npm install geo-coder --save-dev

global.fetch = require('node-fetch');   // set fetch for nodeJS
var GeoCode = require('geo-coder').GeoCode;
var geoCode = new GeoCode();
// geolookup example
geocode.geolookup('Brampton, Canada').then(result => {
  console.log(result))  //  [ { source: 'OpenStreetMap', lng: -79.752502, lat: 43.715783,..}]
});
// reverse lookup example
geocode.reverse(43.653226, -79.3831843).then(result => {
  console.log(result) // {source: 'OpenStreetMap', address: 'Brampton, ON'...}
});

<script src="https://unpkg.com/geo-coder"></script>

var geoCode = new GeoCode();
// geolookup example
geoCode.geolookup('Brampton, Canada').then(result => {
  console.log(result);
});
// reverse lookup example
geoCode.reverse(43.653226, -79.3831843).then(result => {
  console.log(result);
});

var googleGeoCode   = new GeoCode('google', { key: 'g0o...' });
var bingGeoCode     = new GeoCode('bing',   { key: 'b1n...' });
var opencageGeoCode = new GeoCode('opencage',   { key: 'op3...' });