Peter Luhn. Usually at the front end, Javascript would handle the validation to check if the credit card is a valid card before a call is sent to the servers. (1st, 3rd, etc.Most of us have encountered this screen when trying to make a payment for an online purchase. because it is not supported by JavaScript 1.0įor (var i = 0 i = "51") & (CCN_digits.substring (0, 2) 9) Note - the isNaN (Not a Number) function is not used ![]() get the digits from the entered Card Number CCN_digits stores just the digits from the Credit Card Number Let's put this number into a table that enumerates Which should be somewhat reminiscent of a DiscoverĬard number. Now we are going to work an example for what might actually be a credit Almost all institutions that create and require unique account or identification numbers use the Mod 10 algorithm. In fact, the LUHN formula is widely used to generate the check digits of many different primary account numbers. The LUHN formula is also used to check Canadian Social Insurance Number (SIN) validity. Shortly thereafter, credit card companies adopted it.īecause the algorithm is in the public domain, it can be used by anyone. The LUHN formula was created in the late 1960s by a group of mathematicians.
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