Simplify complex features | Esri Leaflet

You can simplify complex features for faster response times. Zoom in to watch as higher resolution vectors are loaded from the serviceA service, also known as an ArcGIS service, is software that supports an ArcGIS REST API and provides geospatial functionality or data. A service can be hosted by Esri or in ArcGIS Enterprise.Learn more. Hover over features to display the zipcode and city name. To learn more about L.esri.featureLayer, visit the API reference.

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<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8">
    <title>Simplify complex features</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@3.0.19/dist/esri-leaflet.js"></script>

    <!-- Load Esri Leaflet Vector from CDN -->
    <script src="https://unpkg.com/esri-leaflet-vector@4.3.2/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>
    <style>
      #info-pane {
        position: absolute;
        top: 10px;
        right: 10px;
        z-index: 400;
        padding: 1em;
        background: white;
      }
    </style>
    <div id="map"></div>
    <div id="info-pane" class="leaflet-bar">Hover to Inspect</div>
    <script>
      const accessToken = "YOUR_ACCESS_TOKEN";

      const map = L.map("map").setView([37.75, -122.23], 9);

      L.esri.Vector.vectorBasemapLayer("arcgis/light-gray/base", {
        token: accessToken
      }).addTo(map);

      const zipcodes = L.esri
        .featureLayer({
          url: "https://services.arcgis.com/P3ePLMYs2RVChkJx/arcgis/rest/services/USA_ZIP_Codes/FeatureServer/0",
          simplifyFactor: 0.35,
          precision: 5,
          fields: ["FID", "ZIP", "PO_NAME"],
          style: {
            color: "#A9A9A9",
            weight: 1
          }
        })
        .addTo(map);

      let oldId;

      zipcodes.on("mouseout", function () {
        document.getElementById("info-pane").innerHTML = "Hover to Inspect";
        zipcodes.resetFeatureStyle(oldId);
      });

      zipcodes.on("mouseover", function (e) {
        oldId = e.layer.feature.id;
        document.getElementById("info-pane").innerHTML = e.layer.feature.properties.ZIP + " " + e.layer.feature.properties.PO_NAME;
        zipcodes.setFeatureStyle(e.layer.feature.id, {
          color: "#9D78D2",
          weight: 3,
          opacity: 1
        });
      });
    </script>
  </body>
</html>