ibantools-germany
Version:
IBAN Validator and Generator for German Bank Accounts
33 lines (32 loc) • 1.16 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);
const givenCheckDigit = digits.pop(); // Check digit is last digit
const weightedDigits = (0, helper_1.weightDigitsRTL)(digits.slice(1), [2, 3, 4, 5, 6, 7, 8, 9]);
const sum = (0, helper_1.calculateSum)(weightedDigits);
const { difference: calculatedCheckDigit } = (0, helper_1.moduloDifference)(sum, 11, 11);
if (calculatedCheckDigit === 11) {
if (givenCheckDigit === 0) {
return "VALID";
}
return "INVALID";
}
if (calculatedCheckDigit === 10) {
if (digits.slice(1, 2)[0] >= 8 && givenCheckDigit === 0) {
return "VALID";
}
return "INVALID";
}
if (givenCheckDigit === calculatedCheckDigit) {
return "VALID";
}
return "INVALID";
};