bp-creditcards

Utility methods for formatting and validating credit cards

Usage no npm install needed!

<script type="module">
  import bpCreditcards from 'https://cdn.skypack.dev/bp-creditcards';
</script>

README

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Utility methods for formatting and validating credit cards. With a minimal footprint and a flexible API, it's suitable for both Node and the browser.

Install

# npm
$ npm install creditcards
# bower
$ bower install creditcards

API

validate(card)

  • Arguments:
    • card (object)
      • number (string)
      • expirationMonth (number)
      • expirationYear (number)
      • cvc (string)
  • Returns:
    • object
      • card
        • type (string) - the type of the provided card
        • number (string)
        • expirationMonth (number)
        • expirationYear (number)
        • cvc (string)
      • validCardNumber (boolean)
      • validExpirationMonth (boolean)
      • validExpirationYear (boolean)
      • validCvc (boolean)
      • expired (boolean) - whether the expiration date has passed

card

card.parse(number) -> String

Removes all non-numeric characters from a card number, including punctuation and spacing. If a non-string is provided, it returns an empty string.

card.type(number) -> String

Returns the matched card type, or undefined if there was no match. Valid card types are:

  • Visa
  • MasterCard
  • American Express
  • Diners Club
  • Discover
  • JCB

card.luhn(number) -> Boolean

Checks the card number's validity using the Luhn algorithm.

card.isValid(number [, type]) -> Boolean

Validates the number using card.luhn and checks that it matches any type (or a specific type if provided).

cvc

isValid(cvc [, type]) -> Boolean

Checks whether a card verification code is a valid 3-4 digit numeric string. If a type is provided, the length will be validated for the card type (4 for American Express, 3 for others).

expiration

isPast(month, year) -> Boolean

Checks whether a given month and year pair (both Number) are in the past.

expiration.month

expiration.month.parse(month) -> Number

Casts the provided month value to a Number. All of the following will be 5 after parsing:

  • 5
  • '05'
  • '5'

Returns undefined for non-numeric values.

expiration.month.isValid(month) -> Boolean

Checks whether the provided month (Number) is valid (between 1 and 12).

expiration.year

expiration.year.parse(year [, pad]) -> Number

Casts the provided year value to a Number. If pad is true, year is assumed to be a two digit number or numeric string. All of the following are equivalent:

  • expiration.year.parse(2014)
  • expiration.year.parse('2014')
  • expiration.year.parse('14', true)
  • expiration.year.parse(14, true)

Returns undefined for non-numeric values.

expiration.year.format(year [, strip]) -> Number

Casts the provided year (Number) to a String. If strip is true, year is assumed to be a four digit number and will be converted to a two digit number.

  • expiration.year.format(2014) === '2014'
  • expiration.year.format(2014, true) === '14'

expiration.year.isValid(year) -> Boolean

Checks whether the provided year (Number) is valid (> 0).

expiration.year.isPast(year) -> Boolean

Checks whether a given year (Number) is in the past.

Why Another Library?

There are lots of other useful credit card validation and parsing modules. creditcards specifically takes inspiration from credit-card, but there are many others, including the popular jQuery.payment. creditcards was specifically designed for browser use for handling payment forms. That means:

  1. Browserified, it's only a few kilobytes, even before minification.
  2. It provides an API for parsing user inputs.
  3. It has no DOM-related code. You can use it in Node and in the browser you get full control over how your card inputs are handled.
  4. The card type is optional.

Clients

  • angular-credit-cards: A set of Angular directives for building credit card forms powered by creditcards

License

MIT