Optional ALPNProtocolsAn array of strings or a Buffer naming possible ALPN protocols.字符串数组或缓冲区，命名可能的ALPN协议。
(Protocols should be ordered by their priority.)（协议应按优先级排序。）
Optional appThe name of the application that created this MongoClient instance. 创建此MongoClient实例的应用程序的名称。MongoDB 3.4 and newer will print this value in the server log upon establishing each connection. MongoDB 3.4及更新版本将在建立每个连接时在服务器日志中打印此值。It is also recorded in the slow query log and profile collections它也记录在慢速查询日志和配置文件集合中
Optional authThe auth settings for when connection to server.连接到服务器时的身份验证设置。
Optional authSpecify the authentication mechanism that MongoDB will use to authenticate the connection.指定MongoDB将用于对连接进行身份验证的身份验证机制。
Optional authSpecify properties for the specified authMechanism as a comma-separated list of colon-separated key-value pairs.将指定authMechanism的属性指定为逗号分隔的键值对列表。
Optional authSpecify the database name associated with the user’s credentials.指定与用户凭据关联的数据库名称。
Optional autoOptionally enable in-use auto encryption可选地启用使用中的自动加密
Automatic encryption is an enterprise only feature that only applies to operations on a collection. 自动加密是企业独有的功能，仅适用于集合上的操作。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). 数据库或视图上的操作不支持自动加密，未绕过的操作将导致错误（请参阅libmongocrypt:自动加密允许列表）。To bypass automatic encryption for all operations, set bypassAutoEncryption=true in AutoEncryptionOpts.要绕过所有操作的自动加密，请在AutoEncryptionOpts中设置bypassAutoEncryption=true。
Automatic encryption requires the authenticated user to have the listCollections privilege action.自动加密要求经过身份验证的用户具有 listCollections权限操作。
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:如果使用AutoEncryptionOptions配置了连接池大小有限（即maxPoolSize为非零）的MongoClient，则如果以下任何一项为true，则会创建一个单独的内部MongoClient:
AutoEncryptionOptions.keyVaultClientAutoEncryptionOptions.bypassAutomaticEncryptionfalse。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.如果创建了内部MongoClient，除了minPoolSize设置为0并且省略了AutoEncryptionOptions之外，它将使用与父级MongoClient相同的选项进行配置。
Optional bsonreturn BSON regular expressions as BSONRegExp instances.将BSON正则表达式作为BSONRegExp实例返回。
false
Optional caOptionally override the trusted CA certificates. （可选）覆盖受信任的CA证书。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.默认情况是信任Mozilla策划的知名CA。当使用此选项显式指定CA时，Mozilla的CA将被完全替换。
Optional certCert 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). PEM格式的证书链。每个私钥应提供一个证书链。每个证书链应按顺序由所提供私钥的PEM格式证书组成，然后是PEM格式的中间证书（如果有的话），不包括根CA（根CA必须是对等方已知的，请参阅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.当提供多个证书链时，它们不必与键中的私钥顺序相同。如果不提供中间证书，对等方将无法验证证书，并且握手将失败。
Optional checkthe serializer will check if keys are valid.序列化程序将检查键是否有效。
false
Optional checkVerifies the certificate 验证证书cert is issued to hostname.cert是否颁发给hostname。
Returns Error object, populating it with 返回reason, host, and cert on failure. Error对象，在失败时用reason、host和cert填充该对象。On success, returns undefined.成功时，返回undefined。
This function is intended to be used in combination with the 此函数旨在与checkServerIdentity option that can be passed to connect and as such operates on a certificate object. For other purposes, consider using x509.checkHost() instead.checkServerIdentity选项结合使用，该选项可传递给连接，因此可对证书对象进行操作。出于其他目的，请考虑使用x509.checkHost()。
This function can be overwritten by providing an alternative function as the 通过提供一个替代函数作为传递给options.checkServerIdentity option that is passed to tls.connect(). tls.connect()的options.checkServerIdentity选项，可以覆盖此函数。The overwriting function can call 覆盖函数当然可以调用tls.checkServerIdentity() of course, to augment the checks done with additional verification.tls.checkServerIdentity()，以通过额外的验证来增强所做的检查。
This function is only called if the certificate passed all other checks, such as being issued by trusted CA (只有当证书通过了所有其他检查（例如由受信任的CA（options.ca).options.ca）颁发）时，才会调用此函数。
Earlier versions of Node.js incorrectly accepted certificates for a given 如果存在匹配的hostname if a matching uniformResourceIdentifier subject alternative name
was present (see CVE-2021-44531). uniformResourceIdentifier主题替代名称，早期版本的Node.js错误地接受了给定hostname的证书（请参阅CVE-2021-44531）。Applications that wish to accept希望接受uniformResourceIdentifier subject alternative names can use a custom options.checkServerIdentity function that implements the desired behavior.uniformResourceIdentifier主题替代名称的应用程序可以使用实现所需行为的自定义options.checkServerIdentity函数。
The host name or IP address to verify the certificate against.用于验证证书的主机名或IP地址。
A 表示对等方证书的证书对象。certificate object representing the peer's certificate.
