FastAPI stands on the shoulders of giants:

• Starlette for the web parts.
• Pydantic for the data parts.

Create a virtual environment.

$ py -3 -m venv your_env_name 

Invoke the virtual environment.

$ your_env_name\Scripts\activate.bat

Download all packages found in the requirements.txt file

$ pip install -r requirements.txt

Make a .env file (use .env.sample as an example). Fill in the values.

$ touch .env

Run the server with:

$ uvicorn app.main:app --reload

INFO:     Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
INFO:     Started reloader process [28720]
INFO:     Started server process [28722]
INFO:     Waiting for application startup.
INFO:     Application startup complete.

Open your browser at http://127.0.0.1:8000.

You will see the JSON response as:

{"message": "Welcome to my post application"}

Now go to http://127.0.0.1:8000/docs.

You will see the automatic interactive API documentation (provided by Swagger UI):

And now, go to http://127.0.0.1:8000/redoc.

You will see the alternative automatic documentation (provided by ReDoc):