$ npm list react
my-react-app@0.1.0 /path/to/my-react-app
└── react@17.0.2

import React from 'react';

console.log(React.version); // Output: "17.0.2"

{
  "name": "my-react-app",
  "version": "0.1.0",
  "dependencies": {
    "react": "^17.0.2",
    "react-dom": "^17.0.2",
    "react-scripts": "4.0.3"
  }
}