steps
fork the repo to your github account clone to your machine change directory to barcode and run http server using command
cd barcode
python -m SimpleHTTPServer
open in Browser
Enter the barcode details. Try modifying the details in the json file. and see the changes are updted.
When running on codenvy.io, you can use these steps to create a tunnel to connect to the service you are running.
download ngrok and unzip
curl -o ngrok.zip unzip ngrok.zip
Run server on one terminal
python -m SimpleHTTPServer
Open new terminal
./ngrok http 8000