Fern

Platform that turns OpenAPI/AsyncAPI definitions into type-safe SDKs and hosted API documentation

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Fern is a platform that converts OpenAPI, AsyncAPI, Protobuf, or OpenRPC API definitions into production-ready SDKs and developer documentation. Its CLI generates type-safe client libraries in languages such as TypeScript, Python, Java, Go, Ruby, PHP, and C#, and can host a documentation site with search and an AI assistant trained on the company's docs. It targets API and platform teams that need SDKs and docs without building the tooling themselves.

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