How to use xlsx.extendscript.js

Hi @Victor29751988fsbx , Another approach is to temporarily place the excel file and get its contents as a nested array:

var xlsf = File.openDialog("Please Choose an Excel file");

alert("Contents of row 2 cell 1: " + getExcelArray(xlsf)[1][0]);


/**
* Coverts an Excel file into a nested array 
* @ param Excel File to place 
* @ returns the Excel table as a nested array 
* 
*/
function getExcelArray(xf){
    var doc = app.activeDocument;	
    var xta = [];
    var temp = doc.pages[0].textFrames.add();
    try {
        temp.place(xf);
        var xtr = temp.parentStory.tables[0].rows.everyItem().getElements();
    }catch(e) {
        temp.remove()
        alert(e)
    }  
    var c; 
    for (var i = 1; i < xtr.length; i++){
        c = xtr[i].cells.everyItem().getElements();
        var ca = [];
        for (var j = 0; j < c.length; j++){
            ca.push(c[j].texts[0].contents)
        };   
        xta.push(ca)
    };   
    temp.remove()
    return xta;
}