v0.8.4
Optional ciphersCipher suite specification, replacing the default. 密码套件规范，替换默认规范。For more information, see modifying the default cipher suite. 有关详细信息，请参阅修改默认密码套件。Permitted ciphers can be obtained via tls.getCiphers(). 允许的密码可以通过tls.getCiphers()获得。Cipher names must be uppercased in order for OpenSSL to accept them.密码名称必须大写，OpenSSL才能接受它们。
Optional compressorsAn array or comma-delimited string of compressors to enable network compression for communication between this client and a mongod/mongos instance.压缩器的数组或逗号分隔字符串，用于为此客户端和mongod/mongos实例之间的通信启用网络压缩。
Optional connectThe time in milliseconds to attempt a connection before timing out.超时前尝试连接的时间（以毫秒为单位）。
Optional crlPEM formatted CRLs (Certificate Revocation Lists).PEM格式的CRL（证书吊销列表）。
Optional directAllow a driver to force a Single topology type with a connection string containing one host允许驱动程序强制使用包含一个主机的连接字符串的单一拓扑类型
Optional driverAllows a wrapping driver to amend the client metadata generated by the driver to include information about the wrapping driver允许包装驱动程序修改驱动程序生成的客户端元数据，以包含有关包装驱动程序的信息
Optional ecdhA 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. 描述命名曲线或曲线NID或名称的冒号分隔列表的字符串，例如P-521:P-384:P-256，用于ECDH键协商。Set to auto to select the curve automatically. 设置为auto可自动选择曲线。Use 使用crypto.getCurves() to obtain a list of available curve names. crypto.getCurves()获取可用曲线名称的列表。On recent releases, openssl ecparam -list_curves will also display the name and description of each available elliptic curve. 在最近的版本中，openssl ecparam-list_curves还将显示每个可用椭圆曲线的名称和描述。Default: tls.DEFAULT_ECDH_CURVE.默认值：tls.DEFAULT_ECDH_CURVE。
Optional enableEnable utf8 validation when deserializing BSON documents. Defaults to true.在反序列化BSON文档时启用utf8验证。默认为true。
Optional familyOptional fieldsallow to specify if there what fields we wish to return as unserialized raw buffer.允许指定我们希望返回哪些字段作为未序列化的原始缓冲区。
null
Optional forceForce server to assign 强一致性务器分配_id values instead of driver_id值而不是驱动程序
Optional heartbeatheartbeatFrequencyMS controls when the driver checks the state of the MongoDB deployment. hearteatFrequencyMS控制驱动程序何时检查MongoDB部署的状态。Specify the interval (in milliseconds) between checks, counted from the end of the previous check until the beginning of the next one.指定检查之间的间隔（以毫秒为单位），从上一次检查结束到下一次检查开始计数。
Optional hintsOptional ignoreserialize will not emit undefined fields note that the driver sets this to 如果驱动程序将其设置为falsefalse，则序列化不会发出未定义的字段备注。
true
Optional journalThe journal write concernjournal写入关注
Please use the 请改用writeConcern option insteadwriteConcern选项
Optional keyPrivate keys in PEM format. PEM allows the option of private keys being encrypted. PEM格式的私钥。PEM允许选择加密私钥。Encrypted keys will be decrypted with options.passphrase. 加密的键将使用options.passphrase进行解密。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: <string>]}. 使用不同算法的多个键可以作为未加密键字符串或缓冲区的数组提供，也可以作为对象的数组提供，形式为{pem: <string|buffer>[, passphrase: <string>]}。The object form can only occur in an array. object.passphrase is optional. 对象形式只能出现在数组中。objectpassphrase是可选的。Encrypted keys will be decrypted with object.passphrase if provided, or options.passphrase if it is not.加密的键将使用object.passphrase（如果提供）进行解密，或者如果没有，则使用options.passphrase进行解密。
Optional loadInstruct the driver it is connecting to a load balancer fronting a mongos like service指示驱动程序是否连接到面向mongos类服务的负载平衡器
Optional localOptional localOptional localThe size (in milliseconds) of the latency window for selecting among multiple suitable MongoDB instances.用于在多个合适的MongoDB实例中进行选择的延迟窗口的大小（以毫秒为单位）。
Optional lookupOptional maxThe maximum number of connections that may be in the process of being established concurrently by the connection pool.连接池可能同时建立的最大连接数。
Optional maxThe maximum number of milliseconds that a connection can remain idle in the pool before being removed and closed.在删除和关闭连接之前，连接在池中可以保持空闲的最大毫秒数。
Optional maxThe maximum number of connections in the connection pool.连接池中的最大连接数。
