One of the most important, yet often underrated, topics in frontend security is Content Security Policy (CSP) . You can think of CSP as a set of instructions you give the browser, telling it what is allowed to run and what should be blocked . Let's break it down. What is CSP? Content Security Policy (CSP) is an HTTP response header that you configure on your server to tell the browser which sources are trusted for loading resources such as: JavaScript CSS Ima...