genOTP


Generic 2FA OTP generator (OATH/HOTP, OATH/TOTP, mOTP)

Features

- RFC4226 (OATH/HOTP HMAC One-Time Password)
- RFC6238 (OATH/TOTP Time-Based One-Time Password)
- Mobile-OTP (mOTP https://motp.sourceforge.net/)

Last Updated

This README was last updated on 2025-03-19.

---

Installation

``bash
yarn add @multiotp/genotp
`

or

`bash
npm install --save @multiotp/genotp
`

Examples

`javascript
const OTP = require('./genotp')

let options = {
algorithm: 'sha1', //sha1 (sha256|sha512 will be implemented later)
bias: 0, // for TOTP and mOTP only, time bias, in seconds
counter: 0, // HOTP counter
digits: 6, // 6|8 (number of digits)
period: 30, // 30|60 (for TOTP only, in seconds)
pincode: '', // for mOTP only
secret: '3132333435363738393031323334353637383930',
seedtype: 'hex', // hex|base32|bin (secret seed format)
type: 'hotp', // totp|hotp|motp (otp type)
values: 1, // number of values to return
}

const otp = new OTP(options);

console.log(otp.generate());

`

`javascript
const OTP = require('./genotp')

const otp = new OTP();
console.log(otp.generate({type: 'hotp',
secret: '12345678901234567890',
seedtype: 'bin',
});
`

`javascript
const OTP = require('./genotp')

const otp = new OTP();
console.log(otp.generate({type: 'motp',
secret: '1234567890abcdef',
pincode: '1234',
});
``

---

Credits

Thanks to the following contributors:
- Erik Metz

License

This project is licensed under the LGPL-3.0-or-later license.