var VectorTileGenerator = require('vector-tiles-generator'); // initialize once your generator var vectorTileGenerator = new VectorTileGenerator({ pgPool: pool // you must provide your own pg-pool }); app.get('/layer/:z/:x/:y.mvt', function(req, res) { var tile = { x: parseInt(req.params.x), y: parseInt(req.params.y), z: parseInt(req.params.z) }; // nothing before zoom level 9 if(tile.z < 9) { return res.status(204).send(); // 204 empty status for mapbox } return vectorTileGenerator.get({ points: `SELECT name, ST_AsGeoJSON(ST_Transform(way, 4326)) as the_geom_geojson  FROM planet_osm_polygon WHERE way && !bbox!` // !bbox! will be replaced }, tile) .then(function(result) { if(!result || result.length === 0) { return res.status(204).send(); // handle empty status for mapbox } return res.send(result); }); });