card_number_validator 
CardNumberValidator provides methods to validate the most used card flags in the world. In addition, you can generate fake card numbers for development and tests purposes.
Installation
Add card_number_validator to Gemfile
Gemfile:
gem 'card_number_validator'Download and install by running:
bundle install
Usage
CardNumberValidator.flag(card_number)
Returns the flag name of the card or :unknown when the number is invalid.
See Example:
CardNumberValidator.flag('378282246310005') # :amex
CardNumberValidator.flag('30569309025904') # :diners
CardNumberValidator.flag('6363683839698868') # :elo
CardNumberValidator.flag('6062826289081176') # :hipercard
CardNumberValidator.flag('4012888888881881') # :visa
CardNumberValidator.flag('5223358786371817') # :mastercard
CardNumberValidator.flag('1111111111111111') # :unknownCardNumberValidator.valid?(card_number)
Checks if the given card number is valid or not.
See Example:
CardNumberValidator.valid?('378282246310005') # true
CardNumberValidator.valid?('30569309025904') # true
CardNumberValidator.valid?('6363683839698868') # true
CardNumberValidator.valid?('6062826289081176') # true
CardNumberValidator.valid?('4012888888881881') # true
CardNumberValidator.valid?('5223358786371817') # true
CardNumberValidator.valid?('1111111111111111') # falseCardNumberValidator.generate(:flag_name)
Returns a fake card number for the given flag name.
See Example:
CardNumberValidator.generate(:amex) # '378282246310005'String#card_flag
Returns the card flag for the given card number
See Example:
'378282246310005'.card_flag # :amex
'30569309025904'.card_flag # :diners
'6363683839698868'.card_flag # :elo
'6062826289081176'.card_flag # :hipercard
'4012888888881881'.card_flag # :visa
'5223358786371817'.card_flag # :mastercard
'1111111111111111'.card_flag # :unknownContributing
Card Validator is open source, and we are grateful for everyone who's contributed so far.
License
It is free software, and may be redistributed under the terms specified in the MIT-LICENSE file.
Feature Requests & Bugs
See http://github.com/pauloh-silva/card_number_validator/issues