I would like to know if it is possible to create an Excel File and make it downloaded from a web page with javascript ?

Currentlly, I succes to create a .csv and make it downloaded with the following code :

var blob = new Blob([csvText], { type: 'text/csv;charset=UFT-8;' });

var link = document.createElement(a);

if (link.download !== undefined) { // feature detection

    // Browsers that support HTML5 download attribute

    var url = URL.createObjectURL(blob);

    link.setAttribute(href, url);

    link.setAttribute(download, file.csv);

    link.style.visibility = 'hidden';

    document.body.appendChild(link);

    link.click();

    document.body.removeChild(link);

}

I am wondering if there is any librairies in javascript with permit to convert the file from csv format to xlsx format and make it downloaded the same way than the csv ?

The final aim is to set a template in the downlaoded xlsx.