Card Validator

Generic helpers for card number, expiry and CVV validations

Usage:

Import the library and initialize card object.

Install from npm:

npm i @juspay/simple-card-validator --save

var cardValidator = require('simple-card-validator');

Or, you can simply use the file from dist/validator.js if you are not using node/npm.

var card = new cardValidator('4242-4242-4242-4242');

Getting card details

card.getCardDetails(); This would output, card brand and different validation outputs like below:

{ card_type: 'visa',
  valid: true,
  luhn_valid: true,
  length_valid: true,
  cvv_length: [ 3 ],
  gaps: [ 4, 8, 12 ],
  supported_lengths: [ 16 ],
  max_length: 16 }

Output format

| Field | Description | Type | | ----------------- | ------------------------------------- | ----------------- | | card_type | The card issuer for the provided card | String | | valid | Are the card details valid | Boolean | | luhn_valid | Is the card number valid | Boolean | | length_valid | If the card number length is valid | Boolean | | cvv_length | If the CVV/CAVV length is valid | Array [ Integer ] | | gaps | Gaps for UI as printed in cards | Array [ Integer ] | | supported_lengths | Supported lengths for the card type | Array [ Integer ] | | max_length | Maximum length for the card type | Integer |

Validations

To simply validate a card, call: card.validateCard(); The result will be a validity boolean.

For validating expiry date, card.validateExpiry('12/2018');

Additionally, the base date can be set for expiry validations. The base month and date can be provided by using, card.setBaseDate(month, year);

eg: card.setBaseDate('02', '2016');

For validating CVV, use: card.validateCvv(111); CVV will be validated based on the brand of the card.

Contribution

Read through the development guidelines.

License

MIT license. Copyright © 2018 - juspay.in.