otplib, generate uri (for a qr code), which works for both Google Authenticator and Microsoft Authenticator

generate-secret-and-link.js

const { authenticator } = require('otplib')
const crypto = require('crypto')

authenticator.options = { crypto }

const rawSecret = crypto.randomBytes(32).toString('hex').substr(0, 20)
const secret = authenticator.encode(rawSecret)
console.log('secret', secret)
console.log('url', authenticator.keyuri('[email protected]', 'testing-otplib', secret))

generate-token.js

const { authenticator } = require('otplib')
const crypto = require('crypto')

authenticator.options = { crypto }

const secret = 'LE5ACX24MIUQQUA6' // example secret, replace with whatever the previous script produced
console.log('token', authenticator.generate(secret))