Show Polygon data from GeoJSON on the Map

This tutorial shows how to add a Polygon GeoJSON overlay to the map using OpenLayers.

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

2. Replace YOUR_MAPTILER_API_KEY_HERE with your actual MapTiler API key.

3. 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.

4. Create GeoJSON source. The following snippet creates GeoJSON source hosted on MapTiler (check out the How to Upload GeoJSON to MapTiler tutorial). Publish the dataset and copy link to the geojson. Download the Rio de Janeiro sample data.

   
        });
      const layer = new ol.layer.Vector({
        source: new ol.source.Vector({
          url: `https://api.maptiler.com/data/YOUR_MAPTILER_DATASET_ID_HERE/features.json?key=${key}`,
          format: new ol.format.GeoJSON(),
        }),
        style: new ol.style.Style({
          stroke: new ol.style.Stroke({
            color: 'rgba(0, 136, 136, 0.8)',
          }),
          fill: new ol.style.Fill({
            color: 'rgba(0, 136, 136, 0.8)',
          }),
        })
      });
      map.addLayer(layer);
    

Related examples

Point GeoJSON Layer

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Show Point data from GeoJSON on the Map: this tutorial shows how to add a Point GeoJSON overlay to the map using OpenLayers.

MultiGeom GeoJSON Layer

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Show MultiGeometry data from GeoJSON on the Map: This tutorial shows how to add a GeoJSON overlay to the map using OpenLayers.

Vector tiles with GeoJSON

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Learn how to display polygon from GeoJSON above vector tiles but bellow labels with OpenLayers using the ol-mapbox-style plugin.

Choropleth GeoJSON

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This tutorial shows how to add a styled GeoJSON overlay to the map using OpenLayers, display a popup on click, and create a map legend.