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HTML 

              
                <!DOCTYPE html>
<html lang="en" >
   <head>
      <meta charset="UTF-8">
      <title>Drawing isochrones</title>
   </head>
   <body>
      <!DOCTYPE html>
      <html>
         <meta name="description" content="Class 10 Show+Tell: GeoJson">
         <meta charset="utf-8">
         <meta name="viewport" content="width=device-width">
         <head>
          <link rel="stylesheet" href="https://unpkg.com/leaflet@1.8.0/dist/leaflet.css"
          integrity="sha512-hoalWLoI8r4UszCkZ5kL8vayOGVae1oxXe/2A4AO6J9+580uKHDO3JdHb7NzwwzK5xr/Fs0W40kiNHxM9vyTtQ=="
          crossorigin=""/>
                     <script src="https://unpkg.com/leaflet@1.8.0/dist/leaflet.js"
               integrity="sha512-BB3hKbKWOc9Ez/TAwyWxNXeoV9c1v6FIeYiBieIWkpLjauysF18NzgR1MBNBXf8/KABdlkX68nAhlwcDFLGPCQ=="
               crossorigin=""></script>
            <style>
               html, body, #mapid { 
               height: 100%;
               width: 100%;
               padding: 0;
               margin: 0;
               }
               #error {
                  position: absolute;
                  width: 80%;
                  margin: 0px;
                  z-index: 2000;
                  width: 80%;
                  border-radius: 20px;
                  max-width: 500px;
                  top: 30%;  /* position the top  edge of the element at the middle of the parent */
                  left: 50%; /* position the left edge of the element at the middle of the parent */
                  transform: translate(-50%, -50%);
                  background-color: white;
                  padding: 10px;
                  display: none;
                  text-align: center;
              }
            </style>
            <script src="https://unpkg.com/leaflet@1.4.0/dist/leaflet.js"
               integrity="sha512-QVftwZFqvtRNi0ZyCtsznlKSWOStnDORoefr1enyq5mVL4tmKB3S/EnC3rRJcxCPavG10IcrVGSmPh6Qw5lwrg=="
               crossorigin=""></script>
         </head>
         <body>
            <div id="mapid"></div>
         </body>
      </html>
      <div id="error" class="tippy-tooltip honeybee-theme">
         <p><b>No API and APPLICATION_ID key inserted </b></p>
         <p><a href="http://docs.traveltimeplatform.com/overview/getting-keys/">Sign up for an API key</a> 
         <p>Place it in API and APPLICATION_ID variables</p>
      </div>
      <script>
         // The name of the starting location. We will have to geocode this to coordinates.
         var startingLocation = "The White House, DC";
         // The departure time in an ISO format.
         var departureTime =  new Date().toJSON();
         // Travel time in seconds. We want 1 hour travel time so it is 60 minutes x 60 seconds.
         var travelTime = 60 * 20;
         // These secret variables are needed to authenticate the request. Get them from http://docs.traveltimeplatform.com/overview/getting-keys/ and replace 
         var APPLICATION_ID = "place your app id here";
         var API_KEY = "place your api key here";
         
         var mymap = L.map('mapid').setView([38.8, -77.0365], 9);
         
         sendGeocodingRequest(startingLocation); 
         
         	L.tileLayer(`https://tiles.traveltime.com/lux/{z}/{x}/{y}.png?key=${APPLICATION_ID}`, {
         		maxZoom: 18,
         		attribution: 'Map data &copy; <a href="https://www.openstreetmap.org/">OpenStreetMap</a> contributors, ' +
         			'<a href="https://creativecommons.org/licenses/by-sa/2.0/">CC-BY-SA</a>, ' +
         			'Imagery © <a href="https://www.mapbox.com/">Mapbox</a>',
         		id: 'mapbox.streets'
         	}).addTo(mymap);
         
         // Sends the geocoding request.
         function sendGeocodingRequest(location) {
           // The request for the geocoder. Reference: http://docs.traveltimeplatform.com/reference/geocoding-search/
           var request = {
             query: location };
           document.getElementById("error").style.display = "none";
           var xhr = new XMLHttpRequest();
           xhr.responseType = "json";
           xhr.open("GET", "https://api.traveltimeapp.com/v4/geocoding/search?query="+ location)
           xhr.setRequestHeader( "X-Application-Id", APPLICATION_ID);
           xhr.setRequestHeader( "X-Api-Key", API_KEY);
           xhr.setRequestHeader( "Accept-Language", " en-US");
           xhr.onreadystatechange = function () {
              if (xhr.status >= 200 && xhr.status < 300) {
                if(xhr.readyState === 4){
                  sendTimeMapRequest(xhr.response)
                }
              } else {
                if(APPLICATION_ID === "place your app id here" || API_KEY ===  "place your api key here") {
                  document.getElementById("error").style.display = "block";
                }
              }
          };
          xhr.send();
          };
         
 
         // Sends the request of the Time Map multipolygon.
         function sendTimeMapRequest(geocodingResponse) {
         
         
           // The request for Time Map. Reference: http://docs.traveltimeplatform.com/reference/time-map/
           var coords = geocodingResponse.features[0].geometry.coordinates;
           var latLng = { lat: coords[1], lng: coords[0] };
         
           var request = {
             departure_searches: [{
               id: "first_location",
               coords: latLng,
               transportation: {
                 type: "public_transport" },
         
               departure_time: departureTime,
               travel_time: travelTime }],
         
             arrival_searches: [] };
         
          var xhr = new XMLHttpRequest()
          xhr.addEventListener("readystatechange", function () {
            if (this.readyState === 4) {
              drawTimeMap(mymap, this.response);
            }
          });
          xhr.open("POST", "https://api.traveltimeapp.com/v4/time-map")
          xhr.setRequestHeader("X-Application-Id", APPLICATION_ID);
          xhr.setRequestHeader("X-Api-Key", API_KEY);
          xhr.setRequestHeader("Content-Type", "application/json; charset=UTF-8");
          xhr.responseType = "json";
          xhr.send(JSON.stringify(request));
         
         
         // A helper function that converts [{lat: <lat>, lng: <lng>}, ...] to a [[<lat>, <lng>], ...] format.
         function ringCoordsHashToArray(ring) {
           return ring.map(function (latLng) {return [latLng.lat, latLng.lng];});
         };
 
         
         // Draws the resulting multipolygon from the response on the map.
         function drawTimeMap(map, response) {
         
             // Reference for the response: http://docs.traveltimeplatform.com/reference/time-map/#response-body-json-attributes
             var shapesCoords = response.results[0].shapes.map(function (polygon) {
               var shell = ringCoordsHashToArray(polygon.shell);
               var holes = polygon.holes.map(ringCoordsHashToArray);
               return [shell].concat(holes);
             });
             var polygon = L.polygon(shapesCoords, { color: 'red' });
             polygon.addTo(map);
             map.fitBounds(polygon.getBounds());
           
         };
         }
      </script>
   </body>
</html>
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