Autogenerating Clients with FastAPI and Github Actions

Handwritten JavaScript or TypeScript API clients can drift from backend changes and introduce errors such as missing parameters or outdated routes, especially as teams and client applications grow. OpenAPI addresses this by defining an API contract that can generate compatible servers and clients, while FastAPI offers a code-first alternative by automatically producing an OpenAPI specification from Python route definitions, including parameters and response schemas. This enables a workflow in which developers update backend routes first, derive the OpenAPI document from the running service, and then generate clients from that document. The process can be automated with GitHub Actions on every push by installing dependencies, starting the FastAPI server, downloading its openapi.json file, using OpenAPI Generator to create a TypeScript fetch client or other language-specific clients, and committing, publishing, or otherwise distributing the updated client.

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