Nodejs Request values - json

Question

So I have a nodejs server and I am trying to make comparisons to the req values. Firstly, here is my code:
app.post('/', function(req, res) {
firstName = req.body.firstName;
lastName = req.body.lastName;
message = req.body.message;
token = req.body.token;
user = {name: firstName + " " + lastName, token: token};
selectedUser = req.body.selectedUser;
users.push(user);
console.log(user.name);
if (req.body.isAndroid === true) {
sendToAndroid(); //add message parameter
} else {
sendToios(); //add message parameter
}
});
app.listen(8080, function() {
console.log('running on port 8080');
});
//GCM
function sendToAndroid() {
var message = new gcm.Message();
var tokenLocation;
//API Server Key
var sender = new gcm.Sender('AIzaSyD-B3EG1xpMh6YhwBKfLMyw0GIQKWfGgZM');
//console.log(message);
// Value the payload data to send...
message.addData({
title: 'Hello',
body: 'Message From: ' + user.name + ': ' + message,
msgcnt: 1,
timeToLive: 3000
});
// At least one reg id required
if (registrationToken.indexOf(token) == -1) {
registrationToken.push(token);
tokenLocation = registrationToken.indexOf(token);
} else {
tokenLocation = registrationToken.indexOf(token);
}
if (users.indexOf(user.name) == -1) {
console.log("user destination not found");
} else {
var userTokenArray = [];
userTokenArray.push(user.token);
sender.send(message, { registrationTokens: userTokenArray } , function (err, response) {
if(err) console.error(err);
else console.log(response);
});
userTokenArray.pop();
}
}
And here is my problem when outputting to see what the value is:
running on port 8080
undefined undefined
user destination not found
What I am trying to do is put the registered users into an array of users that each element has a full name and token. Then in the Android function, it will check to see what value value is selected and then push a notification to the selectedUser via their token. I am so confused on how to compare the "strings" or whatever they are. I am using nodejs express with body-parser.