JSFiddle - React, Tailwind, and code Playground

HTML

<pre></pre>

JavaScript

function ascii_table(array, header) {
  if (!array.length) {
    return '';
  }
  var lengths = array[0].map(function(_, i) {
    var col = array.map(function(row) {
      if (row[i] != undefined) {
        return row[i].length;
      } else {
        return 0;
      }
    });
    return Math.max.apply(Math, col);
  });

  // JUST ADDED THIS CODE
  array = array.reduce(function (carry, originalRow) {
    var commentLines = originalRow[4].split(/\n/g);

    var rows = commentLines.map(function (commentLine, rowIndex) {
        var newRow = originalRow.map(function (originalCellContent, columnIndex) {
            var cellContent = '';

            if (rowIndex === 0) {
                cellContent = originalCellContent;
            }
            if (columnIndex === 4) {
                cellContent = commentLine;
            }

            return cellContent;
        });
        carry.push(newRow);
    });

    return carry;
  }, []);


array = array.map(function(row) {
    return '| ' + row.map(function(item, i) {
      var size = item.length;
      if (size < lengths[i]) {
        item += new Array(lengths[i]-size+1).join(' ');
      }
      return item;
    }).join(' | ') + ' |';
  });
  var sep = '+' + lengths.map(function(length) {
    return new Array(length+3).join('-');
  }).join('+') + '+';
  if (header) {
    return sep + '\n' + array[0] + '\n' + sep + '\n' +
      array.slice(1).join('\n') + '\n' + sep;
  } else {
    return sep + '\n' + array.join('\n') + '\n' + sep;
  }
}
var input = [{"date":"2016-01-28 11:40:59","nick":"lol","email":"[email protected]","www":"","comment":"nocomment\nlol\nlol\nlol","ip":"1844311719","avatar":"avatars\/default.png"},{"date":"2016-01-10 15:13:59","nick":"ehs","email":"what","www":"","comment":"ente rm comment.","ip":"1423172924","avatar":"avatars\/default.png"}];
var table = [Object.keys(input[0])].concat(input.map(function(row) {
	return Object.keys(row).map(function(key) {
  	return row[key];
  });
}));
var pre =...