Node.js, MongoDB, and AngularJS Web Development

Starting the Express Server

To implement Express as the HTTP server for a Node.js application, you need to create an instance and begin listening on a port. The following three lines of code start a very rudimentary Express server listening on port 8080:

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var express = require('express');var app = express();app.listen(8080);

The app.listen(port) call binds the underlying HTTP connection to the port and begins listening on it. The underlying HTTP connection is the same connection produced using the listen() method on a Server object created using the http library discussed in Chapter 7 “Implementing HTTP Services in Node.js.”

In fact, the value returned by express() is actually a callback function that maps to the ...