Secure Web Authentication: Cookies, JWTs, and Local Storage

When building modern web applications, choosing the wrong storage mechanism for user sessions can expose your entire system to critical security vulnerabilities like Cross-Site Scripting (XSS) and Cross-Site Request Forgery (CSRF).\n\nThis text-only course guides you through the fundamental trade-offs of storing sensitive authentication tokens, helping you make informed architecture decisions that protect your users.\n\nWhat you'll learn:\n- Understand the core differences between HTTP cookies, localStorage, and sessionStorage\n- Analyze the security risks of JSON Web Tokens (JWTs) when stored in browser-based storage\n- Mitigate common web vulnerabilities including XSS, CSRF, and session hijacking\n- Implement modern security measures like HttpOnly, Secure, and SameSite cookie attributes\n- Explore modern token rotation strategies and secure authentication flows for Single Page Applications (SPAs)\n- Practice evaluating web security architectures through clear, written scenario analyses\n\nYou will start with the absolute basics of web state management and browser storage APIs before diving deep into threat modeling, token storage trade-offs, and modern defensive strategies. This course is designed for beginner web developers, security enthusiasts, and software engineering students looking to build secure authentication systems. No advanced security background is required.\n\nBegin reading today to build safer, more resilient web applications.