How Your Web App Leaks User Data via Third-Party Scripts

Episode 60 of The Web Development Podcast digs into a hidden privacy & performance issue: third-party scripts that exfiltrate user data from your web app in plain sight. Lucas and Luna use a real-world case—a mock e-commerce site loading a tracking script from a seemingly reputable CDN—to show how a single fetch call can silently leak browsing history, cart contents, and even keystrokes. They walk through code examples using the Network tab, explain how subresource integrity (SRI) fails when scripts are dynamically appended, and demonstrate a fix using Content Security Policy (CSP) with script-src and nonce. The episode also covers how to audit existing dependencies with tools like Lighthouse and Sentry. No alarmism—just practical steps to protect users. If today's tech conversation gave you something usable, consider supporting the show at buy me a coffee dot com slash fexingo. #ThirdPartyScripts #DataLeak #WebSecurity #ContentSecurityPolicy #SubresourceIntegrity #CSP #SRI #Privacy #JavaScript #WebDev #Frontend #Performance #Audit #Lighthouse #Sentry #Technology #FexingoBusiness #BusinessPodcast Keep every episode free: buymeacoffee.com/fexingo