CODE EXAMPLE FOR JAVASCRIPT

exceljs read file

var workbook = new Excel.Workbook(); 
workbook.xlsx.readFile(filename)
    .then(function() {
        var worksheet = workbook.getWorksheet(sheet);
        worksheet.eachRow({ includeEmpty: true }, function(row, rowNumber) {
          console.log("Row " + rowNumber + " = " + JSON.stringify(row.values));
        });
});