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How do I load GeoJSON file, which is in my laptop, into my HTML code to include some features into my OpenLayers map?

2

Load it into a vector source with an URL relative to the location of your Javascript/HTML file:

var vectorSource = new ol.source.Vector({
    url: "layers/features.geojson",
    format: new ol.format.GeoJSON()
});

See this example for more details.

2

You can refre this answer Solved Answer.

You can include openlayers-3 in your html code and include the following code

var gjson_source=new ol.source.Vector({
                    url: "geojson.txt,      
                    format: new ol.format.GeoJSON()
                    })
var gjson = new ol.layer.Vector({
                    source: gjson_source
                    });     
                    map.addLayer(gjson);

url will be your Geojson file but extension as txt.

Pleaser refer Geojson Example

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