A very simple node.js server for serving vector tiles from an mbtiles file

index.js

var express = require("express"),
    app = express(),
    MBTiles = require('mbtiles'),
    p = require("path");

// Enable CORS and set correct mime type/content encoding
var header = {
  "Access-Control-Allow-Origin":"*",
  "Access-Control-Allow-Headers":"Origin, X-Requested-With, Content-Type, Accept",
  "Content-Type":"application/x-protobuf",
  "Content-Encoding":"gzip"
};

// Route which handles requests like the following: /<mbtiles-name>/0/1/2.pbf
app.get('/:source/:z/:x/:y.pbf', function(req, res) {
  new MBTiles(p.join(__dirname, req.params.source + '.mbtiles'), function(err, mbtiles) {
    mbtiles.getTile(req.params.z, req.params.x, req.params.y, function(err, tile, headers) {
      if (err) {
        res.set({"Content-Type": "text/plain"});
        res.status(404).send('Tile rendering error: ' + err + '\n');
      } else {
        res.set(header);
        res.send(tile);
      }
    });
    if (err) console.log("error opening database");
  });
});

// Starts up the server on port 3000
console.log('Listening on port: ' + 3000);
app.listen(3000);