Mongoose: Can't connect to MongoDB atlas database

[khaledosman]

Mongoose v5.2.1

Do you want to request a feature or report a bug?
Bug

What is the current behavior?
Mongo connection error when trying to connect to MongoDB Atlas database..

{ MongoError: seed list contains no mongos proxies, replicaset connections requires the parameter replicaSet to be supplied in the URI or options object, mongodb://server:port/db?replicaSet=name
    at connectCallback (/node_modules/mongodb/lib/operations/mongo_client_ops.js:236:23)
    at process.nextTick (/node_modules/mongodb/lib/operations/mongo_client_ops.js:436:7)
    at process._tickCallback (internal/process/next_tick.js:61:11)
  name: 'MongoError',
  message:
   'seed list contains no mongos proxies, replicaset connections requires the parameter replicaSet to be supplied in the URI or options object, mongodb://server:port/db?replicaSet=name',
  [Symbol(mongoErrorContextSymbol)]: {} }

If the current behavior is a bug, please provide the steps to reproduce.

1. create a free tier database from MongoDB Atlas and try to use the connection string

mongoose.connect(process.env.MONGO_URL, {
  reconnectTries: 100,
  reconnectInterval: 500,
  autoReconnect: true,
  useNewUrlParser: true,
  dbName: 'test'
})
  .catch(err => console.log('Mongo connection error', err))

Where MONGO_URL looks like mongodb+srv://<username>:<password>@<url>?retryWrites=true

What is the expected behavior?
Should connect successfully
Please mention your node.js, mongoose and MongoDB version.
node v10.5.0
mongoose v5.2.1
mongodb v3.6.5

[lineus]

@khaledosman are you passing the option { useNewUrlParser: true } into your mongoose connection? There is a bug that will be fixed with the next release of the native driver that causes the new url parser to not work with the srv uri string. see #6656 for more info.

For the moment In order to use the srv uri you'll need to use the old uri parser and live with the deprecation warning node --no-deprecation, or alternatively you can connect to mongodb with just the hosts and ports in the non-srv uri string, and everything else in the options object. i posted a comment here using my atlas connection details as an example.

[khaledosman]

commenting the "useNewUrlParser" option and removing retryWrites from the url fixed the problem. Thanks for the quick reply!