Stop Using LocalStorage! | HTTP-Only Cookies (FastAPI + Next.js) | Flight Booking Engine | Day 68
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: 👉 • FastAPI & Next.js project: Flight Booking ...
📂 GitHub Repo (Public Mirror): 👉 https://github.com/KNehe/aero_bound_v...
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