one-time password (OTP) generator

🔐 Deno/Bun/Node/Browser module for TOTP and HOTP generator based on RFC 6238 and RFC 4226 🗝️

• Zero dependencies: Works seamlessly across different environments without requiring additional libraries.
• Supports TOTP and HOTP: Generate both time-based and counter-based one-time passwords

Try it out on JSFiddle: Live Demo

Install

npm i one-time-pass

Usage

Import

import { generateTOTP } from "one-time-pass";
// Deno 
import { generateTOTP } from "npm:one-time-pass";
// Nodejs
const { generateTOTP } = require("one-time-pass");

// Or include it via CDN
<script src="https://cdn.jsdelivr.net/npm/one-time-pass/dist/index.umd.js"></script>

window.otp.generateTOTP("key");

Examples

generate TOTP

import { generateTOTP } from "one-time-pass";

(async () => {

  const defaultOptions = {
    hash: 'SHA-1',
    timeStep: 30, // epoch interval
    digits: 6,
    timestamp: Date.now()
  }

  const code = await generateTOTP("key", defaultOptions?);
  console.log(code);
})();

generate HOTP

import { generateHOTP } from "one-time-pass";

(async () => {
  const counter = 14653;
  const hash = "SHA-1";
  const digits = 6;

  const code = await generateHOTP("secretKey", counter, hash, digits);
  console.log(code);
})();

Ressouces

• rfc6238
• rfc4226

Notes

• We welcome pull requests! Feel free to contribute to this project.

Author

• Haikel Fazzani

License

GNU GENERAL PUBLIC LICENSE V3