vector_tile_info.js

var request = require("request"),
    mapnik = require('mapnik'),
    zlib = require('zlib');

request({
  uri: "http://vector.mapzen.com/osm/all/17/66388/45097.mvt",
  // uri: "http://carto.data.gouv.fr/vector/all/17/66386/45096.mvt",
  encoding: null
}, function(error, resp, body) {
    var info, compression;
    console.log(resp.headers)
    if (resp.headers['content-encoding'] === 'gzip') compression = 'gunzip';
    else if (resp.headers['content-encoding'] === 'deflate') compression = 'inflate';
    else if (body && body[0] === 0x1F && body[1] === 0x8B) compression = 'gunzip';
    else if (body && body[0] === 0x78 && body[1] === 0x9C) compression = 'inflate';
    if (compression) {
        zlib[compression](body, function(err, data) {
            if (err) throw err;
            info = mapnik.VectorTile.info(data);
            console.log(info);
        });
    } else {
        var info = mapnik.VectorTile.info(body);
        console.log(info);
    }

});