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It is possible to read the storage Volume of a site collection with JavaScript?

  • For which version of SharePoint do you require this? – Dikesh Gandhi Apr 12 at 10:00
  • Sharepoint 2013 onPrem – cvb Apr 12 at 10:23
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Please try below code after attaching jQuery library on page.

$(function(){
       $.ajax({
        url: _spPageContextInfo.siteAbsoluteUrl + "/_api/site/usage",
        type: "GET",               
        headers: {
            "Accept": "application/json;odata=verbose",
        },
        success: function (data) {
             var percent = data.d.Usage.StoragePercentageUsed;
             percent = 100*percent;
             percent = percent;
             var storage = data.d.Usage.Storage;
             storage = storage/1073741824;
             storage = storage;
             alert("Total storage: "+((storage*100)/percent).toFixed(2)+"GB"); 
             alert("Storage used: "+storage.toFixed(2)+"GB");   
        },
        error: function (data) {
            console.log(data);
        }

    });    

});

P.S.: It will only show proper value if you have set "Quota Template" during site collection creation.

Hope this will help you.

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