npm install add-commasAdd commas to a number
Core logic adapted from this thread on Stack Overflow
``
var addCommas = require('add-commas');
// yes
addCommas(12345); // 12,345
addCommas('12345'); // 12,345
// no
addCommas(); // throws Error
addCommas(123.45) // throws Error
addCommas('dogs') // throws Error
``
Go nuts.