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If your JWT is in localStorage, your users are at risk. 🔓 In Day 68, we harden our authentication system by migrating from insecure storage to HTTP-Only Cookies. This is the gold standard for web security, preventing Cross-Site Scripting (XSS) attacks from stealing user sessions. We are solving the tricky part of full-stack development: making Cookies work across different origins (Next.js on port 3000 ↔️ FastAPI on port 8000). 💡 In this live build: The Vulnerability: Why localStorage is dangerous for sensitive tokens. Backend Setup: Modifying FastAPI to set HttpOnly; Secure; SameSite cookies automatically. CORS Hell: Configuring Access-Control-Allow-Credentials so the browser actually accepts the cookie. Frontend Integration: Teaching Next.js (Axios/Fetch) to send credentials with every request. The Logout Flow: How to securely invalidate the cookie from the server side. By the end, your authentication will be banking-grade secure. 📘 Watch the full playlist: 👉 https://www.youtube.com/playlist?list=PLdtwawCR2QjmdfhM-7SzDOVGop373bbgW 📂 GitHub Repo (Public Mirror): 👉 https://github.com/KNehe/aero_bound_ventures-public.git 🔥 Subscribe to master Full Stack Security. #FastAPI #NextJS #WebSecurity #Cookies #Authentication #XSS #FullStack
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