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Copy the following command into your terminal. The only prerequisite is Node 16+.

npx counterfact@latest https://petstore3.swagger.io/api/v3/openapi.json api

What does that command do?

1. installs the @latest version of counterfact
2. reads an OpenAPI 3 document (https://petstore3.swagger.io/api/v3/openapi.json)
3. generates TypeScript files in the api directory
4. starts a server which implements the API

You can use Swagger UI to try out the auto-generated API. Out of the box, it returns random responses using metadata from the OpenAPI document. Edit the files under ./api/routes to add more realistic behavior. There's no need to restart the server.

To learn more, see the Usage Guide.