Luhn

This package is a port of a very good existing package called fast-luhn created by @cybermatt.

It runs in NodeJs/Browser environments through WebAssembly, with very good speed and contains the necessary functions to work with the luhn algorithm quickly and efficiently.

Overview

Below is an overview of the package.

Install

Package can be installed using npm cli

npm i @credit-card-stuffs/luhn

Import

You can import like any other npm package

import luhn from "@credit-card-stuffs/luhn"

Validate

Check if string is valid by luhn algorithm. Return bool.

luhn.validate("471629309440")
// false

Digit

Calculate next digit for string of numbers. Return int.

luhn.digit("47162930944")
// 7

Complete

Add luhn-check digit to string of numbers. Return string.

luhn.complete("2398560146")
// 23985601469

Generate

Generate luhn-valid string of numbers with length. Return string.

luhn.generate(50)
// 04648626855744999947592497373533751558978979404719

Tests

Tests can be run with command

$ cargo test

Building

You can build the package from source code

Dependencies

First of all you need to resolve some dependencies to get started.

• 1. Rust
• 2. NodeJs
• 3. Wasm-pack

Build

$ git clone https://github.com/credit-card-stuffs/luhn
$ cd luhn
$ wasm-pack build --target nodejs

After that you should see a folder called pkg/ in which it contains the generated Js files.