node.js - Error: failed to connect to [undefined:27017] -

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i error when trying connect db setup on mongolab

error: failed connect [undefined:27017]

however, connection uri is: 

'user' :  'mongodb://dbusernamestring:dbpasswordstring@ds027789.mongolab.com:27789/db1'

so undefined come from?

as can see in the tutorial mentioned, have use url instead of user, change should be:

'url' :  'mongodb://dbusernamestring:dbpasswordstring@ds027789.mongolab.com:27789/db1'

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