You're looking for the StaticFiles utility:
from fastapi import FastAPI
from fastapi.staticfiles import StaticFiles
app = FastAPI()
app.mount("/", StaticFiles(directory="static"), name="static")
Arguments usage is documented on FastAPI documentation:
- The first - "/"refers to the path this "sub-application" will be "mounted" on. Kn this case, all paths will be handled by it.
 
- The - directory="static"refers to the name of the directory that contains your static files on your local filesystem.
 
- The - name="static"gives it a name that can be used internally by FastAPI.
 
All these parameters can be different than "static", adjust them with the needs and specific details of your own application.
Note: You will need to install aiofiles: pip install aiofiles