Export an OpenAPI specification from your FastAPI app

FastAPI is a modern Python web framework for building APIs. FastAPI is a great choice for building simple APIs, and it comes with built-in support for generating OpenAPI documentation.

In this post we will look at how to generate and extract the OpenAPI specification from a FastAPI project.

A simple single-file FastAPI example taken from the official docs will suffice as our testbed. The same workflow will also work for larger projects with routers.

Step 1: Add Tags and Metadata …

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