alexander kindziora kindziora

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###Creating a REST API using Node.js, Express, and MongoDB

####Installing Node.js

Go to http://nodejs.org, and click the Install button. Run the installer that you just downloaded. When the installer completes, a message indicates that Node was installed at /usr/local/bin/node and npm was installed at /usr/local/bin/npm. At this point node.js is ready to use. Let’s implement the webserver application from the nodejs.org home page. We will use it as a starting point for our project: a RESTful API to access data (retrieve, create, update, delete) in a wine cellar database.

Create a folder named nodecellar anywhere on your file system. In the wincellar folder, create a file named server.js.

	'BAL#000': 'ADD_OVERFLOW',
	'BAL#001': 'SUB_OVERFLOW',
	'BAL#002': 'SUB_UNDERFLOW',
	'BAL#003': 'MUL_OVERFLOW',
	'BAL#004': 'ZERO_DIVISION',
	'BAL#005': 'DIV_INTERNAL',
	'BAL#006': 'X_OUT_OF_BOUNDS',
	'BAL#007': 'Y_OUT_OF_BOUNDS',
	'BAL#008': 'PRODUCT_OUT_OF_BOUNDS',
	'BAL#009': 'INVALID_EXPONENT',

	import pipeline, { Middleware } from './pipeline';

	const step1: Middleware<any, any> = (req, res, next) => {
	if (req.body) {
	console.log(`STEP 1: \n req: ${JSON.stringify(req)}\n res: ${JSON.stringify(res)}`);
	next();
	}
	}

	const step2: Middleware<any, any> = async (req, res, next) => {

	var simplerXHR = function( method, url) {
	var _xhr = new XMLHttpRequest();
	_xhr.open( method, url );
	_xhr.setup = function(cb){ // hacky? maybe
	cb(_xhr);
	return _xhr;
	};
	_xhr.done = function(cb){ // hacky? maybe
	_xhr.onreadystatechange = function() {
	if ( _xhr.readyState === 4 ) {