How to set cell width when export .xlsx files with js-xlsx

Question

I am trying to set a fixed column/cell width to my exported excel files with js-xlsx.

EDIT:

Here is the source of js-xlsx: https://github.com/SheetJS/js-xlsx

Answer 1

Extending the question, if you need to set automatic width base on your content, you can write as following:

const worksheet = XLSX.utils.aoa_to_sheet(arrayOfArray);
worksheet['!cols'] = fitToColumn(arrayOfArray);

function fitToColumn(arrayOfArray) {
    // get maximum character of each column
    return arrayOfArray[0].map((a, i) => ({ wch: Math.max(...arrayOfArray.map(a2 => a2[i].toString().length)) }));
}

This function assumes your first row has most columns. It then tries to find the widest cell in each column by calculating content character length.