Convert XLS to CSV on the server in Node [closed]

Answer 1

I am using this package to convert XLSX to CSV: https://www.npmjs.com/package/xlsx

XLSX = require('xlsx');

const workBook = XLSX.readFile(inputFilename);
XLSX.writeFile(workBook, outputFilename, { bookType: "csv" });

Answer 2

There is no library that I am aware of, but you could use node-xlsx to parse the excel file, get the rows and make the CSV yourself. Here's an example:

var xlsx = require('node-xlsx');
var fs = require('fs');
var obj = xlsx.parse(__dirname + '/test.xls'); // parses a file
var rows = [];
var writeStr = "";

//looping through all sheets
for(var i = 0; i < obj.length; i++)
{
    var sheet = obj[i];
    //loop through all rows in the sheet
    for(var j = 0; j < sheet['data'].length; j++)
    {
            //add the row to the rows array
            rows.push(sheet['data'][j]);
    }
}

//creates the csv string to write it to a file
for(var i = 0; i < rows.length; i++)
{
    writeStr += rows[i].join(",") + "\n";
}

//writes to a file, but you will presumably send the csv as a      
//response instead
fs.writeFile(__dirname + "/test.csv", writeStr, function(err) {
    if(err) {
        return console.log(err);
    }
    console.log("test.csv was saved in the current directory!");
});