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Phase 10 · Authentication & Authorization

Topics

Multi-Factor Authentication

Part of the Backend Developer Roadmap.

Summary

Requiring a second proof of identity beyond a password — typically a time-based one-time code (TOTP) from an authenticator app — significantly reducing account takeover risk.

How to Learn This

  • 1Implement TOTP-based MFA using a library like `speakeasy` or `otplib`.
  • 2Generate a QR code so users can add your app to Google Authenticator.
  • 3Design backup codes for when a user loses access to their authenticator.

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API Keys

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Single Sign-On (SSO)

More topics in Authentication & Authorization

SessionsJWTOAuth 2.0Passport.jsPassword Hashing (bcrypt)Role-Based Access Control (RBAC)Refresh TokensSocial Login (Google/GitHub)API KeysSingle Sign-On (SSO)
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