v6.9.0

6.9.0 (2024-09-06)

The MongoDB Node.js team is pleased to announce version 6.9.0 of the mongodb package!

Release Notes

Driver support of upcoming MongoDB server release

Increased the driver's max supported Wire Protocol version and server version in preparation for the upcoming release of MongoDB 8.0.

MongoDB 3.6 server support deprecated

Warning

Support for 3.6 servers is deprecated and will be removed in a future version.

Support for explicit resource management

The driver now natively supports explicit resource management for MongoClient, ClientSession, ChangeStreams and cursors. Additionally, on compatible Node.js versions, explicit resource management can be used with cursor.stream() and the GridFSDownloadStream, since these classes inherit resource management from Node.js' readable streams.

This feature is experimental and subject to changes at any time. This feature will remain experimental until the proposal has reached stage 4 and Node.js declares its implementation of async disposable resources as stable.

To use explicit resource management with the Node driver, you must:

• Use Typescript 5.2 or greater (or another bundler that supports resource management)
• Enable tslib polyfills for your application
• Either use a compatible Node.js version or polyfill Symbol.asyncDispose (see the TS 5.2 release announcement for more information).

Explicit resource management is a feature that ensures that resources' disposal methods are always called when the resources' scope is exited. For driver resources, explicit resource management guarantees that the resources' corresponding close method is called when the resource goes out of scope.

// before:
{
  try {
    const client = MongoClient.connect('<uri>');
    try {
      const session = client.startSession();
      const cursor = client.db('my-db').collection("my-collection").find({}, { session });
      try {
        const doc = await cursor.next();
      } finally {
        await cursor.close();
      }
    } finally {
      await session.endSession();
    }
  } finally {
    await client.close();
  }
}

// with explicit resource management:
{
  await using client = MongoClient.connect('<uri>');

  await using session = client.startSession();
  await using cursor = client.db('my-db').collection('my-collection').find({}, { session });

  const doc = await cursor.next();
}
// outside of scope, the cursor, session and mongo client will be cleaned up automatically.

The full explicit resource management proposal can be found here.

Driver now supports auto selecting between IPv4 and IPv6 connections

For users on Node versions that support the autoSelectFamily and autoSelectFamilyAttemptTimeout options (Node 18.13+), they can now be provided to the MongoClient and will be passed through to socket creation. autoSelectFamily will default to true with autoSelectFamilyAttemptTimeout by default not defined. Example:

const client = new MongoClient(process.env.MONGODB_URI, { autoSelectFamilyAttemptTimeout: 100 });

Allow passing through allowPartialTrustChain Node.js TLS option

This option is now exposed through the MongoClient constructor's options parameter and controls the X509_V_FLAG_PARTIAL_CHAIN OpenSSL flag.

Fixed enableUtf8Validation option

Starting in v6.8.0 we inadvertently removed the ability to disable UTF-8 validation when deserializing BSON. Validation is normally a good thing, but it was always meant to be configurable and the recent Node.js runtime issues (v22.7.0) make this option indispensable for avoiding errors from mistakenly generated invalid UTF-8 bytes.

Add duration indicating time elapsed between connection creation and when the connection is ready

ConnectionReadyEvent now has a durationMS property that represents the time between the connection creation event and when the connection ready event is fired.

Add duration indicating time elapsed between the beginning and end of a connection checkout operation

ConnectionCheckedOutEvent/ConnectionCheckFailedEvent now have a durationMS property that represents the time between checkout start and success/failure.

Create native cryptoCallbacks 🔐

Node.js bundles OpenSSL, which means we can access the crypto APIs from C++ directly, avoiding the need to define them in JavaScript and call back into the JS engine to perform encryption. Now, when running the bindings in a version of Node.js that bundles OpenSSL 3 (should correspond to Node.js 18+), the cryptoCallbacks option will be ignored and C++ defined callbacks will be used instead. This improves the performance of encryption dramatically, as much as 5x faster. 🚀

This improvement was made to [email protected] which is available now!

Only permit mongocryptd spawn path and arguments to be own properties

We have added some defensive programming to the options that specify spawn path and spawn arguments for mongocryptd due to the sensitivity of the system resource they control, namely, launching a process. Now, mongocryptdSpawnPath and mongocryptdSpawnArgs must be own properties of autoEncryption.extraOptions. This makes it more difficult for a global prototype pollution bug related to these options to occur.

