Specify Connection Options

Overview

This guide explains several common MongoDB connection and authentication options. You can pass the connection options as parameters in the connection URI to specify the behavior of the client.

Options

The following table describes the connection options that you can set in your connection URI. Each entry provides the option name, value type, default value, and a description of the option.

Option Name	Type	Default Value	Description
timeoutMS	integer	`null`	Specifies the number of milliseconds that a single operation run on the `Client` can take before returning a timeout error. Operations honor this setting only if there is no deadline on the operation Context. To learn more about this option, see the CSOT guide.
connectTimeoutMS	integer	`30000`	Specifies the time in milliseconds to attempt a connection before timing out.
maxPoolSize	integer	`100`	Specifies the maximum number of connections that a connection pool may have at a given time.
replicaSet	string	`null`	Specifies the replica set name for the cluster. All nodes in the replica set must have the same replica set name, or the Client will not consider them as part of the set.
maxIdleTimeMS	integer	`0`	Specifies the maximum amount of time a connection can remain idle in the connection pool before being removed and closed. The default is `0`, meaning a connection can remain unused indefinitely.
minPoolSize	integer	`0`	Specifies the minimum number of connections that the driver maintains in a single connection pool.
serverSelectionTimeoutMS	integer	`30000`	Specifies the number of milliseconds to wait to find an available, suitable server to execute an operation.
heartbeatFrequencyMS	integer	`10000`	Specifies the number of milliseconds to wait between periodic background server checks.
tls	boolean	`false`	Specifies whether to establish a Transport Layer Security (TLS) connection with the instance. This is automatically set to `true` when using a DNS seedlist (SRV) in the connection string. You can override this behavior by setting the value to `false`.
w	string or integer	`null`	Specifies the write concern. To learn more about values, see the server documentation on Write Concern options.
directConnection	boolean	`false`	Specifies whether to force dispatch all operations to the host specified in the connection URI.

For a full list of connection options, see the ClientOptions API documentation.

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