FastAPI simple block of code not working

[ShaunMostert]

Question: I don’t have the most experience with FastAPI in Python and I would like to know why this block of code just instantly stops after it is ran

from fastapi import FastAPI

app = FastAPI()


@app.get("/")
async def root():
    return {"message": "Hello World"}

If you could just explain why and leave a block of code for me underneath thanks!

[Firepup650]

You never start the app, so it will immediately exit due to there being no code to run. After your last line of code setting up routes, you need a line like app.run() (which is flask, I don’t know if that’s right for FastAPI).

[UMARismyname]

try after adding

import uvicorn 

if __name__ == "__main__":
    uvicorn.run("main.app:app", host="0.0.0.0", reload=True)

[ShaunMostert]

Thank you