calculate european iban with javascript

Question

I have the german "Bankleitzahl" and the account number, now I would like to calculate the corresponding IBAN with javascript, so I don't have to enter my banking-data on an untrustworthy website.

How would I calculate this with javascript on my own client?

Answer 1

I have found a project in github https://github.com/arhs/iban.js that make checking of IBAN a very easy stuff.

Is something like:

<script src="iban.js"></script>
<script>
    // the API is now accessible from the window.IBAN global object
    IBAN.isValid('hello world'); // false
    IBAN.isValid('BE68539007547034'); // true
</script>

Is licensed under the MIT license so you can check how it do the validation and try to use it to generate your IBAN.

Answer 2

So, if you want to reconstruct the IBAN code using the different old-style national components at hand, you can use the Wikipedia article as a base. Specifically, a german IBAN is built up as follows:

DEkk bbbb bbbb cccc cccc cc

where

• kk is the check code
• bbbbbbbb is the BLZ
• cccccccccc is the account number

Note: the exact format is country-dependent, the example above is for Germany

Tom's Cafe offers a full JavasScript implementation you can use in your own application, because the check sum calculation is not trivial.