Overview of API References
Fern generates interactive API Reference documentation from an OpenAPI specification or other API formats. Endpoints, type schemas, code snippets, and AI-generated examples are all populated automatically. Users can try requests directly from the docs with the API Explorer, and AI agents and crawlers can discover your APIs via the API catalog endpoint.
Pick your API type
REST
OpenAPI specification
gRPC
Protocol Buffer .proto files
WebSocket
AsyncAPI specification
Webhook
OpenAPI specification
OpenRPC
OpenRPC specification
GraphQL
GraphQL schema
Library
Python or C++ source code