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fern

Instant Docs and SDKs for your API
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Fern SDK and Documentation Platform

Fern helps you deliver an exceptional developer experience with two powerful, fully integrated products:

SDKs

Generate production-ready SDKs that feel hand-written. Fern respects the idioms and conventions of each language. Supported today: TypeScript, Python, Go, Java, Ruby, C#, PHP, Swift, and Rust.

Docs

Publish beautiful, interactive API docs that developers enjoy using. Highlights include: docs-as-code, CI/CD pipeline to update API reference, RBAC for multiple audiences, and auto-populating API credentials.

Fern Docs work with OpenAPI (HTTP), AsyncAPI (WebSocket), and gRPC (Protobuf). Deployed on our cloud-hosted or self-hosted offerings.

Join the companies — like Square, ElevenLabs, and Adobe - that have chosen Fern as their preferred solution for SDK generation and API documentation.

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  1. fern fern Public

    Input OpenAPI. Output SDKs and Docs.

    TypeScript 3.4k 269

  2. docs-starter docs-starter Public template

    Publish beautiful documentation from OpenAPI and markdown (MDX)

    MDX 35 14

  3. docs docs Public

    The documentation for Fern (kind of meta, eh?)

    MDX 4 4

  4. fern-mcp-server fern-mcp-server Public

    Model Context Protocol (MCP) server for the Fern API.

    TypeScript 2 1

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