Example node scraper, runs as cronjob every 15 minutes

scraper.js

var request = require('request');
    cheerio = require('cheerio');
    util = require('util');    
    http = require('http');
    cronJob = require('cron').CronJob;

var data = new Array();

new cronJob('*/15 * * * * *', function(){
  

  request('http://www.gunbot.net/index2.php?cal=9mm', function(error, response, body) {
    var $ = cheerio.load(body, { ignoreWhitespace: true, xmlMode: true });
  
    $('tr').each(function(i, html) {
      var cells = $(html).find('td');
      var price = $(cells[1]).text().trim().replace(/\/rd/g,'');
      var seller = $(cells[4]).text().trim().replace(/\[+(.*?)\]+/g,'$1');
      var description = $(cells[0]).text().trim()
      if (price != "") {
        var obj={}
        obj[seller] = [price, description]
        data.push(obj)
      };    
    });
  });
}, null, true, "America/Los_Angeles");

http.createServer(function (req, res) {
  res.writeHead(200, {'Content-Type': 'text/plain'});
  res.writeHead(200, {'Content-Type': 'text/plain'});
  res.write(JSON.stringify(data))


  res.end();
}).listen(8000);

  util.puts('> gunbot scraper running on port 8000');