If brew, and you have old node (currently node should be between .6 and .7):
brew remove node
brew install node

If not:
https://github.com/joyent/node/wiki/Installing-Node.js-via-package-manager

Then:
curl http://npmjs.org/install.sh | sh

verify both:
node -v
npm -v

Then cd /restclient.
npm install -d

once installed:
node app.js

then hit 127.0.0.1:3000