map.js

/**
 * Module dependencies.
 */

var express = require('express');

var app = express.createServer();

function params(req, res, next) {
  var obj = {}
    , params = req.params[0].split('/');
  for (var i = 0, len = params.length; i < len; i += 2) {
    obj[params.shift()] = params.shift();
  }
  req.query = obj;
  next();
}

app.get('/shoes/*', params, function(req, res){
  res.send('searching ' + req.query.type + ' shoes, with size ' + req.query.size);
});

app.listen(3000);