Show Polygon Data from GeoJSON on the Map

This tutorial shows how to add a GeoJSON overlay to the map using Leaflet JS.

Copy the following code, paste it into your favorite text editor, and save it as a .html file.

Install the npm package.
Include the CSS file.

If you have a bundler that can handle CSS, you can import the CSS or include it with a <link> in the head of the document via the CDN
Include the following code in your JavaScript file (Example: main.js).

Replace YOUR_MAPTILER_API_KEY_HERE with your own API key. Make sure to secure the key before you publish it.
The next is up to you. You can center your map wherever you desire (modifying the starting position) and set an appropriate zoom level (modifying the starting zoom) to match your users’ needs. Additionally, you can change the map’s look (by updating the source URL); choose from a range of visually appealing map styles from our extensive MapTiler standard maps, or create your own to truly differentiate your application.

Create GeoJSON layer. The following snippet creates GeoJSON layer with one feature (without attributes) and polygon geometry.


 L.geoJSON({
     'type': 'Feature',
     'geometry': {
     'type': 'Polygon',
     'coordinates': [
         [
         [-67.13734351262877, 45.137451890638886],
         [-66.96466, 44.8097],
         [-68.03252, 44.3252],
         [-69.06, 43.98],
         [-70.11617, 43.68405],
         [-70.64573401557249, 43.090083319667144],
         [-70.75102474636725, 43.08003225358635],
         [-70.79761105007827, 43.21973948828747],
         [-70.98176001655037, 43.36789581966826],
         [-70.94416541205806, 43.46633942318431],
         [-71.08482, 45.3052400000002],
         [-70.6600225491012, 45.46022288673396],
         [-70.30495378282376, 45.914794623389355],
         [-70.00014034695016, 46.69317088478567],
         [-69.23708614772835, 47.44777598732787],
         [-68.90478084987546, 47.184794623394396],
         [-68.23430497910454, 47.35462921812177],
         [-67.79035274928509, 47.066248887716995],
         [-67.79141211614706, 45.702585354182816],
         [-67.13734351262877, 45.137451890638886]
         ]
     ]
     }
     }, {
     style: {
     color: "#088",
     opacity: 0.8,
     fillColor: "#088",
     fillOpacity: 0.8
     }
 }).addTo(map);

Complete source code

<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Display a map</title>
  <link rel="stylesheet" href="https://unpkg.com/leaflet@1.9.4/dist/leaflet.css" />
  <script src="https://unpkg.com/leaflet@1.9.4/dist/leaflet.js"></script>
  <style>
    body {
      margin: 0;
      padding: 0;
    }

    #map {
      position: absolute;
      top: 0;
      bottom: 0;
      width: 100%;
    }
  </style>
</head>

<body>
  <div id="map"></div>
</body>
<script>
  const key = 'YOUR_MAPTILER_API_KEY_HERE';

  const map = L.map('map').setView([45.137451890638886, -68.13734351262877], 6);
  const layer = L.tileLayer(`https://api.maptiler.com/maps/streets-v4/{z}/{x}/{y}.png?key=${key}`, {
    tileSize: 512,
    zoomOffset: -1,
    minZoom: 1,
    attribution: "\u003ca href=\"https://www.maptiler.com/copyright/\" target=\"_blank\"\u003e\u0026copy; MapTiler\u003c/a\u003e \u003ca href=\"https://www.openstreetmap.org/copyright\" target=\"_blank\"\u003e\u0026copy; OpenStreetMap contributors\u003c/a\u003e",
    crossOrigin: true
  }).addTo(map);
  L.geoJSON({
    'type': 'Feature',
    'geometry': {
      'type': 'Polygon',
      'coordinates': [
        [
          [-67.13734351262877, 45.137451890638886],
          [-66.96466, 44.8097],
          [-68.03252, 44.3252],
          [-69.06, 43.98],
          [-70.11617, 43.68405],
          [-70.64573401557249, 43.090083319667144],
          [-70.75102474636725, 43.08003225358635],
          [-70.79761105007827, 43.21973948828747],
          [-70.98176001655037, 43.36789581966826],
          [-70.94416541205806, 43.46633942318431],
          [-71.08482, 45.3052400000002],
          [-70.6600225491012, 45.46022288673396],
          [-70.30495378282376, 45.914794623389355],
          [-70.00014034695016, 46.69317088478567],
          [-69.23708614772835, 47.44777598732787],
          [-68.90478084987546, 47.184794623394396],
          [-68.23430497910454, 47.35462921812177],
          [-67.79035274928509, 47.066248887716995],
          [-67.79141211614706, 45.702585354182816],
          [-67.13734351262877, 45.137451890638886]
        ]
      ]
    }
  }, {
    style: {
      color: "#088",
      opacity: 0.8,
      fillColor: "#088",
      fillOpacity: 0.8
    }
  }).addTo(map);
</script>

</html>

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Complete source code

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