json-special-serializer.js

module.exports = Something;

function Something () {}
Something.prototype.toJSON = function () {
	var clone = {};
	var firstChar;
	var that = this;

	Object.keys(this).forEach(function (key) {
		var firstChar = key[0];

		if (firstChar !== '_' && firstChar !== '$') {
			clone[key] = that[key];
		}
	});

	return clone;
};