flatgeobuf/examples/node/index.js

import { readFileSync, writeFileSync } from 'node:fs';
import { geojson } from 'flatgeobuf';

const expected = {
    type: 'FeatureCollection',
    features: [
        {
            type: 'Feature',
            geometry: {
                type: 'Point',
                coordinates: [0, 0],
            },
        },
    ],
};

console.log('Input GeoJSON:');
console.log(JSON.stringify(expected, undefined, 1));

const flatgeobuf = geojson.serialize(expected);
console.log(`Serialized input GeoJson into FlatGeobuf (${flatgeobuf.length} bytes)`);

writeFileSync('/tmp/test.fgb', flatgeobuf);
const buffer = readFileSync('/tmp/test.fgb');
const actual = geojson.deserialize(new Uint8Array(buffer));

console.log('FlatGeobuf deserialized back into GeoJSON:');
console.log(JSON.stringify(actual, undefined, 1));