fern-api ☆
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Description:
Stripe-level SDKs and Docs for your API
Type: Formula  |  Latest Version: 3.31.2@0  |  Tracked Since: Dec 17, 2025
Links: Homepage  |  formulae.brew.sh
Category: Developer tools
Tags: sdk api documentation code-generation developer-tools
Install: brew install fern-api
About:
Fern is a toolchain for generating SDKs, documentation, and Postman collections from an API definition. It ensures your client libraries and docs stay perfectly in sync with your API, reducing maintenance overhead and improving the developer experience for your users.
Key Features:
  • Generates typed, idiomatic client libraries in multiple languages (e.g., Python, TypeScript, Java, Go)
  • Outputs beautiful, interactive API documentation with an embedded API explorer
  • Creates a Postman collection for easy API testing and collaboration
  • Driven by a simple, human-readable Fern definition (YAML or OpenAPI)
Use Cases:
  • Automating the creation and maintenance of SDKs for a public or internal API
  • Generating and hosting a developer portal or API documentation site
  • Ensuring consistency between API documentation, SDKs, and the backend implementation
Alternatives:
  • OpenAPI Generator – Open-source and highly configurable, but can be complex to set up and maintain; Fern provides a more opinionated, managed experience.
  • Speakeasy – A direct commercial competitor offering similar SDK and documentation generation capabilities.
Version History
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Dec 24, 2025 7:58pm 3.31.2 0 VERSION_BUMP aa905781
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