Google API Node js

//from ./lib/google.js
var googleapis = require('googleapis');
var OAuth2 = googleapis.auth.OAuth2;
var client = new OAuth2('clientId', 'clientSecret', '/oauth2callback');
var plus = googleapis.plus('v1');
exports.client = client;
exports.plus = plus;

//from app.js
var gapi = require('./lib/google');
app.get('/oauth2callback', function (req, res){
    var code = req.query.code;
    gapi.client.getToken(code, function (err, tokens) {
        gapi.client.setCredentials(tokens);
        gapi.plus.people.get({userId: 'me', auth: gapi.client}, function (err, resp){
            //use the resp object to get user data we want...
        });
    });
});