See it online here.
This guide assumes you already have MongoDB and NodeJS installed.
Clone the repository
# Get the latest version
git clone git@github.com:jmcriffey/es6-fiddle-web.git
# Change directory
cd es6-fiddle-web
# Install Npm dependencies
npm Install
# Add a MONGOHQ_URL to your environment
export MONGOHQ_URL='mongodb://localhost:27017/fiddles'
# Open a new terminal window and start MongoDB
mongod
# Start the application
npm start