@prm/luhn

A zero-dependency Node.js module for calculating a numeric check digit for alphanumeric strings. The exported luhn() function uses the Luhn algorithm to calculate a check digit based on an input string.

Usage no npm install needed!

<script type="module">
  import prmLuhn from 'https://cdn.skypack.dev/@prm/luhn';
</script>

README

@prm/luhn

A zero-dependency Node.js module for calculating a numeric check digit for alphanumeric strings. The exported luhn() function uses the Luhn algorithm to calculate a check digit based on an input string.

Usage

Node.js

const { luhn } = require("@prm/luhn")

luhn("Z2N 9Z3 F0 K3") // returns 2

SQL

SELECT luhn("1245496594") -- returns 3

Testing

npm run test