Uvicorn colored output does not work on Windows

user_8605685 0
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I'm using fastapi in Python and want to run things like normal with Uvicorn. I did a full install of fastapi with pip install "fastapi[all]" but the Uvicorn colored terminal doesn't work in Command Prompt or Powershell:

enter image description here

Should look like:

enter image description here

I understand this is because Windows doesn't use the ANSI color sequences but the Uvicorn docs say it uses colorama to provide this support (which I've run separately and works).

As a workaround, I can run Uvicorn with the --no-use-colors flag to remove the color flags and make the output readable, but I'd really like coloring if possible.

uvicorn main:app --reload --no-use-colors

uvicorn fastapi ansi python
2 Answers

If you run uvicorn programmatically, importing colorama and initializing with:

import colorama
colorama.init()

before importing FastAPI seems to get colors working in cmd or powershell on Windows.

user_200202570

As cdoolin mentioned, you can use colorama. Alternatively, you can enable ANSI support permanently or pipe the output to Out-Host:

uvicorn main:app --reload --no-use-colors | Out-Host
user_198462190
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