Flags SDK: feature flags for Next.js and SvelteKit

Flags SDK is a free, open-source library for using feature flags in Next.js and SvelteKit.
The SDK sits between your application and the source of your flags, helping you follow best practices and keep your website fast.
Use any flag provider, or none at all. Flexible integrations for your projects.
Integrate with App Router, Pages Router, and Routing Middleware.
Ideal for A/B testing and controlled rollouts. Experiment with confidence.
With a simple declarative API to define and use your feature flags.
man @vercel flags are so nice
Ngl the feature flag from @vercel is goated
i can ship my spaghetti to prod and have the entire team test without worrying about breaking things
no more "it worked on local/staging" but breaks in prod
Vercel's new Flags SDK is a brilliant show of taste in developer experience 💯
It introduces significant "artificial" limitations (server-only, no arguments at call site)—but those actually end up guiding users down the pit of success:
Congrats on the release! By far the best feature flags API 🔥
We use the Vercel flags in our project at work. We love it and people always compliment the power of it in demos