https://github.com/bendrucker/fast-luhn

A fast Luhn algorithm for validating credit cards
https://github.com/bendrucker/fast-luhn

Last synced: 11 months ago
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A fast Luhn algorithm for validating credit cards

• Host: GitHub
• URL: https://github.com/bendrucker/fast-luhn
• Owner: bendrucker
• License: mit
• Created: 2015-03-30T14:20:29.000Z (over 11 years ago)
• Default Branch: master
• Last Pushed: 2025-08-13T20:45:20.000Z (11 months ago)
• Last Synced: 2025-08-23T12:43:27.900Z (11 months ago)
• Language: JavaScript
• Size: 38.1 KB
• Stars: 79
• Watchers: 4
• Forks: 9
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: license

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README

          
# fast-luhn [![tests](https://github.com/bendrucker/fast-luhn/workflows/tests/badge.svg)](https://github.com/bendrucker/fast-luhn/actions?query=workflow%3Atests)

> A fast [Luhn](http://en.wikipedia.org/wiki/Luhn_algorithm) algorithm for validating credit cards. Adapted from [ShirtlessKirk's popular gist](https://gist.github.com/ShirtlessKirk/2134376). 

## Installing

```sh

$ npm install fast-luhn

```

## API

#### `luhn(number)` -> `Boolean`

Returns `true`/`false` depending on whether the Luhn checksum is valid

##### number

*Required*  

Type: `string`

A credit card number.

## License

MIT © [Ben Drucker](http://bendrucker.me)