The Frontend Is a Privileged System Now
For years, frontend engineering had a comforting boundary. The backend held the real power: databases, payments, authorization, infrastructure, production secrets. The frontend rendered the interface. It ran in the browser, where users could inspect it, modify it, and ultimately distrust it. That model still contains an important truth. The browser is not a trusted environment. A serious authorization decision cannot depend on what a client-side application chooses to show or hide. ...