How to use fast-luhn - 1 common examples
To help you get started, we’ve selected a few fast-luhn examples, based on popular ways it is used in public projects.
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gretchenfitze / billing-form / src / index.js View on Github 
cardNumber.addEventListener('input', (event) => {
const number = event.target.value;
const bank = banksDB(number);
if (number.length >= 14) {
const isLuhnCheckPassed = luhn(number.split(' ').join(''));
cardNumber.classList.toggle('card__input_invalid', !isLuhnCheckPassed);
cardNumber.classList.toggle('card__input_valid', isLuhnCheckPassed);
} else {
cardNumber.classList.remove('card__input_invalid', 'card__input_valid');
}
if (bank.code) {
billingForm.classList.add(`card_bank-${(bank.code || 'other')}`);
bankName.innerText = bank.country === 'ru' ? bank.localTitle : bank.engTitle;
} else {
billingForm.className = 'card';
bankName.innerText = '';
}
});fast-luhn
A fast Luhn algorithm for validating credit cards
