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About Fern API

Fern is a platform that automates the generation of client libraries (SDKs) and comprehensive API documentation directly from your API specification. It supports various formats like OpenAPI, AsyncAPI, OpenRPC, gRPC, and its own Fern Definition. The generated SDKs are designed to be language-native, type-safe, and include features like OAuth 2.0, server-sent events, and automatic pagination, saving engineering time and improving developer experience. Beyond SDK generation, Fern also provides a robust documentation platform. This platform allows users to create stunning, SEO-optimized API docs with features like API key injection, access control, versioning, and interactive API explorers. It supports customization with JavaScript, CSS, and React components, and even includes an AI assistant trained on your documentation. Fern aims to streamline the process of making APIs consumable and delightful for developers, reducing the manual effort involved in maintaining SDKs and documentation. This tool is ideal for companies and development teams looking to improve the developer experience of their APIs by providing high-quality, automatically generated SDKs and interactive documentation. It helps reduce the overhead of maintaining client libraries across multiple languages and ensures documentation is always up-to-date with the API.