gs1 checkdigit generation and validation
npm install gs1gs1
---
Generate check digits for various gs1 formats.
GTIN-8, GTIN-12, GTIN-13, GTIN-14, GSIN, SSCC
usage
-----
``js
const gs1 = require('gs1')
console.log(gs1('2345678'));
//23456785
console.log(gs1.checkdigit('2345678'));
//5
console.log(gs1.validate('23456785'));
//true
console.log(gs1.validate('23456783'));
//false
``
license
-------
MIT