Fern is a platform that automatically generates type-safe SDKs and beautiful documentation from API definitions in minutes.
About Fern
Fern is a comprehensive API tooling platform that transforms API specifications into production-ready developer resources. It takes your existing API definitions and automatically generates type-safe SDKs in multiple programming languages, creates interactive documentation with API references, and provides AI-powered search capabilities. Fern supports major API specifications including OpenAPI, AsyncAPI, Protobuf, and OpenRPC, making it a versatile solution for API-first development teams looking to streamline their developer experience and reduce manual SDK maintenance overhead.
Key Features
- Generate type-safe SDKs in TypeScript, Python, Java, Go, Ruby, PHP, and C#
- Create interactive developer documentation with auto-generated API and SDK references
- AI-powered search assistant trained on your documentation, APIs, and SDKs
- Support for multiple API specifications including OpenAPI, AsyncAPI, Protobuf, and OpenRPC
- Automated SDK generation and maintenance from API definitions
- Production-ready output that integrates seamlessly into existing workflows