Support for range v2: Queryable Encryption supports range queries

Queryable encryption range queries are now officially supported. To use this feature, you must:

• use a version of mongodb-client-encryption > 6.1.0
• use a Node driver version > 6.9.0
• use an 8.0+ MongoDB enterprise server

Important

Collections and documents encrypted with range queryable fields with a 7.0 server are not compatible with range queries on 8.0 servers.

Documentation for queryable encryption can be found in the MongoDB server manual.

insertMany and bulkWrite accept ReadonlyArray inputs

This improves the typescript developer experience, developers tend to use ReadonlyArray because it can help understand where mutations are made and when enabling noUncheckedIndexedAccess leads to a better type narrowing experience.

Please note, that the array is read only but not the documents, the driver adds _id fields to your documents unless you request that the server generate the _id with forceServerObjectId

Fix retryability criteria for write concern errors on pre-4.4 sharded clusters

Previously, the driver would erroneously retry writes on pre-4.4 sharded clusters based on a nested code in the server response (error.result.writeConcernError.code). Per the common drivers specification, retryability should be based on the top-level code (error.code). With this fix, the driver avoids unnecessary retries.

The LocalKMSProviderConfiguration's key property accepts Binary for auto encryption

In #4160 we fixed a type issue where a local KMS provider at runtime accepted a BSON Binary instance but the Typescript inaccurately only permitted Buffer and string. The same change has now been applied to AutoEncryptionOptions.

BulkOperationBase (superclass of UnorderedBulkOperation and OrderedBulkOperation) now reports length property in Typescript

The length getter for these classes was defined manually using Object.defineProperty which hid it from typescript. Thanks to @sis0k0 we now have the getter defined on the class, which is functionally the same, but a greatly improved DX when working with types. 🎉

MongoWriteConcernError.code is overwritten by nested code within MongoWriteConcernError.result.writeConcernError.code

MongoWriteConcernError is now correctly formed such that the original top-level code is preserved

• If no top-level code exists, MongoWriteConcernError.code should be set to MongoWriteConcernError.result.writeConcernError.code
• If a top-level code is passed into the constructor, it shouldn't be changed or overwritten by the nested writeConcernError.code

Optimized cursor.toArray()

Prior to this change, toArray() simply used the cursor's async iterator API, which parses BSON documents lazily (see more here). toArray(), however, eagerly fetches the entire set of results, pushing each document into the returned array. As such, toArray does not have the same benefits from lazy parsing as other parts of the cursor API.

With this change, when toArray() accumulates documents, it empties the current batch of documents into the array before calling the async iterator again, which means each iteration will fetch the next batch rather than wrap each d...

v6.8.2

6.8.2 (2024-09-12)

The MongoDB Node.js team is pleased to announce version 6.8.2 of the mongodb package!

Release Notes

Fixed mixed use of cursor.next() and cursor[Symbol.asyncIterator]

In 6.8.0, we inadvertently prevented the use of cursor.next() along with using for await syntax to iterate cursors. If your code made use of the following pattern and the call to cursor.next retrieved all your documents in the first batch, then the for-await loop would never be entered. This issue is now fixed.

const firstDoc = await cursor.next();

for await (const doc of cursor) {
    // process doc
    // ...
}

Bug Fixes

• NODE-6367: enable mixed use of iteration APIs (#4234) (d63bf6f)

Documentation

• Reference
• API
• Changelog

We invite you to try the mongodb library immediately, and report any issues to the NODE project.

v6.8.1

6.8.1 (2024-09-06)

The MongoDB Node.js team is pleased to announce version 6.8.1 of the mongodb package!

Release Notes

Fixed enableUtf8Validation option

Starting in v6.8.0 we inadvertently removed the ability to disable UTF-8 validation when deserializing BSON. Validation is normally a good thing, but it was always meant to be configurable and the recent Node.js runtime issues (v22.7.0) make this option indispensable for avoiding errors from mistakenly generated invalid UTF-8 bytes.

Bug Fixes

• NODE-6355: respect utf8 validation option when iterating cursors (#4220) (886cefb)

Documentation

• Reference
• API
• Changelog

We invite you to try the mongodb library immediately, and report any issues to the NODE project.

v6.8.0

6.8.0 (2024-06-27)

The MongoDB Node.js team is pleased to announce version 6.8.0 of the mongodb package!

Release Notes

Add ReadConcernMajorityNotAvailableYet to retryable errors

ReadConcernMajorityNotAvailableYet (error code 134) is now a retryable read error.

