check-luhn

bank card number luhn check

Install

npm install check-luhn
# or
yarn add check-luhn

Example

const check = require('check-luhn')
const correct_card = '6225365271562822'
const incorrect_card = '6225365271562823'

check(correct_card) // true
check(incorrect_card) // false

Command line

G:\my-pkg\check-luhn>check-luhn 6225365271562822
true

G:\my-pkg\check-luhn>check-luhn 6225365271562999
false

G:\my-pkg\check-luhn>check-luhn 6225365271562822 6225365271562822 6225365271562822
true

G:\my-pkg\check-luhn>check-luhn 6225365271562822 6225365271562822 6225369999999999
false

Performance

> 5,400,000 ops/sec in Intel Core i5-4460 (Windows 7 64bit, Node v8.11.3 64bit)
> 14,900,000 ops/sec using fast_toNumberArray in Intel Core i5-4460 (Windows 7 64bit, Node v8.11.3 64bit)

C:\Users\vec\Desktop\check-luhn>node benchmark.js
check-luhn#CorrectCard x 5,475,450 ops/sec ±0.13% (97 runs sampled)
check-luhn#IncorrectCard x 5,655,244 ops/sec ±0.35% (96 runs sampled)

Fastest is check-luhn#IncorrectCard

check-luhn#CorrectCard with fast_toNumberArray x 14,943,990 ops/sec ±0.33% (92 runs sampled)
check-luhn#IncorrectCard with fast_toNumberArray x 14,949,358 ops/sec ±0.11% (94 runs sampled)

Fastest is check-luhn#IncorrectCard with fast_toNumberArray