Better Backbone.Model/Collection.toJSON

toJSON.js

  Backbone.Model.prototype.toJSON = function () {
    var result = {};
    _.each(this.attributes, function (val, key) {
      if (typeof val === 'undefined') {
        result[key] = val;
      } else if (typeof val.toJSON === 'function') {
        result[key] = val.toJSON();
      } else if (!_.isObject(val)) {
        result[key] = val;
      } else {
        result[key] = _.isArray(val) ? val.slice() : _.extend({}, val);
      }
    });
    return result;
  };