is-valid-abn/dist/index.js

Check if a number is a valid Australian Business Number (ABN)

var weights = [10, 1, 3, 5, 7, 9, 11, 13, 15, 17, 19];
export default function isValidABN(rawAbn) {
    if (!rawAbn) {
        return false;
    }
    // strip non-alphanumeric characters
    var abn = rawAbn.toString().replace(/[^a-z\d]/gi, '');
    // check if length is 11 digits
    if (abn.length !== 11) {
        return false;
    }
    // apply ato check method
    var sum = 0;
    weights.forEach(function (weight, position) {
        var digit = Number(abn[position]) - (position ? 0 : 1);
        sum += weight * digit;
    });
    var checksum = sum % 89;
    return checksum === 0;
}