uk-modulus-check

UKModulusCheck

Overview

TypeScript class that validates UK bank account details using the modulus checking algorithm.

It only users vanilla typescript, and the 'fs' file-loading library.

From time to time, Vocalink updates the txt files here mapping sort-code ranges to validation weights. We currently use v7-90 (valid from 17 August 2024).

Installation

npm install uk-modulus-check

Usage

const ModulusChecker = require('uk-modulus-check');

const modulusChecker = new ModulusChecker();

console.log(modulusChecker.check('180002', '00000190')); // true

console.log(modulusChecker.check('938063', '15763217')); // false

', accountNumber: '', expectedResult: true

Details

This specification details logic to differentiate valid vs. invalid pairs of sort-code and account number.

A mathematical algorithm compares the two values, and check if the two can be paired together legitimately.

This page details any changes to the specification.

License

MIT

Credits

Many thanks to bazerk/uk-modulus-checking for inspiration (Python)

Also thanks to uphold/uk-modulus-checking for creating a good Javascript implementation. It doesn't seem to be updated since valacdos-v640, which motivats the create (12/10/2020)