I'm trying to load a local GeoJSON to a Leaflet map. I'm new to Leaflet so I was just following this example: https://www.igismap.com/add-load-geojson-file-point-polyline-polygon-map-leaflet-js/

So in the page html, I added this:

<div id="map" style="width: 600px; height: 400px; position: center;"></div>
<script src="maps/overview.js"></script>

And in the overview.js file, I added this:

// loading GeoJSON file - Here my html and usa_adm.geojson file resides in same folder
// L.geoJson function is used to parse geojson file and load on to map
L.geoJSON(data,{style: myStyle}).addTo(map);

When I used the Brackets to see the live preview of the page, the features in the GeoJSON file were shown. But when I accessed it from the web, the polygon was not shown. What could be the issue here?

Update: Error found in browser console: enter image description here

  • probably a CORS issue
    – ziggy
    Jan 26, 2021 at 17:23
  • Look for the errors in the browser debugger console. Any errors there? Any errors in the debugger network section?
    – TomazicM
    Jan 26, 2021 at 17:42
  • @TomazicM Yes. "Failed to load resource: the server responded with a status of 404 (Not Found)"
    – J.Tran
    Jan 26, 2021 at 22:48

1 Answer 1


Thanks all for the suggestions. I found the 404 error is due to the .geojson extension is not configured in IIS. I fixed the issue by adding '.geojson' in MIME types of IIS manager (https://bobcares.com/blog/how-to-add-mime-type-in-iis/). I hope it will not cause any unexpected issues.

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