Naive Mapzen vector tiles proxy

proxy.js

var express = require("express"),
    cors = require("cors"),
    request = require("request"),
    path = require("path"),
    app = express();

// For ports
app.use(cors());

app.get("*",function(req, res){

  request.get("https://" + path.join("vector.mapzen.com",req.url),function(err,r,body){

    res.status(r.statusCode);

    if (r.statusCode !== 200) {
      return res.send(body || "");
    }

    var topo = JSON.parse(body);

    if ("buildings" in topo.objects) {

      topo.objects.buildings.geometries.forEach(function(geom){

        if (!geom.properties.id) {
          return;
        }

        // Add some properties here

      });
    }

    res.json(topo);

  });

});

app.listen(8888);