Optional maxSpecifies, in seconds, how stale a secondary can be before the client stops using it for read operations.以秒为单位指定在客户端停止使用辅助进行读取操作之前，辅助的过时程度。
Optional minDHSizeOptional minSets 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.设置最小检测信号频率。如果驱动程序必须频繁地重新检查服务器的可用性，它将在上次检查后至少等待这么长时间，以避免浪费精力。
Optional minThe minimum number of connections in the connection pool.连接池中的最小连接数。
Optional monitorEnable command monitoring for this client对此客户端启用命令监视
Optional noTCP Connection no delayTCP连接无延迟
Optional passphraseShared passphrase used for a single private key and/or a PFX.用于单个私钥和/或PFX的共享密码短语。
Optional pfxPFX or PKCS12 encoded private key and certificate chain. PFX或PKCS12编码的私钥和证书链。pfx is an alternative to providing key and cert individually. pfx是单独提供键和证书的替代方案。PFX is usually encrypted, if it is, passphrase will be used to decrypt it. PFX通常是加密的，如果是，密码短语将用于解密。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: <string>]}. 多个PFX可以作为未加密PFX缓冲区的数组提供，也可以作为对象数组提供，格式为{buf: <string|buffer>[, passphrase: <string>]}。The object form can only occur in an array. object.passphrase is optional. 对象形式只能出现在数组中。object.passphrase是可选的。Encrypted PFX will be decrypted with object.passphrase if provided, or options.passphrase if it is not.加密的PFX将使用object.passphrase（如果提供）进行解密，或者如果没有，则使用options.passphrase进行解密。
Optional pkA primary key factory function for generation of custom 用于生成自定义_id keys_id键的主键工厂函数
Optional promotewhen deserializing a Binary will return it as a node.js Buffer instance.当反序列化Binary时，它将作为node.js Buffer实例返回。
false
Optional promotewhen deserializing a Long will fit it into a Number if it's smaller than 53 bits.当反序列化Long时，如果它小于53位，则将其放入Number中。
true
Optional promotewhen deserializing will promote BSON values to their Node.js closest equivalent types.反序列化时将BSON值提升为其Node.js最接近的等效类型。
true
Optional proxyConfigures a Socks5 proxy host used for creating TCP connections.配置用于创建TCP连接的Socks5代理主机。
Optional proxyConfigures a Socks5 proxy password when the proxy in proxyHost requires username/password authentication.当proxyHost中的代理需要用户名/密码身份验证时，配置Socks5代理密码。
Optional proxyConfigures a Socks5 proxy port used for creating TCP connections.配置用于创建TCP连接的Socks5代理端口。
Optional proxyConfigures a Socks5 proxy username when the proxy in proxyHost requires username/password authentication.当proxyHost中的代理需要用户名/密码身份验证时，配置Socks5代理用户名。
Optional rawEnabling the raw option will return a Node.js Buffer which is allocated using allocUnsafe API.启用raw选项将返回使用allocUnsafe API分配的Node.js缓冲区。
See this section from the Node.js Docs here for more detail about what "unsafe" refers to in this context.请参阅Node.js文档中的这一部分，了解有关“不安全”在本文中所指内容的更多详细信息。
If you need to maintain your own editable clone of the bytes returned for an extended life time of the process, it is recommended you allocate your own buffer and clone the contents:如果您需要维护自己的可编辑字节克隆，以延长进程的使用寿命，建议您分配自己的缓冲区并克隆内容：
const raw = await collection.findOne({}, { raw: true });
const myBuffer = Buffer.alloc(raw.byteLength);
myBuffer.set(raw, 0);
// Only save and use `myBuffer` beyond this point
Please note there is a known limitation where this option cannot be used at the MongoClient level (see NODE-3946).请注意，有一个已知的限制，即此选项不能在MongoClient级别使用（请参阅NODE-3946）。
It does correctly work at 它在Db, Collection, and per operation the same as other BSON options work.Db、Collection和每个操作中都能正常工作，与其他BSON选项的工作方式相同。
Optional readSpecify a read concern for the collection (only MongoDB 3.2 or higher supported)指定集合的读取关注（仅支持MongoDB 3.2或更高版本）
Optional readThe level of isolation隔离级别
Optional readSpecifies the read preferences for this connection指定此连接的读取首选项
Optional readSpecifies the tags document as a comma-separated list of colon-separated key-value pairs.将标记文档指定为逗号分隔的键值对列表。
Optional rejectIf true the server will reject any connection which is not authorized with the list of supplied CAs. 如果为true，则服务器将拒绝未经所提供CA列表授权的任何连接。This option only has an effect if requestCert is true.只有当requestCert为true时，此选项才有效。
