Node.js parser of xlsx files

xlsx-node-parser.js

var XLSX = require('xlsx');
var workbook = XLSX.readFile('fileName.xlsx');
var sheet_names = workbook.SheetNames;//array of sheet names
//console.log(sheet_names);
var worksheet = workbook.Sheets;

for(x in sheet_names) {
  worksheet = workbook.Sheets[sheet_names[x]];
  //console.log(worksheet);
  var header = []; //initialize header array
  var data = [];   //initialize data array
  for(y in worksheet) {
    //console.log(y[0]);
    //console.log(y[1]);
    if (y[0] === '!') continue;
    var col = y[0];
    //console.log(col);
    var row = y[1];
    //console.log(row);
    var value = worksheet[y].v;
    //console.log(worksheet[y]);
    //console.log(value);
    if (row == 1) {
      header[col] = value;
      continue;
    }
    if (!data[row]) data[row] = {};
    data[row][header[col]] = value;
  }
data.shift();
data.shift();
console.log(data);
}