How to implement automatic generation of API documents and UI display in FastAPI

How to implement automatic generation of API documents and UI display in FastAPI

With a powerful Python framework like FastAPI, we can easily build high-performance Web APIs. However, while building an API, we also need a clear and easy-to-understand API documentation to help other developers understand and use our API. This article will introduce how to use FastAPI to automatically generate API documents and display them through the UI.

First, we need to install FastAPI and related dependent libraries. Run the following command in the command line to install them:

pip install fastapi
pip install uvicorn
pip install fastapi_utils

Next, we need to import the necessary modules:

from fastapi import FastAPI
from fastapi_utils.api_model import APIModel
from fastapi_utils.api_doc import APIModelDoc

Then, we create an instance of FastAPI:

app = FastAPI()

Next, we can define an API model. The API model is defined using the APIModel class provided by FastAPI, which can contain fields for API requests and responses.

class User(APIModel):
    id: int
    name: str
    email: str

In our FastAPI application, we can use this model to define API routing and logic.

@app.get("/users/{user_id}", response_model=User, summary="Get user by ID", tags=["users"])
def get_user(user_id: int):
    return {"id": user_id, "name": "John Doe", "email": "johndoe@example.com"}

In the above code, we define a route /users/{user_id} for the HTTP GET request, and specify the response model as User. We also added a brief description and a label to the route, which we can later use to organize and filter the API documentation.

Next, we can use the APIModelDoc class to generate documentation for our API model.

docs = APIModelDoc(app)
docs.register(User)

With the above code, our API model is registered in the API document.

Finally, we need to use the docs.html method to get the HTML code of the automatically generated API documentation.

@api.route('/docs', method="GET", tags=["docs"])
def get_docs():
    return docs.html()

In the above code, we define a GET route /docs and return the HTML code of the automatically generated API documentation. Here we have added a tag docs to this route for filtering and organizing within the API documentation.

Now, let’s run our FastAPI application and view the automatically generated API documentation.

if __name__ == "__main__":
    uvicorn.run(app, host="0.0.0.0", port=8000)

Execute the following command in the command line to start the application:

python app.py

Then visit http://localhost:8000/docs in the browser and you should You can see the automatically generated API documentation.

Through the above steps, we successfully implemented the automatic generation and UI display of API documents in FastAPI. You can further customize and adjust the style and content of the API documentation to your needs.

Hope this article helps you build a powerful API using FastAPI and provides clear and easy-to-understand documentation for your API.

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