Verification code generator for Node.js

Simple library to generate verification codes without dependencies for Node.js.

This library utilizes in-built Node.js module crypto to effective random numeric sequences generation, but also you can implement your own function to generate random sequences, using simple contract: function (charCount: number <MAX 10>) => string

Minimal nodejs versions

From version 1.1.4 support of legacy nodejs was dropped. Now minimal version of nodejs is 14.

If you need this library for node 12 - please downgrade to version 1.1.2!

Usage

If digital codes is only what you need - just use shortcut getDigitalCode

const { getDigitalCode } = require('node-verification-code')
const smsVerificationCodeBuffer = getDigitalCode(4) // Will produce Buffer contains 4 random digits

// sendSms(phone, smsVerificationCodeBuffer.toString())

Own alphabet

Library is built on two entites:

• generator - function which generates Buffer with random content any length. It utilises sequence-function to produce random sequences
• sequence-function - function which provides sequence of random elements (up to 10 symbols)

Although sequence size is limited to 10 symbols, it doesn't mean you cannot generate longer codes. Generator will call sequence-function multiple times to get code with desired length.

So, to create own code generator you will need to create your own sequence-function. To do so you can simply use sequenceFromAlphabet shortcut as follows:

const { sequenceFromAlphabet, createGenerator } = require('node-verification-code')

// create sequence function
const emojiSequence = sequenceFromAlphabet(['🐶', '🐱', '🐭', '🐹', '🐰'])

// create generator from sequence function
const getEmojiCode = createGenerator(emojiSequence)

getEmojiCode(4).toString() // -> for example: 🐹🐭🐹🐰

Also, you can create your own sequence function by hand, just implement (number) => string contract and pass it to createGenerator:

const { createGenerator } = require('node-verification-code')

/*
  !!! only shown as example, don't do this in real code - crypto module produces better results

  Sequence-function contract implementation:
  (number) => string
*/
const mathRandomSequence = (charCount) => '0'.repeat(charCount).replaceAll('0', () => Math.floor(Math.random() * 10))

// Create code generator from sequence
const makeMyOwnVerificationCode = createGenerator(mathRandomSequence)

// Generate code
makeMyOwnVerificationCode(4).toString() // -> for example: '2108'

Install

npm install node-verification-code

Run tests

npm run test

Author

👤 Tominov Sergey

• Website: https://ikfi.ru
• Github: @ikenfin

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