Class: MongoClient

Methods

staticMongoClient.connect(url, options, callback){Promise.<MongoClient>}

lib/mongo_client.js, line 431

Connect to MongoDB using a url as documented at

docs.mongodb.org/manual/reference/connection-string/

Note that for replicasets the replicaSet query parameter is required in the 2.0 driver

Name	Type	Description
url	string	The connection URI string
options	object	optional Optional settings Name Type Default Description poolSize number 5 optional The maximum size of the individual server pool ssl boolean false optional Enable SSL connection. deprecated use tls variants sslValidate boolean false optional Validate mongod server certificate against Certificate Authority sslCA buffer optional SSL Certificate store binary buffer deprecated use tls variants sslCert buffer optional SSL Certificate binary buffer deprecated use tls variants sslKey buffer optional SSL Key file binary buffer deprecated use tls variants sslPass string optional SSL Certificate pass phrase deprecated use tls variants sslCRL buffer optional SSL Certificate revocation list binary buffer deprecated use tls variants checkServerIdentity boolean | function true optional Ensure we check server identify during SSL, set to false to disable checking. Only works for Node 0.12.x or higher. You can pass in a boolean or your own checkServerIdentity override function. deprecated use tls variants tls boolean false optional Enable TLS connections tlsInsecure boolean false optional Relax TLS constraints, disabling validation tlsCAFile string optional A path to file with either a single or bundle of certificate authorities to be considered trusted when making a TLS connection tlsCertificateKeyFile string optional A path to the client certificate file or the client private key file; in the case that they both are needed, the files should be concatenated tlsCertificateKeyFilePassword string optional The password to decrypt the client private key to be used for TLS connections tlsAllowInvalidCertificates boolean optional Specifies whether or not the driver should error when the server’s TLS certificate is invalid tlsAllowInvalidHostnames boolean optional Specifies whether or not the driver should error when there is a mismatch between the server’s hostname and the hostname specified by the TLS certificate autoReconnect boolean true optional Enable autoReconnect for single server instances noDelay boolean true optional TCP Connection no delay keepAlive boolean true optional TCP Connection keep alive enabled keepAliveInitialDelay number 30000 optional The number of milliseconds to wait before initiating keepAlive on the TCP socket connectTimeoutMS number 10000 optional How long to wait for a connection to be established before timing out socketTimeoutMS number 360000 optional How long a send or receive on a socket can take before timing out family number optional Version of IP stack. Can be 4, 6 or null (default). If null, will attempt to connect with IPv6, and will fall back to IPv4 on failure reconnectTries number 30 optional Server attempt to reconnect #times reconnectInterval number 1000 optional Server will wait # milliseconds between retries ha boolean true optional Control if high availability monitoring runs for Replicaset or Mongos proxies haInterval number 10000 optional The High availability period for replicaset inquiry replicaSet string optional The Replicaset set name secondaryAcceptableLatencyMS number 15 optional Cutoff latency point in MS for Replicaset member selection acceptableLatencyMS number 15 optional Cutoff latency point in MS for Mongos proxies selection connectWithNoPrimary boolean false optional Sets if the driver should connect even if no primary is available authSource string optional Define the database to authenticate against w number | string optional The write concern wtimeout number optional The write concern timeout j boolean false optional Specify a journal write concern forceServerObjectId boolean false optional Force server to assign _id values instead of driver serializeFunctions boolean false optional Serialize functions on any object ignoreUndefined Boolean false optional Specify if the BSON serializer should ignore undefined fields raw boolean false optional Return document results as raw BSON buffers bufferMaxEntries number -1 optional Sets a cap on how many operations the driver will buffer up before giving up on getting a working connection, default is -1 which is unlimited readPreference ReadPreference | string optional The preferred read preference (ReadPreference.PRIMARY, ReadPreference.PRIMARY_PREFERRED, ReadPreference.SECONDARY, ReadPreference.SECONDARY_PREFERRED, ReadPreference.NEAREST) pkFactory object optional A primary key factory object for generation of custom _id keys promiseLibrary object optional A Promise library class the application wishes to use such as Bluebird, must be ES6 compatible readConcern object optional Specify a read concern for the collection (only MongoDB 3.2 or higher supported) Name Type Default Description level ReadConcernLevel 'local' optional Specify a read concern level for the collection operations (only MongoDB 3.2 or higher supported) maxStalenessSeconds number optional The max staleness to secondary reads (values under 10 seconds cannot be guaranteed) loggerLevel string optional The logging level (error/warn/info/debug) logger object optional Custom logger object promoteValues boolean true optional Promotes BSON values to native types where possible, set to false to only receive wrapper types promoteBuffers boolean false optional Promotes Binary BSON values to native Node Buffers promoteLongs boolean true optional Promotes long values to number if they fit inside the 53 bits resolution domainsEnabled boolean false optional Enable the wrapping of the callback in the current domain, disabled by default to avoid perf hit validateOptions object false optional Validate MongoClient passed in options for correctness appname string optional The name of the application that created this MongoClient instance. MongoDB 3.4 and newer will print this value in the server log upon establishing each connection. It is also recorded in the slow query log and profile collections auth.user string optional The username for auth auth.password string optional The password for auth authMechanism string optional Mechanism for authentication: MDEFAULT, GSSAPI, PLAIN, MONGODB-X509, or SCRAM-SHA-1 compression object optional Type of compression to use: snappy or zlib fsync boolean false optional Specify a file sync write concern readPreferenceTags array optional Read preference tags numberOfRetries number 5 optional The number of retries for a tailable cursor auto_reconnect boolean true optional Enable auto reconnecting for single server instances monitorCommands boolean false optional Enable command monitoring for this client minSize number optional If present, the connection pool will be initialized with minSize connections, and will never dip below minSize connections useNewUrlParser boolean true optional Determines whether or not to use the new url parser. Enables the new, spec-compliant, url parser shipped in the core driver. This url parser fixes a number of problems with the original parser, and aims to outright replace that parser in the near future. Defaults to true, and must be explicitly set to false to use the legacy url parser. useUnifiedTopology boolean optional Enables the new unified topology layer localThresholdMS Number 15 optional Only applies to the unified topology The size of the latency window for selecting among multiple suitable servers serverSelectionTimeoutMS Number 30000 optional Only applies to the unified topology How long to block for server selection before throwing an error heartbeatFrequencyMS Number 10000 optional Only applies to the unified topology The frequency with which topology updates are scheduled maxPoolSize number 10 optional Only applies to the unified topology The maximum number of connections that may be associated with a pool at a given time. This includes in use and available connections. minPoolSize number 0 optional Only applies to the unified topology The minimum number of connections that MUST exist at any moment in a single connection pool. maxIdleTimeMS number optional Only applies to the unified topology The maximum amount of time a connection should remain idle in the connection pool before being marked idle. The default is infinity. waitQueueTimeoutMS number 0 optional Only applies to the unified topology The maximum amount of time operation execution should wait for a connection to become available. The default is 0 which means there is no limit. autoEncryption AutoEncrypter~AutoEncryptionOptions optional Optionally enable client side auto encryption driverInfo DriverInfoOptions optional Allows a wrapping driver to amend the client metadata generated by the driver to include information about the wrapping driver
callback	MongoClient~connectCallback	optional The command result callback

