express 4
sudo npm install -g express-generator
express -e microblog
npm install mongodb --save
npm install connect-mongo --save
npm install express-session --save
npm install connect-flash --save
brew install mongodb
mkdir -p data/db
mongod --dbpath data/db
DEBUG=microblog:* npm start
//or
NODE_ENV=production npm start
https://docs.mongodb.com/master/tutorial/install-mongodb-on-os-x/