How to Build a Production-Ready Feature Flag System with Next.js and Supabase

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How to Build a Production-Ready Feature Flag System with Next.js and Supabase
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Feature flags are powerful tools that let you control which features are visible to users without deploying new code. They enable gradual rollouts, A/B testing, and instant feature toggles, which are all essential for modern software development. In this article, we’ll build a real, production-ready feature flag system, not just a simple boolean toggle. Specifically, we’ll implement: A global on/off flag to enable or disable features instantly User-specific flags to grant access to individual users (for beta testing or internal users) Percentage-based rollouts to gradually expose features to a subset of users A React-powered admin dashboard to manage flags without redeploying Client-side and server-side enforcement, so features are gated consistently everywhere By the end, we’ll finish by wiring a real Todo feature behind a feature flag, showing how entire pages and components can be safely toggled on and off in production. Table of Contents What Are Feature Flags...

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