A demo of how to generate a TOTP

demo.js

import process from 'node:process'
import { TOTP } from 'totp-generator'

// You'd put this into secrets manager.
// This is a dummy value taken from
// https://github.com/bellstrand/totp-generator?tab=readme-ov-file#custom-token-settings
// for convenience.
const totpSecret = 'JBSWY3DPEHPK3PXP'

// Easy-to-use error handling
const bailout = (msg) => {
  console.error(msg)
  process.exit(-1)
}

// Make the token, but if it returns something naughty let's crash.
const totpToken =
  TOTP.generate(totpSecret)?.otp ??
  bailout(
    'Failed to get TOTP somehow?! The computer may be in the process of shutting down and/or detonation',
  )

// If you're still here, you've got a helpful TOTP!
console.log(`The code is «${totpToken}»`)