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

To specify a port to run a create-react-app based project, we can use the PORT environment variable. Here’s how we can do it:

1. Open our project’s package.json file.
2. Find the "scripts" section.
3. Modify the "start" script to include the PORT environment variable. It should look something like this:

"scripts": {
  "start": "PORT=3001 react-scripts start",
  ...
}

In this example, the port is set to 3001, but we can replace it with any port number we prefer.

Alternatively, we can specify the port directly in the command line when we run the npm start command:

PORT=3001 npm start

This will start our create-react-app based project on port 3001. Adjust the port number as needed for our project.