Can't resolve 'react-router' code example

Example 1: Module not found: Can't resolve 'react-router-dom'

npm install react-router-dom --save

Example 2: Can't resolve 'react-router-dom'

$ npm install --save react-router-dom

Example 3: Module not found: Can't resolve 'react-router-dom'

npm i react-router-dom --save

Example 4: react router install

// How to work with react router dom in react-web
import {
  BrowserRouter as Router,
  StaticRouter, // for server rendering
  Route,
  Link
  // etc.
} from "react-router-dom";