Fern automates SDK generation and documentation for APIs, supporting OpenAPI, Swagger, and AsyncAPI specifications.

Screenshot of Fern website

Fern is a powerful tool that streamlines the process of creating SDKs and documentation for APIs. It supports popular API specification formats like OpenAPI, Swagger, and AsyncAPI, making it versatile for various API projects.

Key features of Fern include:

  • Automated SDK Generation: Fern generates idiomatic client libraries in popular programming languages, saving developers time and effort.
  • Beautiful Documentation: It creates a visually appealing documentation website with an exceptional API reference, automatically updating as your API changes.
  • Language Support: Fern offers SDK generation for TypeScript, Python, Java, Go, Ruby, C#, and Swift.
  • Seamless Integration: The tool integrates easily into CI/CD pipelines and offers a GitHub app for automatic SDK updates.
  • Customization Options: Developers can add custom code to enrich the generated SDKs and tailor them to specific needs.
  • Advanced Features: Fern supports server-sent events, webhooks, and provides robust type safety and retry logic in generated SDKs.

Benefits for development teams:

  • Time-saving: Automates the tedious process of creating and maintaining SDKs and documentation.
  • Consistency: Ensures that SDKs and documentation are always in sync with the latest API changes.
  • Quality: Produces high-quality, idiomatic code that feels hand-written by experts in each language.
  • Developer Experience: Improves the overall developer experience for API consumers with comprehensive, up-to-date resources.

Fern is trusted by companies like Webflow, Cohere, and ElevenLabs, making it a reliable choice for teams looking to streamline their API development workflow and provide a superior experience for their API users.