Fern
Generate SDKs and API docs from your OpenAPI spec
Launched 26 months agobuildwithfern.com
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About Fern
Fern is a platform that generates client SDKs and API documentation from OpenAPI specifications. It is aimed at API companies that want SDKs and docs their customers can rely on, instead of code that is hand-maintained and falls out of sync. Fern produces type-safe SDKs for TypeScript, Python, Java, Go, Ruby and C#, with pagination, retries and streaming built in. The documentation includes an API reference, guides and an AI-powered search assistant. It supports REST through OpenAPI, WebSockets through AsyncAPI and gRPC through Protobuf. The listing says companies including Cohere, ElevenLabs and Merge use Fern, and the product is listed as free to use.
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