Socket.IO Fiddle

$ docker-compose up -d      # start the Redis container
$ npm install               # install the dependencies
$ npm start                 # run the server
$ npm run client            # run the nodejs client
$ node emitter.js           # run the Redis emitter

And point your browser to http://localhost:3000. Optionally, specify a port by supplying the PORT env variable.