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reactjscreate-react-app

where does create-react-app specify which port to run on

My question isn't how to change which port create-react-app runs on.

My question is where does create-react-app specify port 3000.

I don't want to change it I just want to understand how it sets it.

I've searched for 3000 but it just comes up in a bunch of comments not the actual setting.

Is it in compiled code some where? Do I need to unpack it?

Solution

  • The default port is set in the start script of react-scripts here:

    const DEFAULT_PORT = parseInt(process.env.PORT, 10) || 3000;