Js2Json.js

function processRow(row, fields, fieldSeparator)
{
  const
  outRow  = [],
  keys    = Array.isArray(row)
    ? Object.keys(row)
    : (fields || Object.keys(row));

  for(let j = 0; j < keys.length; j++)
  {
    const val = row[keys[j]];
    let innerValue = val === null || val === undefined
      ? ''
      : val.toString();
    if (val instanceof Date)
    {
      innerValue = val.toLocaleString();
    }
    let result = innerValue.replace(/"/g, '""');
    if (result.search(/("|,|;|\n)/g) >= 0)
    {
      result = '"' + result + '"';
    }
    outRow.push(result);
  }
  return outRow.join(fieldSeparator);
}

module.exports = function (rows, fields, fieldSeparator = ',', rowSeparator = "\r\n")
{
  //Setup fields
  const kfields = fields
    ? Array.isArray(fields)
      ? fields
      : Object.keys(fields)
    : undefined;

  //Init csv output
  return (
    fields
      ? processRow(fields, undefined, fieldSeparator) + rowSeparator
      : ''
    )
    + rows.map((row) => processRow(row, kfields, fieldSeparator)).join(rowSeparator);
};