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A general purpose library for building credit card forms, validating inputs and formatting numbers.


A general purpose library for building credit card forms, validating inputs and formatting numbers.

We consider jQuery.payment to be feature complete. We continue to use it in production, and we will happily accept bug reports and pull requests fixing those bugs, but we will not be adding new features or modifying the project for new frameworks or build systems.

The library was born in a different age, and we think it has served tremendously, but it is fundamentally doing too many things. Complecting DOM element manipulation, input masking, card formatting, and cursor positioning makes it difficult to test and modify. An ideal version of this library would separate the independent components and make the internal logic functional.

You can make an input act like a credit card field (with number formatting and length restriction):


Then, when the payment form is submitted, you can validate the card number on the client-side:

var valid = $.payment.validateCardNumber($('').val());
if (!valid) {
  alert('Your card is not valid!');
  return false;

You can find a full demo here.

Supported card types are:

  • Visa
  • MasterCard
  • American Express
  • Diners Club
  • Discover
  • UnionPay
  • JCB
  • Maestro
  • Forbrugsforeningen
  • Dankort

(Additional card types are supported by extending the $ array.)

Formats card numbers:

  • Includes a space between every 4 digits
  • Restricts input to numbers
  • Limits to 16 numbers
  • Supports American Express formatting
  • Adds a class of the card type (e.g. 'visa') to the input



Formats card expiry:

  • Includes a / between the month and year
  • Restricts input to numbers
  • Restricts length



Formats card CVC:

  • Restricts length to 4 numbers
  • Restricts input to numbers



General numeric input restriction.



Validates a card number:

  • Validates numbers
  • Validates Luhn algorithm
  • Validates length


$.payment.validateCardNumber('4242 4242 4242 4242'); //=> true 

Validates a card expiry:

  • Validates numbers
  • Validates in the future
  • Supports year shorthand


$.payment.validateCardExpiry('05', '20'); //=> true 
$.payment.validateCardExpiry('05', '2015'); //=> true 
$.payment.validateCardExpiry('05', '05'); //=> false 

Validates a card CVC:

  • Validates number
  • Validates length to 4


$.payment.validateCardCVC('123'); //=> true 
$.payment.validateCardCVC('123', 'amex'); //=> true 
$.payment.validateCardCVC('1234', 'amex'); //=> true 
$.payment.validateCardCVC('12344'); //=> false 

Returns a card type. Either:

  • visa
  • mastercard
  • amex
  • dinersclub
  • discover
  • unionpay
  • jcb
  • maestro
  • forbrugsforeningen
  • dankort

The function will return null if the card type can't be determined.


$.payment.cardType('4242 4242 4242 4242'); //=> 'visa' 

Parses a credit card expiry in the form of MM/YYYY, returning an object containing the month and year. Shorthand years, such as 13 are also supported (and converted into the longhand, e.g. 2013).

$.payment.cardExpiryVal('03 / 2025'); //=> {month: 3, year: 2025} 
$.payment.cardExpiryVal('05 / 04'); //=> {month: 5, year: 2004} 
$('').payment('cardExpiryVal') //=> {month: 4, year: 2020} 

This function doesn't perform any validation of the month or year; use $.payment.validateCardExpiry(month, year) for that.

Array of objects that describe valid card types. Each object should contain the following fields:

  // Card type, as returned by $.payment.cardType. 
  type: 'mastercard',
  // Array of prefixes used to identify the card type. 
  patterns: [
      51, 52, 53, 54, 55,
      22, 23, 24, 25, 26, 27
  // Array of valid card number lengths. 
  length: [16],
  // Array of valid card CVC lengths. 
  cvcLength: [3],
  // Boolean indicating whether a valid card number should satisfy the Luhn check. 
  luhn: true,
  // Regex used to format the card number. Each match is joined with a space. 
  format: /(\d{1,4})/g

When identifying a card type, the array is traversed in order until the card number matches a prefix in patterns. For this reason, patterns with higher specificity should appear towards the beginning of the array.

Look in ./example/index.html

Run cake build

Run cake test

We recommend you turn autocomplete on for credit card forms, except for the CVC field (which should never be stored). You can do this by setting the autocomplete attribute:

<form autocomplete="on">
  <input class="cc-number" autocomplete="cc-number">
  <input class="cc-exp" autocomplete="cc-exp">
  <input class="cc-cvc" autocomplete="off">

You should mark up your fields using the Autofill spec. These are respected by a number of browsers, including Chrome, Safari, Firefox.

We recommend you to use <input type="tel"> which will cause the numeric keyboard to be displayed on mobile devices:

<input type="tel" class="cc-number">