Foundations of Secure JavaScript Programming

Building modern web applications requires a deep understanding of how to protect user data and secure your code against malicious attacks. This course provides a clear, step-by-step introduction to JavaScript security, helping you identify and mitigate vulnerabilities across both browser-based and Node.js environments. By reading this course, you will transition from writing functional JavaScript to writing secure, resilient code. You will understand how web browsers handle security, how to implement modern authentication practices safely, and how to defend your server-side Node.js applications from common exploits. What you'll learn: - Understand foundational security concepts, including the Same-Origin Policy, CORS, and browser security models - Implement secure authentication flows using modern token-based practices and safe cookie configurations like HttpOnly and SameSite - Prevent common web vulnerabilities such as Cross-Site Scripting (XSS) and Cross-Site Request Forgery (CSRF) using modern sanitization techniques - Secure Node.js backend applications by managing environment variables safely and validating user inputs - Apply basic security linting and dependency scanning tools to automatically detect vulnerabilities in your codebase We begin with essential security terminology and browser mechanics, establishing a strong conceptual base before moving into practical coding practices, secure authentication design, and Node.js backend protection. This course is designed for beginner developers and programmers who want to build a strong foundation in web security. No prior security experience is required. Start reading today to build safer, more secure web applications.