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Interface MongoClientOptions

Describes all possible URI query options for the mongo client






ALPNProtocols?: Uint8Array | string[] | Uint8Array[]

An array of strings or a Buffer naming possible ALPN protocols. (Protocols should be ordered by their priority.)

appName?: string

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?: Auth

The auth settings for when connection to server.

authMechanism?: AuthMechanism

Specify the authentication mechanism that MongoDB will use to authenticate the connection.

authMechanismProperties?: AuthMechanismProperties

Specify properties for the specified authMechanism as a comma-separated list of colon-separated key-value pairs.

authSource?: string

Specify the database name associated with the user’s credentials.

autoEncryption?: AutoEncryptionOptions

Optionally enable client side auto encryption


Automatic encryption is an enterprise only feature that only applies to operations on a collection. Automatic encryption is not supported for operations on a database or view, and operations that are not bypassed will result in error (see libmongocrypt: Auto Encryption Allow-List). To bypass automatic encryption for all operations, set bypassAutoEncryption=true in AutoEncryptionOpts.

Automatic encryption requires the authenticated user to have the listCollections privilege action.

If a MongoClient with a limited connection pool size (i.e a non-zero maxPoolSize) is configured with AutoEncryptionOptions, a separate internal MongoClient is created if any of the following are true:

  • AutoEncryptionOptions.keyVaultClient is not passed.
  • AutoEncryptionOptions.bypassAutomaticEncryption is false.

If an internal MongoClient is created, it is configured with the same options as the parent MongoClient except minPoolSize is set to 0 and AutoEncryptionOptions is omitted.

bsonRegExp?: boolean

return BSON regular expressions as BSONRegExp instances.

ca?: string | Buffer | (string | Buffer)[]

Optionally override the trusted CA certificates. Default is to trust the well-known CAs curated by Mozilla. Mozilla's CAs are completely replaced when CAs are explicitly specified using this option.

cert?: string | Buffer | (string | Buffer)[]

Cert chains in PEM format. One cert chain should be provided per private key. Each cert chain should consist of the PEM formatted certificate for a provided private key, followed by the PEM formatted intermediate certificates (if any), in order, and not including the root CA (the root CA must be pre-known to the peer, see ca). When providing multiple cert chains, they do not have to be in the same order as their private keys in key. If the intermediate certificates are not provided, the peer will not be able to validate the certificate, and the handshake will fail.

checkKeys?: boolean

the serializer will check if keys are valid.

checkServerIdentity?: (hostname: string, cert: PeerCertificate) => Error | undefined

Type declaration

    • (hostname: string, cert: PeerCertificate): Error | undefined
    • Verifies the certificate cert is issued to hostname.

      Returns Error object, populating it with reason, host, and cert on failure. On success, returns undefined.

      This function can be overwritten by providing alternative function as part of the options.checkServerIdentity option passed to tls.connect(). The overwriting function can call tls.checkServerIdentity() of course, to augment the checks done with additional verification.

      This function is only called if the certificate passed all other checks, such as being issued by trusted CA (options.ca).




      • hostname: string

        The host name or IP address to verify the certificate against.

      • cert: PeerCertificate

        A certificate object representing the peer's certificate.

      Returns Error | undefined

ciphers?: string

Cipher suite specification, replacing the default. For more information, see modifying the default cipher suite. Permitted ciphers can be obtained via tls.getCiphers(). Cipher names must be uppercased in order for OpenSSL to accept them.

compressors?: string | ("none" | "snappy" | "zlib")[]

An array or comma-delimited string of compressors to enable network compression for communication between this client and a mongod/mongos instance.

connectTimeoutMS?: number

The time in milliseconds to attempt a connection before timing out.

crl?: string | Buffer | (string | Buffer)[]

PEM formatted CRLs (Certificate Revocation Lists).

