csvToJSON.js

function csvToJSON(data) {
  var rows = [['']];
  for (var i = 0, l = data.length, char = data[i], wasInSpeechMarks = false, isInSpeechMarks = false; i < l; char = data[++i]) {
    if (wasInSpeechMarks && char !== "," && char !== "\n" && char !== "\r") { // skip after speech mark waiting for new column or row
    } else if (isInSpeechMarks && char === '"' && data[i+1] !== '"') { // at end of speechmark block
      isInSpeechMarks = false;
      wasInSpeechMarks = true;
    } else if (isInSpeechMarks || char !== '"' && char !== "," && char !== "\n" && char !== "\r") { // is in speechmarks or not a new colum or row
      if (isInSpeechMarks && char === '"' && data[i+1] === '"') i++; // is in speechmarks at a double quote
      rows[rows.length-1][rows[rows.length-1].length-1] += char; // add character to current cell
    } else if (char === '"') { // is at the start of speechmarks
      rows[rows.length-1][rows[rows.length-1].length-1] = ''; // remove everything before opening speechmark
      isInSpeechMarks = true;
    } else { // new colum or row
      wasInSpeechMarks = false;
      if (char === '\r' && data[i+1] === '\n') i++; // as new colum in windows format, skip character
      if (char === ',') rows[rows.length-1].push(''); // add new column
      else rows.push(['']); // add new row
    }
  }
  return rows;
};