ibantools-germany
Version:
IBAN Validator and Generator for German Bank Accounts
25 lines (24 loc) • 992 B
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, 8));
const givenCheckDigit = digits.pop();
const weightedDigits = (0, helper_1.weightDigits)(digits, [1, 2, 1, 2, 1, 2]);
const crossSumDigits = (0, helper_1.calculateCrossSums)(weightedDigits);
const sumMinus1 = (0, helper_1.calculateSum)(crossSumDigits) - 1;
const { difference: calculatedCheckDigit } = (0, helper_1.moduloDifference)(sumMinus1, 11, 10);
if (calculatedCheckDigit === 10 && givenCheckDigit === 0) {
return "VALID";
}
if (calculatedCheckDigit === givenCheckDigit) {
return "VALID";
}
return "INVALID";
};