Fern is a powerful tool designed to generate SDKs and documentation for APIs. It excels in parsing OpenAPI or AsyncAPI formats to automatically produce SDKs in multiple programming languages, including JavaScript, Python, Go, .NET, Java, and Ruby. For greater customization, users can utilize Fern’s proprietary definition format, which can also be exported to OpenAPI. The tool simplifies the process of publishing SDKs by supporting auto-publication to popular package registries such as npm, PyPI, NuGet, and Maven Central. Additionally, Fern generates changelogs and integrates seamlessly with pull request reviews, enhancing the development workflow.
However, the tool currently lacks support for PHP, Swift, Rust, and Terraform. Despite this limitation, Fern is praised for its ability to significantly speed up API development and improve the quality of generated SDKs, making it a preferred choice among developers.
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