true
Optional replicaSpecifies the name of the replica set, if the mongod is a member of a replica set.如果mongod是副本集的成员，则指定副本集的名称。
Optional retryEnables retryable reads.启用可重试读取。
Optional retryEnable retryable writes.启用可重试写入。
Optional secureAn optional TLS context object from tls.createSecureContext()tls.createSecureContext()中的可选TLS上下文对象
Optional secureLegacy 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. 传统机制选择TLS协议版本使用，它不支持独立控制最低和最高版本，也不支持将协议限制为TLSv1.3。Use minVersion and maxVersion instead. The possible values are listed as SSL_METHODS, use the function names as strings. 请改用minVersion和maxVersion。可能的值列为SSL_METHODS，将函数名用作字符串。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. 例如，使用“TLSv1_method”强制TLS版本1.1，或使用“TLS_method”允许TLSv1.3以下的任何TLS协议版本。It is not recommended to use TLS versions less than 1.2, but it may be required for interoperability. Default: none, see minVersion.不建议使用低于1.2的TLS版本，但可能需要使用该版本才能实现互操作性。默认值：none，请参阅minVersion。
Optional serializeserialize the javascript functions序列化javascript函数
false
Optional serverServer API version
Optional serverSpecifies how long (in milliseconds) to block for server selection before throwing an exception.指定在引发异常之前阻止服务器选择的时间（以毫秒为单位）。
Optional servernameOptional sessionAn optional Buffer instance containing a TLS session.包含TLS会话的可选缓冲区实例。
Optional socketThe time in milliseconds to attempt a send or receive on a socket before the attempt times out.在尝试超时之前，在套接字上尝试发送或接收的时间（以毫秒为单位）。
Optional srvThe maximum number of hosts to connect to when using an srv connection string, a setting of 使用srv连接字符串时要连接到的最大主机数，设置为0 means unlimited hosts0表示主机不受限制
Optional srvModifies the srv URI to look like:修改srv URI，使其看起来像：
_{srvServiceName}._tcp.{hostname}.{domainname}
Querying this DNS URI is expected to respond with SRV records查询此DNS URI应使用SRV记录进行响应
Optional sslA boolean to enable or disables TLS/SSL for the connection. 用于为连接启用或禁用TLS/SSL的布尔值。(The ssl option is equivalent to the tls option.)（ssl选项相当于tls选项。）
Optional tlsEnables or disables TLS/SSL for the connection.为连接启用或禁用TLS/SSL。
Optional tlsBypasses validation of the certificates presented by the mongod/mongos instance绕过mongod/mongos实例提供的证书验证
Optional tlsDisables hostname validation of the certificate presented by the mongod/mongos instance.禁用mongod/mongos实例提供的证书的主机名验证。
Optional tlsCAFileSpecifies the location of a local .pem file that contains the root certificate chain from the Certificate Authority. 指定本地pem文件的位置，该文件包含来自证书颁发机构的根证书链。This file is used to validate the certificate presented by the mongod/mongos instance.此文件用于验证mongod/mongos实例提供的证书。
Optional tlsCRLFileSpecifies the location of a local CRL .pem file that contains the client revokation list.指定包含客户端吊销列表的本地CRL pem文件的位置。
Optional tlsSpecifies the location of a local .pem file that contains either the client's TLS/SSL certificate and key.指定本地.pem文件的位置，该文件包含客户端的TLS/SSL证书和键。
Optional tlsSpecifies the password to de-crypt the tlsCertificateKeyFile.指定对tlsCertificateKeyFile进行解密的密码。
Optional tlsDisables various certificate validations.禁用各种证书验证。
Optional usewhen deserializing a Long return as a BigInt.当将Long返回反序列化为BigInt时。
false
Optional wThe write concern w value写入关注w值
Please use the 请改用writeConcern option insteadwriteConcern选项
Optional waitThe maximum time in milliseconds that a thread can wait for a connection to become available.线程可以等待连接可用的最长时间（以毫秒为单位）。
Optional writeA MongoDB WriteConcern, which describes the level of acknowledgement requested from MongoDB for write operations.一个MongoDB WriteConcern，它描述了MongoDB针对写入操作请求的确认级别。
Optional wtimeoutMSThe write concern timeout写入关注超时
Please use the 请改用writeConcern option insteadwriteConcern选项
Optional zlibAn integer that specifies the compression level if using zlib for network compression.如果使用zlib进行网络压缩，则指定压缩级别的整数。
Generated using TypeDoc
Describes all possible URI query options for the mongo client描述mongo客户端的所有可能的URI查询选项See
/v7.0/reference/connection-string