converter.js

function RawToBook(raw) {
   var columns = raw.split(',');
   return {
     IBSN: columns[0],
     Title: columns[1],
     Author: columns[2],
     Press: columns[3],
     Class: columns[4],
     Description: columns[5],
   };
}

function ParseStringToBooks(raw) {
 if(raw.length == 0) {
  return; 
 }
   
 var rows = raw.split(';');
 return rows.map(RowToBook);
}

var books = ParseStringToBooks(input);
// books[0].IBSN => 123456
// books[1].Title => "XXXXX"