Convert a directory of vector tiles to GeoJSON.

convert_vector_tiles_to_geojson.js

const fs = require('fs');
const vt2geojson = require('@mapbox/vt2geojson');
const glob = require('glob');

glob('tiles/**/*.pbf', {}, function (er, files) {
  files.forEach((path) => {
    const [_, z, x, y] = path.match(/^tiles\/(\d+)\/(\d+)\/(\d+)\.pbf/);
    console.log(`x: ${x}`);

    vt2geojson({
      uri: `tiles/${z}/${x}/${y}.pbf`,
      layer: 'no2',
      z,
      x,
      y,
    }, function (err, result) {
      if (err) throw err;
      fs.writeFileSync(`tiles/${z}/${x}/${y}.geojson`, JSON.stringify(result));
      console.log(`Wrote tiles/${z}/${x}/${y}.geojson.`)
    });
  })
})