CSVToJSON

Converts a comma-separated values (CSV) string to a 2D array of objects. The first row of the string is used as the title row.

• Use Array.prototype.slice() and Array.prototype.indexOf('\n') and String.prototype.split(delimiter) to separate the first row (title row) into values.
• Use String.prototype.split('\n') to create a string for each row, then Array.prototype.map() and String.prototype.split(delimiter) to separate the values in each row.
• Use Array.prototype.reduce() to create an object for each row's values, with the keys parsed from the title row.
• Omit the second argument, delimiter, to use a default delimiter of ,.

const CSVToJSON = (data, delimiter = ',') => {
  const titles = data.slice(0, data.indexOf('\n')).split(delimiter);
  return data
    .slice(data.indexOf('\n') + 1)
    .split('\n')
    .map(v => {
      const values = v.split(delimiter);
      return titles.reduce(
        (obj, title, index) => ((obj[title] = values[index]), obj),
        {}
      );
    });
};

CSVToJSON('col1,col2\na,b\nc,d');
// [{'col1': 'a', 'col2': 'b'}, {'col1': 'c', 'col2': 'd'}];
CSVToJSON('col1;col2\na;b\nc;d', ';');
// [{'col1': 'a', 'col2': 'b'}, {'col1': 'c', 'col2': 'd'}];