Production-ready SDKs for your API
Fern is built for developers and open source
Whether you call them SDKs, client libraries, bindings, or wrappers,
Fern generates prewritten code that developers can use to
build client applications more easily.
Trusted in production
What you get
Fern is designed to be extensible, allowing you to add custom logic in each SDK.
Start in 3 steps
Bring your API.
Select your generators.
Release your artifacts.
Loved by developers
We’re huge fans of Fern here at Vellum! We use Fern to autogenerate our Python and Node API clients from our OpenAPI spec. The clients are high quality, easy to update, and the Fern team moves blazing fast on feature requests.
I really dislike most autogenerated code, but Fern’s genuinely feels like we have a developer writing it - would highly recommend.
Fern sped up new API development by at least 50%. The bits sped up are the most tedious, annoying parts.
I investigated how my engineering team should go about offering SDKs (Node, Python, Java, etc.) My recommendation was "Fern... please".