ibantools-germany
Version:
IBAN Validator and Generator for German Bank Accounts
27 lines (26 loc) • 1.01 kB
JavaScript
;
/**
* ibantools-germany
* Copyright (c) 2022-2026 Markus Baumer <markus@baumer.dev>
* SPDX-License-Identifier: MIT OR MPL-2.0
*/
Object.defineProperty(exports, "__esModule", { value: true });
const helper_1 = require("../helper");
exports.default = (number) => {
const paddedNumber = (0, helper_1.paddedAccountNumber)(number);
const digits = (0, helper_1.getDigits)(paddedNumber.slice(1, 7));
const givenCheckDigit = Number(paddedNumber.slice(9, 10));
const weightedDigits = (0, helper_1.weightDigits)(digits, [6, 5, 4, 3, 2, 1]);
const sum = (0, helper_1.calculateSum)(weightedDigits);
const { difference: calculatedCheckDigit } = (0, helper_1.moduloDifference)(sum, 11, 11);
if (calculatedCheckDigit === 11 && givenCheckDigit === 0) {
return "VALID";
}
if (calculatedCheckDigit === 10 && givenCheckDigit === 1) {
return "VALID";
}
if (calculatedCheckDigit === givenCheckDigit) {
return "VALID";
}
return "INVALID";
};