server.js

var http = require('http'), 
    fs = require('fs'), 
    url = require('url'),
    port = 8080;

/* Global variables */
var listingData, server;


var requestHandler = function(request, response) {
  var parsedUrl = url.parse(request.url);
  
  /*
    Your request handler should send listingData in the JSON format if a GET request 
    is sent to the '/listings' path. Otherwise, it should send a 404 error. 

    HINT: explore the request object and its properties 
    http://stackoverflow.com/questions/17251553/nodejs-request-object-documentation
  */

  // GET request is sent to the 'listings' path.
  // Sent status code 200.
  if (parsedUrl.pathname === "/listings" ){
    response.writeHead(200,{'Content-Type' :'application/json'});
    response.write(listingData);
    response.end();
  }

  // Sent status code 404.
  else{
    response.writeHead(404);    
    response.write('Bad gateway error');
    response.end();
  }
};


fs.readFile('listings.json', 'utf8', function(err, data) {
  /*
    This callback function should save the data in the listingData variable, 
    then start the server. 
   */

  // Data is saved in a string buffer from the JSON object.
  listingData = JSON.stringify(JSON.parse(data));
  
  // Server gets created and start listening on the port.
  server = http.createServer(requestHandler);
  server.listen(port);
});