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bouncy.js

// # Bouncy

var bouncy = require('bouncy')
  , fs     = require('fs')
  , path   = require('path');

fs.watchFile(path.join(__dirname, 'servers.json'), function(curr, prev) {
  console.log("Watching servers.json");
  if (curr.mtime.getTime() !== prev.mtime.getTime()) {
    bouncy(function(req, bounce) {
      console.log("Host: ", req.headers.host);
      // Run through each property and value
      fs.readFile(path.join(__dirname, 'servers.json'), 'utf8', function(err, data) {
        if (err) {
          console.log(err);
        } else {
          var servers = JSON.parse(data);
          console.log(servers);
          if (req.headers.host in servers) {
            bounce(servers[req.headers.host]);
          } else {
            bounce(8081);
          }
        }
      });
    }).listen(8000);
  }
});