This includes initial connection, like await nnect(), as well as any operations that make requests to MongoDB, like save() or find().īy default, serverSelectionTimeoutMS is 30000 (30 seconds). The serverSelectionTimeoutMS option is extremely important: it controls how long the MongoDB Node.js driver will attempt to retry any operation before erroring out. We recommend you do not set this setting below 1000, too many heartbeats can lead to performance degradation.

Mongoose only emits a 'disconnected' event after a heartbeat has failed, so you may want to decrease this setting to reduce the time between when your server goes down and when Mongoose emits 'disconnected'. A heartbeat is subject to serverSelectionTimeoutMS, so the MongoDB driver will retry failed heartbeats for up to 30 seconds by default. heartbeatFrequencyMS - The MongoDB driver sends a heartbeat every heartbeatFrequencyMS to check on the status of the connection.If not set, the MongoDB driver defaults to using 30000 (30 seconds). serverSelectionTimeoutMS - The MongoDB driver will try to find a server to send any given operation to, and keep retrying for serverSelectionTimeoutMS milliseconds.If you are getting an unexpected login failure, you may need to set this option. In MongoDB, users are scoped to a database. authSource - The database to use when authenticating with user and pass.Mongoose to establish a connection to MongoDB. Mongoose lets you start using your models immediately, without waiting for connect( the mongodb connection string spec for more details. You can also specify several more parameters in the uri: mongoose. That is because Node.js 18 and up prefer IPv6 addresses, which means, on many machines, Node.js will resolve localhost to the IPv6 address ::1 and Mongoose will be unable to connect, unless the mongodb instance is running with ipv6 enabled. This is the minimum needed to connect the myapp database running locally on the default port (27017).įor local MongoDB databases, we recommend using 127.0.0.1 instead of localhost. You can connect to MongoDB with the nnect() method.

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