Routing with MapLibreGL map

<html>
<head>
  <meta charset="UTF-8" />
  <link rel="stylesheet" href="https://static.maptoolkit.net/css/maplibre-gl.css" />
  <style>
    body { width: 100%; height: 100%; padding: 0; margin: 0; font-family: Arial, sans-serif; }
    #map { width: 100%; height: 100%; }
  </style>
</head>
<body>
  <div id="map"></div>
  <script src="https://unpkg.com/[email protected]/dist/maplibre-gl.js"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/mapbox-polyline/1.1.1/polyline.min.js"></script>
  <script>
    // Initialize MapLibreGL map
    let map = new maplibregl.Map({
      container: "map",
      style: "https://static.maptoolkit.net/rapidapi/styles/terrain.json?rapidapi-key=your-api-key",
      center: [11.413507, 47.270537],
      zoom: 13,
    });
    map.on("load", () => {
      // Get route from Routing API
      let start = [11.393712, 47.259938],
        end = [11.430896, 47.28187];
      let url = new URL("https://maptoolkit.p.rapidapi.com/route");
      url.searchParams.append("point", `${start[1]},${start[0]}`);
      url.searchParams.append("point", `${end[1]},${end[0]}`);
      url.searchParams.append("routeType", "car");
      url.searchParams.append("rapidapi-key", "your-api-key");
      fetch(url)
        .then((r) => r.json())
        .then((route) => {
          let path = route.paths[0];
          // Add route polyline to map
          let coordinates = polyline.decode(path.points).map(c => c.reverse());
          console.log(coordinates);
          map.addLayer({
            id: "route",
            type: "line",
            source: {
              type: "geojson",
              data: {
                type: "Feature",
                geometry: {
                  type: "LineString",
                  coordinates: coordinates,
                },
              },
            },
            layout: {
              "line-join": "round",
              "line-cap": "round",
            },
            paint: {
              "line-color": "#2a3561",
              "line-width": 5,
            },
          });
          // Add instruction markers with popup to map
          path.instructions.forEach((instruction) => {
            let $img = document.createElement("img");
            $img.src = "https://static.maptoolkit.net/sprites/maptoolkit/route-via.svg";
            $img.width = 12;
            $img.height = 12;
            $img.style["cursor"] = "pointer";
            new maplibregl.Marker({
              element: $img,
              anchor: "center",
            })
              .setLngLat(instruction.coordinate.reverse())
              .addTo(map)
              .setPopup(new maplibregl.Popup().setHTML(`<p>${instruction.text}</p>`));
          });
          // Add route end marker
          let $img = document.createElement("img");
          $img.src = "https://static.maptoolkit.net/sprites/maptoolkit/marker.svg";
          $img.width = 29;
          $img.height = 30;
          let marker = new maplibregl.Marker({
            element: $img,
            anchor: "bottom",
          })
            .setLngLat(coordinates[coordinates.length - 1])
            .addTo(map);
        });
    });
  </script>
</body>
</html>