Generate a token

You can generate a token using a username and password. In this example, both are hardcoded in.

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<html>
  <head>
    <meta charset="utf-8" />
    <title>Generate a token</title>
    <meta name="viewport" content="initial-scale=1, maximum-scale=1, user-scalable=no" />
    <link rel="stylesheet" href="https://unpkg.com/leaflet@1.9.4/dist/leaflet.css" crossorigin="" />
    <script src="https://unpkg.com/leaflet@1.9.4/dist/leaflet.js" crossorigin=""></script>
    <!-- Load Esri Leaflet from CDN -->
    <script src="https://unpkg.com/esri-leaflet@3.0.12/dist/esri-leaflet.js"></script>
    <!-- Load Esri Leaflet Vector from CDN -->
    <script src="https://unpkg.com/esri-leaflet-vector@4.2.5/dist/esri-leaflet-vector.js" crossorigin=""></script>
    <style>
      html,
      body,
      #map {
        padding: 0;
        margin: 0;
        height: 100%;
        width: 100%;
        font-family: Arial, Helvetica, sans-serif;
        font-size: 14px;
        color: #323232;
      }
    </style>
  </head>
  <body>
    <div id="map"></div>
    <script>
      const accessToken = "YOUR_ACCESS_TOKEN";
      if (!window.location.origin) {
        window.location.origin =
          window.location.protocol + "//" + window.location.hostname + (window.location.port ? ":" + window.location.port : "");
      }

      const map = L.map("map").setView([34.089, -116.865], 9);

      L.esri.Vector.vectorBasemapLayer("arcgis/nova", {
        token: accessToken
      }).addTo(map);

      function serverAuth(callback) { //To acess the dynamic map layer
        L.esri.post(
          "https://sampleserver6.arcgisonline.com/arcgis/tokens/generateToken", //https://[root]/generateToken (POST only)
          {
            username: "user1",
            password: "user1",
            f: "json",
            expiration: 86400,
            client: "referer",
            referer: window.location.origin
          },
          callback
        );
      }

      serverAuth(function (error, response) {
        if (error) {
          return;
        }
        const dl = L.esri
          .dynamicMapLayer({
            url: "https://sampleserver6.arcgisonline.com/arcgis/rest/services/Wildfire_secure_ac/MapServer",
            opacity: 1,
            token: response.token
          })
          .addTo(map);
        dl.on("authenticationrequired", function (e) {
          serverAuth(function (error, response) {
            if (error) {
              return;
            }
            e.authenticate(response.token);
          });
        });
      });
    </script>
  </body>
</html>