What is two-factor authentication (2FA) and how do I implement it in my app?Dec 16, 2024

I’ve seen two-factor authentication (2FA) on many websites, but I’m not sure how to implement it for my own web application. Can someone explain how to set it up securely?

Answers (1)
Harun KaranjaDec 17, 2024

2FA adds an extra layer of security by requiring users to verify their identity with two factors: something they know (password) and something they have (e.g., a code sent via SMS or an authentication app). To implement 2FA:

  • Use libraries like Google Authenticator or Twilio for SMS-based 2FA.
  • For app-based 2FA, consider using TOTP (Time-based One-Time Password) algorithms like Speakeasy in Node.js. Example using Speakeasy:
const speakeasy = require('speakeasy');
const secret = speakeasy.generateSecret();
console.log(secret.base32); // Store this in your database

Use the generated secret to verify the code entered by the user.

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