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What is XSS?Common Types of XSSPreventing XSSInput Validation and SanitizationExample – Client-Side ValidationExample – Server-Side (Express.js)Use Content Security Policy (CSP)Example – Set CSP in Express.jsSanitize with DOMPurifyUse Frameworks that Escape by DefaultExample – React JSXAvoid eval() and Similar APIsExample – Don't Do ThisAdd Secure HeadersWhat is CORS?How CORS WorksCommon CORS HeadersExample – Set CORS in Express.jsWhat is a Preflight Request?Example – Handling PreflightXSS vs CORS – What's the Difference?Final Thoughts