ibantools-germany
Version:
IBAN Validator and Generator for German Bank Accounts
26 lines (25 loc) • 1.02 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 validateDigits = digits.slice(0, 7);
const [givenCheckDigit] = digits.slice(7, 8);
if (digits.slice(8, 9)[0] === 9) {
validateDigits.push(...digits.slice(8, 10));
}
const weightedDigits = (0, helper_1.weightDigits)(validateDigits, [2, 1, 2, 1, 2, 1, 2, 1, 2]);
const crossSumDigits = (0, helper_1.calculateCrossSums)(weightedDigits);
const sum = (0, helper_1.calculateSum)(crossSumDigits);
const calculatedCheckDigit = 10 - (0, helper_1.getUnitFromNumber)(sum);
if (calculatedCheckDigit === givenCheckDigit) {
return "VALID";
}
return "INVALID";
};