npm install connect-facebook

git clone https://github.com/gasi/connect-facebook.git connect-facebook
npm link ./connect-facebook

var connect = require('connect');
var facebookMiddleware = require('connect-facebook');

// Define your Facebook credentials:
var FACEBOOK_APP_ID = '';
var FACEBOOK_APP_SECRET = '';

connect.createServer(
    connect.cookieParser(),
    facebookMiddleware(FACEBOOK_APP_ID, FACEBOOK_APP_SECRET),
    function(req, res, next) {
        res.end(JSON.stringify(req.facebook.session));
    }
);

/*
    Output:

    {
        access_token: '...',
        expires: '13034...',
        secret: '...',
        session_key: '...',
        sig: '...',
        uid: '630665057'
    }
*/