index.js

'use strict';

if (!process.env.API_KEY) {
  console.warn('API_KEY must be defined as an environment variable');
  process.exit();
}

var bby = require('bestbuy')(process.env.API_KEY);
var async = require('async');
var _ = require('lodash');

var startTime = new Date();
var foundProducts = 0;
var queryParams = {show: 'salePrice,name,url', pageSize: 100, cursorMark: '*'};
var hasMoreProducts = true;
async.whilst(
  function () { return hasMoreProducts; },
  function (callback) {
    bby.products('', queryParams, function(err, data) {
      if (err) return callback(err);

      if (data.total === 0 || queryParams.cursorMark === data.nextCursorMark) {
        hasMoreProducts = false;
      } else {
        queryParams.cursorMark = data.nextCursorMark;
        _.each(data.products, function(product) {
          foundProducts++;
        });
        console.log('[%dms] Retreived %d products', new Date() - startTime, foundProducts);
      }
      return callback();
    });
  },
  function (err) {
    if (err) throw err;
    else console.log('All done!');
  }
);

package.json

{
  "name": "cursor-sample",
  "version": "0.0.1",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "",
  "license": "MIT",
  "dependencies": {
    "async": "^2.1.4",
    "bestbuy": "^1.0.0",
    "lodash": "^4.17.3"
  }
}