Returns:

Promise if no callback passed

close(force, callback){Promise}

lib/mongo_client.js, line 241

Close the db and its underlying connections

Name	Type	Default	Description
force	boolean	false	optional Force close, emitting no events
callback	Db~noResultCallback		optional The result callback

Returns:

Promise if no callback passed

connect(callback){Promise.<MongoClient>}

lib/mongo_client.js, line 212

Connect to MongoDB using a url as documented at

docs.mongodb.org/manual/reference/connection-string/

Note that for replicasets the replicaSet query parameter is required in the 2.0 driver

Name	Type	Description
callback	MongoClient~connectCallback	optional The command result callback

Returns:

Promise if no callback passed

db(dbName, options){Db}

lib/mongo_client.js, line 292

Create a new Db instance sharing the current socket connections. Be aware that the new db instances are
related in a parent-child relationship to the original instance so that events are correctly emitted on child
db instances. Child db instances are cached so performing db('db1') twice will return the same instance.
You can control these behaviors with the options noListener and returnNonCachedInstance.

Name	Type	Description
dbName	string	optional The name of the database we want to use. If not provided, use database name from connection string.
options	object	optional Optional settings. Name Type Default Description noListener boolean false optional Do not make the db an event listener to the original connection. returnNonCachedInstance boolean false optional Control if you want to return a cached instance or have a new one created

isConnected(options){boolean}

lib/mongo_client.js, line 334

Check if MongoClient is connected

Name	Type	Description
options	object	optional Optional settings. Name Type Default Description noListener boolean false optional Do not make the db an event listener to the original connection. returnNonCachedInstance boolean false optional Control if you want to return a cached instance or have a new one created

startSession(options){ClientSession}

lib/mongo_client.js, line 449

Starts a new session on the server

Name	Type	Description
options	SessionOptions	optional optional settings for a driver session

Returns:

newly established session

watch(pipeline, options){ChangeStream}

lib/mongo_client.js, line 517

Create a new Change Stream, watching for new changes (insertions, updates, replacements, deletions, and invalidations) in this cluster. Will ignore all changes to system collections, as well as the local, admin,
and config databases.

Name	Type	Description
pipeline	Array	optional An array of aggregation pipeline stages through which to pass change stream documents. This allows for filtering (using $match) and manipulating the change stream documents.
options	object	optional Optional settings Name Type Default Description fullDocument string 'default' optional Allowed values: ‘default’, ‘updateLookup’. When set to ‘updateLookup’, the change stream will include both a delta describing the changes to the document, as well as a copy of the entire document that was changed from some time after the change occurred. resumeAfter object optional Specifies the logical starting point for the new change stream. This should be the _id field from a previously returned change stream document. maxAwaitTimeMS number optional The maximum amount of time for the server to wait on new documents to satisfy a change stream query batchSize number 1000 optional The number of documents to return per batch. See aggregation documentation. collation object optional Specify collation settings for operation. See aggregation documentation. readPreference ReadPreference optional The read preference. See read preference documentation. startAtOperationTime Timestamp optional receive change events that occur after the specified timestamp session ClientSession optional optional session to use for this operation

Since:

• 3.1.0

Returns:

ChangeStream instance.

withSession(options, operation){Promise}

lib/mongo_client.js, line 472

Runs a given operation with an implicitly created session. The lifetime of the session
will be handled without the need for user interaction.

NOTE: presently the operation MUST return a Promise (either explicit or implicity as an async function)

Name	Type	Description
options	Object	optional Optional settings to be appled to implicitly created session
operation	function	An operation to execute with an implicitly created session. The signature of this MUST be (session) => {}

Type Definitions

connectCallback(error, client)

lib/mongo_client.js, line 194

The callback format for results

Name	Type	Description
error	MongoError	An error instance representing the error during the execution.
client	MongoClient	The connected client.