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Flags SDK by Vercel - Free, open-source library for using feature flags in Next.js

by
Humans in the Loop
•
From the creators of Next.js, the Flags SDK is a free open-source library for implementing feature flags and A/B tests in your applications. Works with any flag provider or custom setup. Compatible with App Router, Pages Router, and Middleware.

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Best
fmerian
Hunter
📌

@Vercel is cooking.

@rauchg just announced Flags SDK, a free, open-source library for using feature flags in Next.js and SvelteKit. Compatible with App Router, Pages Router, and Middleware, Flags SDK works with many feature flag provider — @LaunchDarkly, @PostHog, @Hypertune, and more — or custom setup.

Happy shipping!

Shivam Singh

Vercel always keeps pushing the envelope! A free, open-source feature flag solution that works seamlessly with Next.js and SvelteKit is a solid win for developers.


Congrats on the launch!

Best wishes and sending lots of wins to the team :)

Matthew Wright

Cool launch!

Kay Kwak

Observing Vercel’s continuous growth and innovation is truly fascinating! Wish you good luck with the launch! 🎉

diana

Yesssss, Vercel for everything! And flags for everything within! I love a good release strat. Congrats on building something very core to the development process.

Yunxi Chang

Cool launch!

kevinito ryananda

That sounds like a great tool! The integration with App Router, Pages Router, and Middleware makes it very versatile for different project setups. I especially like that it supports any flag provider or custom setups, giving developers a lot of flexibility.

Zovie Hartwell

I found the Flags SDK by Vercel super handy—it makes feature flags and A/B testing in Next.js seamless, with great flexibility across setups.

Steven Langbroek

Has any consideration been made towards the OpenFeature project from the CNCF? How do you see the two? @rauchg ?

Dominik Ferber
Maker
@stevenlangbroek Yes, we are in touch with some folks at OpenFeature and will publish an adapter soon! Flags SDK solves how to best use flags in different frameworks, avoiding jank, integrating with dev tools. OpenFeature is focused on ease of switching providers but not opinionated on actual usage patterns. They are not in competition, although there is a bit of overlap in adapters. They can also be used together!