directConnection?: boolean

Allow a driver to force a Single topology type with a connection string containing one host

driverInfo?: DriverInfo

Allows a wrapping driver to amend the client metadata generated by the driver to include information about the wrapping driver

ecdhCurve?: string

A string describing a named curve or a colon separated list of curve NIDs or names, for example P-521:P-384:P-256, to use for ECDH key agreement. Set to auto to select the curve automatically. Use crypto.getCurves() to obtain a list of available curve names. On recent releases, openssl ecparam -list_curves will also display the name and description of each available elliptic curve. Default: tls.DEFAULT_ECDH_CURVE.

enableUtf8Validation?: boolean

Enable utf8 validation when deserializing BSON documents. Defaults to true.

family?: number
fieldsAsRaw?: Document

allow to specify if there what fields we wish to return as unserialized raw buffer.

forceServerObjectId?: boolean

Force server to assign _id values instead of driver

heartbeatFrequencyMS?: number

heartbeatFrequencyMS controls when the driver checks the state of the MongoDB deployment. Specify the interval (in milliseconds) between checks, counted from the end of the previous check until the beginning of the next one.

hints?: number
ignoreUndefined?: boolean

serialize will not emit undefined fields (default:true)

journal?: boolean

The journal write concern

keepAlive?: boolean

TCP Connection keep alive enabled

keepAliveInitialDelay?: number

The number of milliseconds to wait before initiating keepAlive on the TCP socket

key?: string | Buffer | (string | Buffer | KeyObject)[]

Private keys in PEM format. PEM allows the option of private keys being encrypted. Encrypted keys will be decrypted with options.passphrase. Multiple keys using different algorithms can be provided either as an array of unencrypted key strings or buffers, or an array of objects in the form {pem: <string|buffer>[, passphrase: ]}. The object form can only occur in an array. object.passphrase is optional. Encrypted keys will be decrypted with object.passphrase if provided, or options.passphrase if it is not.

loadBalanced?: boolean

Instruct the driver it is connecting to a load balancer fronting a mongos like service

localAddress?: string
localPort?: number
localThresholdMS?: number

The size (in milliseconds) of the latency window for selecting among multiple suitable MongoDB instances.

logger?: Logger

Custom logger object

loggerLevel?: LoggerLevel

The logging level

lookup?: LookupFunction
maxIdleTimeMS?: number

The maximum number of milliseconds that a connection can remain idle in the pool before being removed and closed.

maxPoolSize?: number

The maximum number of connections in the connection pool.

maxStalenessSeconds?: number

Specifies, in seconds, how stale a secondary can be before the client stops using it for read operations.

minDHSize?: number
minHeartbeatFrequencyMS?: number

Sets the minimum heartbeat frequency. In the event that the driver has to frequently re-check a server's availability, it will wait at least this long since the previous check to avoid wasted effort.

minPoolSize?: number

The minimum number of connections in the connection pool.

monitorCommands?: boolean

Enable command monitoring for this client

noDelay?: boolean

TCP Connection no delay

passphrase?: string

Shared passphrase used for a single private key and/or a PFX.

pfx?: string | Buffer | (string | Buffer | PxfObject)[]

PFX or PKCS12 encoded private key and certificate chain. pfx is an alternative to providing key and cert individually. PFX is usually encrypted, if it is, passphrase will be used to decrypt it. Multiple PFX can be provided either as an array of unencrypted PFX buffers, or an array of objects in the form {buf: <string|buffer>[, passphrase: ]}. The object form can only occur in an array. object.passphrase is optional. Encrypted PFX will be decrypted with object.passphrase if provided, or options.passphrase if it is not.

pkFactory?: PkFactory

A primary key factory function for generation of custom _id keys

promiseLibrary?: any

A Promise library class the application wishes to use such as Bluebird, must be ES6 compatible

promoteBuffers?: boolean

when deserializing a Binary will return it as a node.js Buffer instance.

promoteLongs?: boolean

when deserializing a Long will fit it into a Number if it's smaller than 53 bits

promoteValues?: boolean

when deserializing will promote BSON values to their Node.js closest equivalent types.

proxyHost?: string

Configures a Socks5 proxy host used for creating TCP connections.

