predownload.js

const fs = require('fs');
const https = require('https');
const csv = require('csvtojson');

if (!fs.existsSync('temp')) {
    fs.mkdirSync('temp');
}

// download whole world airport
if (!fs.existsSync('temp/airports.json')) {
    https.get("https://raw.githubusercontent.com/davidmegginson/ourairports-data/main/airports.csv", (response) => {
        response.on('end', function () {
            csv()
                .fromFile('temp/airports.csv')
                .then((jsonObj) => {
                    fs.writeFileSync('temp/airports.json', JSON.stringify(jsonObj, null, '\t'));
                })
        });
        response.pipe(fs.createWriteStream('temp/airports.csv'));
    });
}

// download fir boundary
if (!fs.existsSync('temp/boundaries.json')) {
    https.get("https://raw.githubusercontent.com/vatsimnetwork/vatspy-data-project/master/Boundaries.geojson", (response) => {
        response.pipe(fs.createWriteStream('temp/boundaries.json'));
    });
}