Mongoose returning invalid JSON

gistfile1.js

  ...
  clientID = '1234';
  ...
  models.Client.find({clientID: clientID}, function(err, client) {
    console.log('ClientPasswordStrategy client = ' + client);
    console.log('client.clientID = ' + client.clientID);
  }

Output:

ClientPasswordStrategy client = { name: 'CollabClient',
secret: 'CollabClientSecret',
clientID: 'CollabClientID',
redirectURI: 'http://localhost:3000/auth/callback',
_id: 50abe51812f5a9e37a000001,
__v: 0 }
client.clientID = undefined

Output:

ClientPasswordStrategy client = { name: 'CollabClient',
secret: 'CollabClientSecret',
clientID: 'CollabClientID',
redirectURI: 'http://localhost:3000/auth/callback',
_id: 50abe51812f5a9e37a000001,
__v: 0 }
client.clientID = undefined