proxyPassword?: string

Configures a Socks5 proxy password when the proxy in proxyHost requires username/password authentication.

proxyPort?: number

Configures a Socks5 proxy port used for creating TCP connections.

proxyUsername?: string

Configures a Socks5 proxy username when the proxy in proxyHost requires username/password authentication.

raw?: boolean

Return document results as raw BSON buffers

readConcern?: ReadConcernLike

Specify a read concern for the collection (only MongoDB 3.2 or higher supported)

readConcernLevel?: ReadConcernLevel

The level of isolation

Specifies the read preferences for this connection

readPreferenceTags?: TagSet[]

Specifies the tags document as a comma-separated list of colon-separated key-value pairs.

rejectUnauthorized?: boolean

If true the server will reject any connection which is not authorized with the list of supplied CAs. This option only has an effect if requestCert is true.



replicaSet?: string

Specifies the name of the replica set, if the mongod is a member of a replica set.

retryReads?: boolean

Enables retryable reads.

retryWrites?: boolean

Enable retryable writes.

secureContext?: SecureContext

An optional TLS context object from tls.createSecureContext()

secureProtocol?: string

Legacy mechanism to select the TLS protocol version to use, it does not support independent control of the minimum and maximum version, and does not support limiting the protocol to TLSv1.3. Use minVersion and maxVersion instead. The possible values are listed as SSL_METHODS, use the function names as strings. For example, use 'TLSv1_1_method' to force TLS version 1.1, or 'TLS_method' to allow any TLS protocol version up to TLSv1.3. It is not recommended to use TLS versions less than 1.2, but it may be required for interoperability. Default: none, see minVersion.

serializeFunctions?: boolean

serialize the javascript functions (default:false).

serverApi?: "1" | ServerApi

Server API version

serverSelectionTimeoutMS?: number

Specifies how long (in milliseconds) to block for server selection before throwing an exception.

servername?: string
session?: Buffer
socketTimeoutMS?: number

The time in milliseconds to attempt a send or receive on a socket before the attempt times out.

srvMaxHosts?: number

The maximum number of hosts to connect to when using an srv connection string, a setting of 0 means unlimited hosts

srvServiceName?: string

Modifies the srv URI to look like:


Querying this DNS URI is expected to respond with SRV records

ssl?: boolean

A boolean to enable or disables TLS/SSL for the connection. (The ssl option is equivalent to the tls option.)

sslCA?: string

SSL Certificate file path.

sslCRL?: string

SSL Certificate revocation list file path.

sslCert?: string

SSL Certificate file path.

sslKey?: string

SSL Key file file path.

sslPass?: string

SSL Certificate pass phrase.

sslValidate?: boolean

Validate mongod server certificate against Certificate Authority

tls?: boolean

Enables or disables TLS/SSL for the connection.

tlsAllowInvalidCertificates?: boolean

Bypasses validation of the certificates presented by the mongod/mongos instance

tlsAllowInvalidHostnames?: boolean

Disables hostname validation of the certificate presented by the mongod/mongos instance.

tlsCAFile?: string

Specifies the location of a local .pem file that contains the root certificate chain from the Certificate Authority. This file is used to validate the certificate presented by the mongod/mongos instance.

tlsCertificateFile?: string

Specifies the location of a local TLS Certificate

tlsCertificateKeyFile?: string

Specifies the location of a local .pem file that contains either the client's TLS/SSL certificate and key or only the client's TLS/SSL key when tlsCertificateFile is used to provide the certificate.

tlsCertificateKeyFilePassword?: string

Specifies the password to de-crypt the tlsCertificateKeyFile.

tlsInsecure?: boolean

Disables various certificate validations.

w?: W

The write concern w value

waitQueueTimeoutMS?: number

The maximum time in milliseconds that a thread can wait for a connection to become available.

wtimeoutMS?: number

The write concern timeout

zlibCompressionLevel?: 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 9 | 8

An integer that specifies the compression level if using zlib for network compression.

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