python start a fastapi server using uvicorn. TLDR oneliner

how to start FastAPI server with Uvicorn Python one-liner 2025

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Run a Server Manually - FastAPI
When you install FastAPI, it comes with a production server, Uvicorn, and you can start it with the fastapi run command. But you can also install an ASGI server ...
Fastapi
2
FastAPI, uvicorn.run() always create 3 instances, but I want it 1 ...
First, you run main.py that go through the all code (one creation of FastAPI object), and then reach the __main__; Then uvicorn launch main:app ...
Stack Overflow

To start a FastAPI server using Uvicorn in one line, you can run the following command in your terminal:

uvicorn main:app --reload

Explanation

  • main: This refers to the Python file (without the .py extension) where your FastAPI application is defined.
  • app: This refers to the FastAPI instance created inside that file, typically defined with app = FastAPI().
  • --reload: This option enables automatic reload of the server whenever you make changes to the code, which is useful during development.

This one-liner efficiently sets up your FastAPI server and is commonly used for development purposes, as noted in the FastAPI documentation FastAPI.

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When you install FastAPI, it comes with a production server, Uvicorn, and you can start it with the fastapi run command. But you can also install an ASGI server ...

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First, you run main.py that go through the all code (one creation of FastAPI object), and then reach the __main__; Then uvicorn launch main:app ...

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Code-Based Server Initialization | CodeSignal Learn
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Learn how to configure and run the FastAPI server directly through a Python script. This approach offers a more integrated way to start your server.

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main : the file main.py (the Python "module"). · app : the object created inside of main.py with the line app = FastAPI() . · --reload : make the ...

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Building an API using FastAPI and Uvicorn · Install Required Libraries · Define the API Endpoints · Run the API · Test the API.

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To get started, in this section, you will create a minimal FastAPI app, run it with a server using Uvicorn, and then learn all the interacting parts. This will ...

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I tried to integrate the uvicorn with FastApi inside my application having uvicorn run as a thread like I do when I'm was using flask (that ...