JavaScript Security: Secure Client-Side and Node.js Applications

As JavaScript continues to power both the frontend and backend of modern web applications, securing your code has never been more critical. Unresolved vulnerabilities can expose sensitive user data, compromise server integrity, and damage user trust. This course equips you with the foundational knowledge and practical skills to write secure JavaScript code and defend against common web vulnerabilities. You will transition from writing functional code to designing resilient, secure applications by understanding how attackers exploit weaknesses and how to stop them. What you'll learn: - Understand foundational web security concepts, including the Same-Origin Policy and the OWASP Top 10 vulnerabilities. - Prevent client-side attacks like Cross-Site Scripting (XSS) and Cross-Site Request Forgery (CSRF) using modern sanitization techniques. - Implement secure authentication and session management practices, including safe JSON Web Token (JWT) storage. - Configure robust security headers such as Content Security Policy (CSP) to restrict unauthorized resource execution. - Analyze and secure Node.js applications by addressing server-side injection and protecting environment variables. - Audit third-party dependencies using modern package manager tools to prevent supply-chain attacks. The journey begins with essential security terminology and foundational concepts before moving into step-by-step written walkthroughs of real-world vulnerability scenarios. You will read and analyze secure versus insecure code snippets, learning how to refactor applications for maximum defense. This course is designed for beginner developers, aspiring security analysts, and quality assurance professionals looking to build a strong foundation in application security. No prior security experience is required, though a basic familiarity with JavaScript syntax is helpful. Start reading today to build safer, more reliable web applications.