This was originally published on rollgate.io/blog/feature-flags-react . Why Feature Flags in React? Every React application reaches a point where you need to control what users see — without redeploying. Maybe you want to test a new checkout flow with 10% of users. Maybe you need a kill switch for a feature that's causing performance issues. Maybe your PM wants to launch a feature on Tuesday at 9am, not whenever the deploy pipeline finishes. Feature flags in React solve all of these problems. They let you wrap components, routes, or entire features behind a toggle that you control from a dashboard — no code changes, no redeployment, no downtime. If you've ever used an environment variable like NEXT_PUBLIC_ENABLE_NEW_UI and redeployed just to flip it, you already understand the concept. Feature flags are the same idea, but dynamic: you change the value in a dashboard, and every connected client picks it up in real time. In this guide, we'll go from zero to production-ready React feature flags in 5 minutes.…