aid: fern
name: Fern
description: >-
  Fern allows developers to instantly transform your OpenAPI into SDKs and Docs.
  Engineering teams build with Fern to offer a best-in-class developer
  experience. Stripe, Twilio, and AWS have the resources to invest in internal
  tooling for developer experience. They provide SDKs (aka client libraries) in
  multiple languages and developer documentation that stays up-to-date. We are
  building Fern to productize this process and make it accessible to all
  software companies.
image: https://kinlane-productions.s3.amazonaws.com/apis-json/apis-json-logo.jpg
url: >-
  https://raw.githubusercontent.com/api-evangelist/fern/refs/heads/main/apis.yml
created: '2025-01-08'
modified: '2026-04-18'
specificationVersion: '0.19'
type: Contract
access: 3rd-Party
position: Consuming
tags:
  - AI
  - API Definitions
  - Code Generation
  - Developer Experience
  - Documentation
  - OpenAPI
  - Platform
  - SDKs
segments:
  - SDKs
  - Documentation
  - API Definitions
  - Developer Experience
  - Code Generation
apis:
  - aid: fern:fern
    name: Fern
    description: >-
      We use Fern to autogenerate our Python and Node API clients from our
      OpenAPI spec. The clients are high quality, easy to update, and the Fern
      team moves blazing fast.
    humanURL: https://buildwithfern.com/
    tags:
      - AI
      - API Definitions
      - Code Generation
      - Developer Experience
      - Documentation
      - OpenAPI
      - Platform
      - SDKs
    properties:
      - type: Documentation
        url: https://buildwithfern.com/
      - type: GettingStarted
        url: https://buildwithfern.com/learn/docs/getting-started/overview
      - type: SDK
        url: https://buildwithfern.com/learn/sdks/overview/introduction
      - type: APIReference
        url: https://buildwithfern.com/learn/docs/api-references/generate-api-ref
common:
  - type: GitHubOrganization
    url: https://github.com/fern-api
  - type: Branding
    url: https://brandfetch.com/buildwithfern.com
  - type: Documentation
    url: https://buildwithfern.com/learn
  - type: CLI
    url: https://buildwithfern.com/learn/cli-reference/overview
  - type: Customers
    url: https://www.buildwithfern.com/showcase
  - type: Pricing
    url: https://www.buildwithfern.com/pricing
  - type: Blog
    url: https://www.buildwithfern.com/blog
  - type: Support
    url: https://buildwithfern.com/learn#get-support
  - type: PrivacyPolicy
    url: https://www.buildwithfern.com/privacy-policy
  - type: TermsOfService
    url: https://www.buildwithfern.com/terms-of-service
  - type: GettingStarted
    url: https://buildwithfern.com/learn/docs/getting-started/quickstart
  - type: GitHubRepository
    url: https://github.com/fern-api/fern
  - type: Login
    url: https://dashboard.buildwithfern.com/login
  - type: SignUp
    url: https://dashboard.buildwithfern.com/login
  - type: X
    url: https://x.com/buildwithfern
  - type: LinkedIn
    url: https://www.linkedin.com/company/buildwithfern
  - type: TrustCenter
    url: https://security.buildwithfern.com/
  - type: Features
    data:
      - name: SDK Generation
        description: Generate production-ready SDKs in TypeScript, Python, Go, Java, C#, PHP, Ruby, Swift, and Rust from OpenAPI specs.
      - name: API Documentation
        description: Auto-generate beautiful, branded API documentation with interactive examples and playground.
      - name: Ask AI
        description: AI-powered documentation chatbot that answers developer questions using your API docs as context.
      - name: Fern Definition Language
        description: Purpose-built API definition language as an alternative to OpenAPI for defining API contracts.
      - name: OpenAPI Support
        description: First-class OpenAPI specification support for both SDK generation and documentation.
      - name: Versioning
        description: Built-in API versioning support for documentation and SDK generation across multiple API versions.
  - type: UseCases
    data:
      - name: SDK Generation from OpenAPI
        description: Transform OpenAPI specifications into idiomatic client libraries across multiple programming languages.
      - name: Developer Documentation
        description: Generate and host interactive API documentation with custom branding and domain support.
      - name: API-First Development
        description: Define APIs using Fern Definition Language and generate server stubs, SDKs, and documentation.
      - name: SDK Maintenance Automation
        description: Automatically update and publish SDKs when API specifications change, reducing maintenance burden.
      - name: Developer Portal Creation
        description: Build comprehensive developer portals with guides, API references, and SDK documentation.
  - type: Integrations
    data:
      - name: GitHub Actions
        description: CI/CD integration for automatically generating and publishing SDKs on API specification changes.
      - name: npm Registry
        description: Automatic publishing of generated TypeScript/JavaScript SDKs to the npm package registry.
      - name: PyPI
        description: Automatic publishing of generated Python SDKs to the Python Package Index.
      - name: Maven Central
        description: Automatic publishing of generated Java SDKs to Maven Central repository.
      - name: NuGet
        description: Automatic publishing of generated C# SDKs to the NuGet package registry.
maintainers:
  - FN: Kin Lane
    email: kin@apievangelist.com