To hack on this first link the unpublished capitaljs:
# from your local capitaljs directory
$ npm link
# then cd into your capitaljs api directory and run
$ npm link capitaljs
To run the app, install dependencies and start the server:
npm install
npm start
Hitting http://localhost:3000/amortization?amount=180000&rate=4.25&totalTerm=360&amortizeTerm=60 in your browser should return return json with amortization calculations.