Reading xlsx, csv files using exceljs in node

readSheet.js

var Excel = require('exceljs');
var workbook = new Excel.Workbook(); 
workbook.xlsx.readFile('../../storage/cust_88ae31d4-47c5-4f70-980e-7b473ba20ef9/xls.xls')
    .then(function() {
        var worksheet = workbook.getWorksheet('Sheet1');
        worksheet.eachRow({ includeEmpty: true }, function(row, rowNumber) {
          console.log("Row " + rowNumber + " = " + JSON.stringify(row.values));
        });
    });

workbook.csv.readFile('../../storage/cust_88ae31d4-47c5-4f70-980e-7b473ba20ef9/gd1.csv')
    .then(function(worksheet) {
        worksheet.eachRow({ includeEmpty: true }, function(row, rowNumber) {
            console.log("Row " + rowNumber + " = " + JSON.stringify(row.values));
        });
    })