Glossary term
What is MFA / 2FA? Meaning for developers
MFA / 2FA stands for Multi-Factor / Two-Factor Authentication.
Requires more than a password. Example: Password + code from an app.
Learn it properly · System DesignLesson 49: Authentication vs Authorization: Sessions, Cookies & JWTEvery endpoint checked “is the user logged in?” — and changing one number in the URL showed another customer's invoice. Authentication vs authorization, storing passwords, MFA and passkeys, sessions vs JWTs (with a live token to tamper with), and RBAC, ABAC and ReBAC.