FastAPI: Documenting Additional API Responses
Document every possible API response, not just the happy path. The `responses` decorator parameter lets you define alternative status codes and schemas, like a 404 error model, making your OpenAPI docs complete.
Go beyond the default 200 OK. FastAPI's `responses` decorator parameter lets you explicitly document every possible outcome, like a 404 Not Found or a 202 Accepted, with its own schema. This makes your OpenAPI docs truly complete for consumers. The footgun: for these additional responses, you must return a direct `Response` object (e.g., `JSONResponse`) with the correct status code. Returning a simple dictionary will result in a misleading 200 OK.
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