I have downloaded OpenLayers v6.3.1 libraries and successfully displayed a simple map on my local server, and now I'm trying to load a GeoJSON file as a new vector layer into this map.

But for some reason it's not loading.

Here is what it shows in Chrome : enter image description here

And here is the code.

<!doctype html>
<html lang="en">
    <link rel="stylesheet" href="css_cyclo_temp.css">
    <link rel="stylesheet" href="libraries/ol.css">

    <script type="text/javascript" src="libraries/ol.js"></script>

    <div id="map" class="map"></div>
    <script type="text/javascript">

            var map = new ol.Map({
        target: 'map',
        layers: [
          new ol.layer.Tile({
            source: new ol.source.OSM()
          new ol.layer.VectorImage ({
            visible: true,
            source: new ol.source.Vector ({
              //projection : 'EPSG:3857',
              url: "kml/test.geojson",
              format: new ol.format.GeoJSON()

        view: new ol.View({
          center: ol.proj.fromLonLat([4.8374852,45.7568633]),
          zoom: 12

  • This is the error : Access to XMLHttpRequest at 'file:///C:/wamp64/www/cyclo_temp/v2/kml/test.geojson' from origin 'null' has been blocked by CORS policy: Cross origin requests are only supported for protocol schemes: http, data, chrome, chrome-extension, https. kml/test.geojson:1 Failed to load resource: net::ERR_FAILED
    – Hub Lot
    Apr 11, 2020 at 13:42
  • 3
    Most browsers do not allow xhr requests to the C: drive. To test locally you must either run from localhost or use a browser such as Edge which does allow file protocol xhr.
    – Mike
    Apr 11, 2020 at 13:55
  • You have to use a web server like IIS, Apache, nginx...
    – himyata
    Apr 14, 2020 at 11:03

1 Answer 1


Your code is correct, I see you also have WAMP installed, you are just trying to access your webpage the wrong way.

Try http://localhost/cyclo_temp/v2/TestMap.html instead of file:///C:/wamp64/www/cyclo_temp/v2/TestMap.html

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