Programming Tutorials

  The Reality of Client-Side Storage It is 2025, and we still see Senior Developers storing Access Tokens in  localStorage . Let’s be unequivocal:  localStorage  is not a secure vault.  It is a global key-value store accessible by any JavaScript executing on your origin. If your application has a single XSS vulnerability—whether through a compromised npm package, a rogue third-party analytics script, or improper input sanitization—your user's entire identity is compromised. The attacker simply reads  localStorage.getItem('accessToken')  and sends it to their server. However, the alternative—standard HttpOnly cookies—introduces friction for mobile applications (which prefer Authorization headers) and requires strict CSRF mitigation strategies. The architectural compromise that satisfies strict security requirements while remaining platform-agnostic is  Refresh Token Rotation (RTR) with Reuse Detection , backed by Redis. The Root Cause: Why Stateles...