This page details all the generators you can specify in your generators.yml.

All of our generators are open source.

​
fern-typescript-node-sdk

Source code

The TypeScript Node SDK generator outputs a fully functional TypeScript/JavaScript SDK for server-side usage. It can publish the SDK to npmjs.org (or any other npm repository).

​
Config options

  • namespaceExport: Allows you to control the name of the generated namespace export and client class.
generators.yml
- name: fernapi/fern-typescript-node-sdk
  version: 0.7.2
  output:
    location: npm
    package-name: "@fern-api/plantstore"
    token: ${NPM_TOKEN}
  config: # optional
    namespaceExport: PlantStore
  github:
    repository: fern-api/plantstore-node

​
fern-typescript-browser-sdk

Source code

The TypeScript Node SDK generator outputs a fully functional TypeScript/JavaScript SDK for usage in the browser. It can publish the SDK to npmjs.org (or any other npm repository).

​
Config options

  • namespaceExport: Allows you to control the name of the generated namespace export and client class.
generators.yml
- name: fernapi/fern-typescript-browser-sdk
  version: 0.7.2
  output:
    location: npm
    package-name: "@fern-api/plantstore"
    token: ${NPM_TOKEN}
  config: # optional
    namespaceExport: PlantStore
  github:
    repository: fern-api/plantstore-node

​
fern-typescript-express

Source code

The Express generator generates types and networking logic for your Express server. This saves you time and add compile-time safety that you are serving the exact API that you specified in your Fern Definition.

⚠️ Make sure to enable allowSyntheticDefaultImports in your tsconfig.json when using this generator.

generators.yml
- name: fernapi/fern-typescript-express
  version: 0.7.2
  output:
    location: local-file-system
    path: ../../generated/express

​
fern-python-sdk

Source code

The Python SDK generator outputs a fully functional Python SDK. It can publish the SDK to pypi.org (or any other pypi repository).

generators.yml
- name: fernapi/fern-python-sdk
  version: 0.4.0
  output:
    location: pypi
    package-name: fern-plantstore
    token: ${PYPI_TOKEN}
  github:
    repository: fern-api/plantstore-python

​
fern-java-sdk

Source code

The Java SDK generator outputs a fully functional Java SDK. It can publish the SDK to Maven Central (or any other Maven repository).

generators.yml
- name: fernapi/fern-java-sdk
  version: 0.4.3
  output:
    location: maven
    coordinate: io.github.fern-api:plantstore
    username: ${MAVEN_USERNAME}
    password: ${MAVEN_PASSWORD}
  github:
    repository: fern-api/plantstore-java

​
fern-go-sdk

Source code

The Go SDK generator outputs a fully functional Go SDK. It can publish the SDK to GitHub.

generators.yml
- name: fernapi/fern-go-sdk
  version: 0.2.0
  github:
    repository: fern-api/plantstore-go

​
fern-postman

Source code

The Postman generator outputs a Postman Collection (in Postman’s collection.json format). The generator can sync the collection with your Postman Workspace.

generators.yml
- name: fernapi/fern-postman
  version: 0.0.44
  output:
    location: postman
    api-key: ${POSTMAN_API_KEY}
    workspace-id: ${POSTMAN_WORKSPACE_ID}
  github:
    repository: fern-api/plantstore-postman

To find your workspace ID, select the ⓘ icon in the top right of the workspace view.

Postman Workspace ID

​
fern-fastapi-server

Source code

The FastAPI generator outputs lots of helpful code for implementing your FastAPI backend:

  • Abstract classes that register your endpoints with FastAPI and handle all the networking logic.
  • Pydantic models for all the types in your API.
  • Exceptions that extend HTTPException that you can throw from wherever. These exceptions handle serialization and setting the HTTP status code.
generators.yml
- name: fernapi/fern-fastapi-server
  version: 0.4.0
  output:
    location: local-file-system
    path: ../../src/venus/generated/server

​
fern-pydantic-model

Source code

The Pydantic Model generator outputs Pydantic Models for all the types in your API. This saves you time and ensures your backend types align with your SDKs.

generators.yml
- name: fernapi/fern-pydantic-model
  version: 0.4.0
  output:
    location: local-file-system
    path: ../../src/venus/generated/server

​
fern-openapi

Source code

The OpenAPI generator outputs an OpenAPI 3.1 document for your API. You can feed it into any OpenAPI-compatible tools, like documentation providers.

​
Config options

  • format: Either "yaml" or "json". Defaults to "yaml".
generators.yml
- name: fernapi/fern-openapi
  version: 0.0.28
  config: # optional
    format: yaml
  github:
    repository: fern-api/plantstore-openapi