#Authentication

With 3 services needing separate logins, SSO unified authentication. One login grants access to everything.

Password resets were half my support tickets. Passkeys eliminate passwords entirely, but implementation is more complex than expected.

One week after launch, I got an angry email: 'I lost all my work because I was logged out!' The culprit was JWT expiration. I share the hard lessons learned about balancing security and UX, implementing Silent Refresh with Axios Interceptors, and choosing the right storage to prevent XSS attacks.

I thought adding a 'Login with Google' button would be easy. Instead, I faced Redirect URI errors, State parameters, and HTTPS issues. I share the 4-step 'dance' of OAuth 2.0, practical solutions with NextAuth.js, and how to handle mobile deep linking.

Users complained about getting logged out after I scaled the servers. Here's my journey from Sticky Sessions to Redis Store, and finally to JWT.

Clarifying the confusion between login and permission checks through real security incidents and the 'Airport Security' analogy. Deep dive into JWT structure, OAuth 2.0, and Authentication strategies in Microservices.

I share how I almost got hacked by protecting admin pages with `useEffect`. Learn why client-side protection is dangerous and how to use Next.js Middleware to securely protect routes at the server level, including a deep dive into Edge Runtime limitations.

Maintain login without session storage. Server just verifies token. The identity of Base64-encoded JSON. Why stateless scales better.