Pendule

Time-based one-time passcodes (TOTP) for the web

npm install @hazae41/pendule

📦 NPM

Features

Current features

• 100% TypeScript and ESM
• Minimal dependencies
• SHA-1 TOTP

Usage

SHA-1 TOTP

Parse generator secret

const totp = Sha1Totp.parseOrThrow("JBSWY3DPEHPK3PXP")

Parse generator url

const totp = Sha1Totp.parseOrThrow("otpauth://totp/?secret=AAAABBBB22223333YYYYZZZZ66667777")

Codes

Generate the current code

const code = await totp.generate()

Automatically update code (with a margin of error of 1 second)

setInterval(() => {
  code = await totp.generate()
}, 1000)

Log codes every time there is a new one

const period = totp.period * 1000

const elapsed = Date.now() % period

const remaining = period - elapsed

setTimeout(() => {
  console.log(await totp.generate())

  setInterval(() => {
    console.log(await totp.generate())
  }, period)

  // New codes will now be displayed
}, remaining)