Google Authenticator integration with Spring Boot

Google Authenticator Integration with Spring Boot Passwords alone just don't cut it anymore. We've all seen the headlines — data breaches, credential stuffing, account takeovers. And yet, a shocking number of applications still rely on a single password as the only line of defense. If you're building something with Spring Boot and haven't wired up multi-factor authentication yet, this guide is for you. We'll walk through integrating Google Authenticator into a Spring Boot project — step by step, with real code. By the end, your users will need both their password and a time-sensitive code from their phone to get in. That's a meaningful security upgrade. What Exactly Is MFA — and Why Should You Care? Multi-factor authentication (MFA) — sometimes called two-factor authentication or 2FA — is the practice of requiring more than one proof of identity before granting access. Instead of just "something you know" (your password), you add "something you have