JavaScript library to analyze or create a CLABE number for a Mexican bank account

CLABE (Clave Bancaria Estandarizada — Spanish for "standardized banking code") is a banking standard from the Mexican Bank Association (Asociación de Bancos de México — ABM) for uniform numbering of bank accounts.  CLABE numbers are 18 digits long.  See: https://en.wikipedia.org/wiki/CLABE

Try it out:
https://centerkey.com/clabe

Include in a web page:

<script src=clabe.min.js></script>

or from the jsdelivr.com CDN:

<script src=https://cdn.jsdelivr.net/npm/[email protected]/dist/clabe.min.js></script>

Install package:

$ npm install clabe-validator

Import package:

const clabe = require('clabe-validator');

Pass the CLABE number as an 18-character string into clabe.validate(clabeNum).

const clabeNum = '002010077777777771';
const clabeCheck = clabe.validate(clabeNum);
console.log(clabeCheck.ok ? '¡Que bueno!' : '¡Muy mal!');
console.log('Your bank: ' + clabeCheck.bank);

{
   ok:       true,
   error:    null,
   formatOk: true,
   tag:      'BANAMEX',
   bank:     'Banco Nacional de México, S.A.',
   city:     'Aguascalientes',
   account:  '07777777777'
}

{
   ok:       false,
   formatOk: true,
   error:    'invalid-city',
   message:  'Invalid city code: 000'
}

The formatOk field indicates if the CLABE's length and checksum are both valid (even if the bank code or city code are invalid).

Pass the bank code, city code, and account number into clabe.calculate(bankCode, cityCode, accountNumber) and get the 18-character CLABE number back.

const clabeNum = clabe.calculate(2, 10, 7777777777);
console.log(clabeNum === '002010077777777771');  //true

1. Feel free to submit questions at: github.com/center-key/clabe-validator/issues
2. To be a contributor, fork the project and run the commands npm install and npm test on your local clone.  Make your edits and rerun the tests.  Pull requests welcome (no need to update the version in package.json or any files in the dist folder as they are all updated as part of the release process).

CLABE Validator code is open source under the MIT License, and the documentation is published under the CC BY-SA 4.0 license.