map1.html

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title>Display a map on a webpage</title>
    <meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no">
    <link href="https://api.mapbox.com/mapbox-gl-js/v2.8.2/mapbox-gl.css" rel="stylesheet">
    <script src="https://api.mapbox.com/mapbox-gl-js/v2.8.2/mapbox-gl.js"></script>
    <style>
        body { margin: 0; padding: 0; }
        #map { position: absolute; top: 0; bottom: 0; width: 100%; }
    </style>
</head>
<body>
<div id="map"></div>
<script src="js/map1.js"></script>
<script>
    mapboxgl.accessToken = 'pk.eyJ1IjoiY2p1NzExIiwiYSI6ImNsM2Q1emV0aTA1OXMzaXFwbWcyanAwMXUifQ.67ZAGBIXYXWd5XvRzNIHtw';
    const map = new mapboxgl.Map({
        container: 'map', // container ID
        style: 'mapbox://styles/mapbox/streets-v11', // style URL
        center: [-74.5, 40], // starting position [lng, lat]
        zoom: 9 // starting zoom
    });

    var url = '/findiss';

    map.on('load', function() {
        window.setInterval(function () {

        }, 2000);

        map.addSource('iss', {type: 'geojson', data: url});
        map.addLayer({
            "id": "iss",
            "type": "symbol",
            "source": "iss",
            "layout": {
                "icon-image": "rocket-15"
            }
        });

        map.addControl(new mapboxgl.FullscreenControl());

        document.getElementById('locate').addEventListener('click', function(e){
            var lastSeenLocation = JSON.parse(this.getAttribute('data-coordinate'))
        map.flyTo({
            center: lastSeenLocation
        });
        });


    });
</script>

</body>
</html>