Node.js: Parse JSON object

I am receiving a JSON object as :

http.get(options, function(res) {
    res.on('data', function (chunk) {
        console.log('BODY: ' + chunk);
        var obj = JSON.parse(chunk);
        console.log(sys.inspect(obj));
    });
});

And it prints:

BODY: [{"buck":{"email":"chris@example.com"}}]

but now I'm not able to read anything inside it. How do I get the "email" field?

Thanks