Blog
From the Flagify team
Engineering posts, product updates, and practical guides for shipping with feature flags.
Feature flag naming conventions that scale
Your flag names become the vocabulary of your releases. Here's how to name them so they're still readable when you have 100 of them.
Read postTesting code behind feature flags: strategies that work
Flagged code has two paths, which means twice as many tests. Here's how to structure them so you don't end up with a test suite you hate.
Read postFeature flags in Express: middleware patterns that actually work
Using feature flags in an Express app, with patterns for global middleware, per-route gates, and user-level evaluation. Real code, real trade-offs.
Read postUseful Cursor prompts for managing feature flags
A collection of practical Cursor prompts for creating, evaluating, and cleaning up feature flags with Flagify.
Read postHow to clean up feature flag technical debt
Stale feature flags accumulate. Here's a practical process to find them, remove them, and stop them from coming back.
Read postHow to use feature flags in NestJS
A practical guide to integrating Flagify into NestJS applications with dependency injection, route guards, and parameter decorators.
Read postA practical guide to canary releases with feature flags
Canary releases catch problems before they reach everyone. Here's how to run them with feature flags, and the metrics to watch during the rollout.
Read postFeature flags with Claude Code: a practical workflow
How to wire Flagify into Claude Code so your AI agent can create, toggle, and clean up feature flags without leaving the terminal.
Read postKill switches in software: the safety net every production app needs
A kill switch is a feature flag you hope to never flip. Here's how to design them, where to put them, and the mistakes to avoid.
Read postFeature flags in Next.js App Router
A working guide to using feature flags in Next.js 14+ with the App Router. Server components, client components, and the edge runtime.
Read postWhy Flagify Uses Deterministic Hashing for Rollouts
How Flagify evaluates percentage rollouts, why we chose stateless deterministic hashing, and why exact distribution is the wrong goal.
Read postBuild vs buy: should you build your own feature flag system?
You can build basic boolean flags in an afternoon. Here's when that stops working, and what it actually costs to get to production.
Read postWhen to use feature flags (and when not to)
Feature flags are not a hammer. Here's a practical list of when they help, when they don't, and when they actively cause problems.
Read postFeature toggle vs feature flag: is there actually a difference?
Short answer: no. Longer answer: the terms mean the same thing, but some teams use them differently. Here's what the naming actually signals.
Read postHow to use feature flags in React
A practical guide to integrating feature flags into React applications using Flagify's React SDK with hooks and context.
Read postFeature flag best practices for production
Practical guidelines for using feature flags without creating technical debt. Naming, lifecycle, cleanup, and common mistakes.
Read postIntroducing Flagify
Why we built a developer-first feature flag platform and what makes it different from the alternatives.
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