This is the React comment box example from the React tutorial. I've removed the base examples and re-written the example while following along with the tutorial.
Assuming you already have Node.js installed:
npm install node server.js
And visit http://localhost:3000/. Try opening multiple tabs!
You can change the port number by setting the
$PORT environment variable before invoking any of the scripts above, e.g.,
PORT=3001 node server.js