beautify.js

var test2 = {
	"font.size" : 3,
	"font.family" : "Arial",
	"text" : "Attr",
	"some-nice-attr.some-nice-child.some-nice-grand-child" : 3,
	"some-nice-attr.some-nice-niece" : 4
};

var _ = require('lodash')

function beautify(k) {
	var arr = k.split('-').map(function(x) {
		return x.charAt(0).toUpperCase() + x.slice(1);
	});
	return arr.join('');
}

function conv(obj) {
	var out = {};
	for (var k in obj) {
		var v = obj[k];
		var index = k.indexOf('.');
		if (index >= 0) {
			var lhs = k.substr(0,index);
			var rhs = k.substr(index+1);
			var tmp = {};
			tmp[rhs] = v;
			k = lhs;
			v = tmp;
		}
		k = beautify(k);
		if (_.isObject(v)) {
			out[k] = out[k] || {};
			_.extend(out[k],conv(v));	
		} else {
			out[k] = v;
		}
	}
	return out;
}

console.log(JSON.stringify(conv(test2)))