WTF8 
A UTF-8 decoder and encoder which can handle characters outside Basic Multilingual Plane for node.js. It's also reasonably fast.
Why?
V8 doesn't like 4-byte UTF-8 characters. 😞
Methods
.decode(buffer)
Decode buffer containing UTF-8 data to JS string.
var utf8 = require('wtf8');
utf8.decode(new Buffer([0x68, 0x65, 0x6c, 0x6c, 0x6f]));
// => 'hello'
.encode(string)
Encode strings to buffer.
var utf8 = require('wtf8');
utf8.encode('hello');
// => <SlowBuffer 68 65 6c 6c 6f>
TODO