Fern

Fern SDK Generation

Capability area (CLI/platform, not a hosted REST API) that generates idiomatic, type-safe client SDKs in TypeScript, Python, Go, Java, C#, PHP, Ruby, Swift, and Rust from OpenAPI, AsyncAPI, gRPC, or Fern Definition input. Driven by `fern generate`; SDKs are published to GitHub and registries (npm, PyPI, Maven). Endpoints are modeled from the CLI surface rather than a public REST API.

GitHub

Documentation

📖
Documentation
https://buildwithfern.com/learn/sdks/overview
📖
APIReference
https://buildwithfern.com/learn/cli-api-reference/cli-reference/commands

Other Resources

🔗
SourceCode
https://github.com/fern-api/fern
🔗
APIsJSON
https://raw.githubusercontent.com/api-evangelist/fern-api/refs/heads/main/apis.yml

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API entry from apis.yml

apis.yml Raw ↑ 
aid: fern-api:fern-api-sdk-generation
name: Fern SDK Generation
tags:
- SDK Generation
- Client Library
- Developer Tools
- API Lifecycle
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
humanURL: https://buildwithfern.com/learn/sdks/overview
properties:
- url: https://buildwithfern.com/learn/sdks/overview
  type: Documentation
- url: https://buildwithfern.com/learn/cli-api-reference/cli-reference/commands
  type: APIReference
- url: https://github.com/fern-api/fern
  type: SourceCode
description: Capability area (CLI/platform, not a hosted REST API) that generates idiomatic, type-safe
  client SDKs in TypeScript, Python, Go, Java, C#, PHP, Ruby, Swift, and Rust from OpenAPI, AsyncAPI,
  gRPC, or Fern Definition input. Driven by `fern generate`; SDKs are published to GitHub and registries
  (npm, PyPI, Maven). Endpoints are modeled from the CLI surface rather than a public REST API.