The React router has been packaged as a different module outside the React library. We can use the React router CDN at: https://cdnjs.cloudflare.com/ajax/libs/react-router/4.0.0-0/react-router.min.js .

We can include it in our project like this:

var { Router, Route, IndexRoute, Link, browserHistory } = ReactRouter 

Or we can use the npm package for React:

$ npm install --save react-router

Using an ES6 transpiler, like Babel:

import { Router, Route, Link } from 'react-router'

Not using an ES6 transpiler:

var Router = require('react-router').Router 
var Route = require('react-router').Route 
var Link = require('react-router').Link 

OK, now let's do the setup of our project and include the React router.