How to specify a port to run a create-react-app based project

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My project is based on create-react-app. npm start or yarn start by default will run the application on port 3000 and there is no option of specifying a port in the package.json.

How can I specify a port of my choice in this case? I want to run two of this project simultaneously (for testing), one in port 3005 and other is 3006

Jul 22, 2020 in Angular by kartik
• 37,480 points
1,377 views

1 answer to this question.

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Hello @kartik,

You could use cross-env to set the port, and it will work on Windows, Linux and Mac.

yarn add -D cross-env

then in package.json the start link could be like this:

"start": "cross-env PORT=3006 react-scripts start",\

Hope it helps!!
Thank you!!

answered Jul 22, 2020 by Niroj
• 82,540 points

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