ObjectやArrayを見やすく整形

pp.js

var pp = function(object, offset)
{
  var indent = '  ';
  offset = offset || '';
  var output = '';
  if (object.constructor === Array) {
    output += '[\n';
    for (var i = 0, len = object.length; i < len; i += 1) {
      output += offset + indent;
      output += pp(object[i], offset + indent);
      output += ',\n';
    }
    output += offset + ']';
  } else if (object.constructor === Object) {
    output += '{\n';
    for (var i in object) {
      output += offset + indent;
      output += pp(i) + ': ' + pp(object[i], offset + indent);
      output += ',\n';
    }
    output += offset + '}';
  } else {
    output += '"' + object + '"';
  }
  return output;
};