Codv

Codv is a tiny library for generating arbitrary-sized codes with check digits.

Installation

yarn add codv

Usage

generateCode

Generates a random code.

import { generateCode } from 'codv'

const [code, checkDigits] = generateCode() // [ '25931', '49' ]

Parameters

• bodyLength: the length of the code's body. Default is 5.
• checkLength: the length of the code's check digits. Default is 2.

generateHexCode

Generates a random hexadecimal code.

The check digits of a hexadecimal code are still decimal values, as they are also generated with the same modulo 11 algorithm as the decimal codes.

import { generateHexCode } from 'codv'

const [code, checkDigits] = generateHexCode() // [ 'b5ac9', '26' ]

Parameters

• bodyLength: the length of the code's body. Default is 5.
• checkLength: the length of the code's check digits. Default is 2.

verifyCode

Verifies if a given a random code (decimal or hexadecimal) is valid.

import { verifyCode } from 'codv'

const code = verifyCode('25931', '49') // true

Parameters

• body: The code's body.
• checkDigits: The check digits to validate against the body.

Example

Codv utilizes the modulo 11 algorithm for calculating the check digits, this is the same algorithm used by the CPF and a lot of other identifications numbers worldwide.

Generating a valid random CPF

import { generateCode } from 'codv'

const cpf = generateCode(9, 2)

console.log(cpf) // [ '471896067', '34' ]

Verifying a CPF

import { verifyCode } from './verifyCode'

console.log(verifyCode('471896067', '34')) // true
console.log(verifyCode('471896067', '35')) // false

Browser usage

<script src="https://unpkg.com/[email protected]/dist/bundle.js"></script>

Then:

Codv.generateCode() // (2) [ "83087", "99" ]