ClientEncryption.createDataKey() and other helpers now support named KMS providers

KMS providers can now be associated with a name and multiple keys can be provided per-KMS provider. The following example configures a ClientEncryption object with multiple AWS keys:

const clientEncryption = new ClientEncryption(keyVaultClient, {
  'aws:key1': {
    accessKeyId: ...,
    secretAccessKey: ...
  },
  'aws:key2': {
    accessKeyId: ...,
    secretAccessKey: ...
  },
  
clientEncryption.createDataKey('aws:key-1', { ... });

Named KMS providers are supported for azure, AWS, KMIP, local and gcp KMS providers. Named KMS providers cannot be used if the application is using the automatic KMS provider refresh capability.

This feature requires mongodb-client-encryption>=6.0.1.

KMIP data keys now support a delegated option

When creating a KMIP data key, delegated can now be specified. If true, the KMIP provider will perform encryption / decryption of the data key locally, ensuring that the encryption key never leaves the KMIP server.

clientEncryption.createDataKey('kmip', { masterKey: { delegated: true } } );

This feature requires mongodb-client-encryption>=6.0.1.

Cursor responses are now parsed lazily 🦥

MongoDB cursors (find, aggregate, etc.) operate on batches of documents equal to batchSize. Each time the driver runs out of documents for the current batch it gets more (getMore) and returns each document one at a time through APIs like cursor.next() or for await (const doc of cursor).

Prior to this change, the Node.js driver was designed in such a way that the entire BSON response was decoded after it was received. Parsing BSON, just like parsing JSON, is a synchronous blocking operation. This means that throughout a cursor's lifetime invocations of .next() that need to fetch a new batch hold up on parsing batchSize (default 1000) documents before returning to the user.

In an effort to provide more responsiveness, the driver now decodes BSON "on demand". By operating on the layers of data returned by the server, the driver now receives a batch, and only obtains metadata like size, and if there are more documents to iterate after this batch. After that, each document is parsed out of the BSON as the cursor is iterated.

A perfect example of where this comes in handy is our beloved mongosh! 💚

test> db.test.find()
[
	{ _id: ObjectId('665f7fc5c9d5d52227434c65'), ... },
  ...
]
Type "it" for more

That Type "it" for more message would now print after parsing only the documents displayed rather than after the entire batch is parsed.

Add Signature to Github Releases

The Github release for the mongodb package now contains a detached signature file for the NPM package (named
mongodb-X.Y.Z.tgz.sig), on every major and patch release to 6.x and 5.x. To verify the signature, follow the instructions in the 'Release Integrity' section of the README.md file.

The LocalKMSProviderConfiguration's key property accepts Binary

A local KMS provider at runtime accepted a BSON Binary instance but the Typescript inaccurately only permitted Buffer and string.

Clarified cursor state properties

The cursor has a few properties that represent the current state from the perspective of the driver and server. This PR corrects an issue that never made it to a release but we would like to take the opportunity to re-highlight what each of these properties mean.

• cursor.closed - cursor.close() has been called, and there are no more documents stored in the cursor.
• cursor.killed - cursor.close() was called while the cursor still had a non-zero id, and the driver sent a killCursors command to free server-side resources
• cursor.id == null - The cursor has yet to send it's first command (ex. find, aggregate)
• cursor.id.isZero() - The server sent the driver a cursor id of 0 indicating a cursor no longer exists on the server side because all data has been returned to the driver.
• cursor.bufferedCount() - The amount of documents stored locally in the cursor.

Features

• NODE-5718: add ReadConcernMajorityNotAvailableYet to retryable errors (#4154) (4f32dec)
• NODE-5801: allow multiple providers providers per type (#4137) (4d209ce)
• NODE-5853: support delegated KMIP data key option (#4129) (aa429f8)
• NODE-6136: parse cursor responses on demand (#4112) (3ed6a2a)
• NODE-6157: add signature to github releases (#4119) (f38c5fe)

Bug Fixes

• NODE-5801: use more specific key typing for multiple KMS provider support (#4146) (465ffd9)
• NODE-6085: add TS support for KMIP data key options (#4128) (f790cc1)
• NODE-6241: allow Binary as local KMS provider key (#4160) (fb724eb)
• NODE-6242: close becomes true after calling close when documents still remain (#4161) (e3d70c3)

Documentation

• Reference
• API
• Changelog

We invite you to try the mongodb library immediately, and report any issues to the NODE project.

v6.7.0

6.7.0 (2024-05-29)

The MongoDB Node.js team is pleased to announce version 6.7.0 of the mongodb package!

Release Notes

Support for MONGODB-OIDC Authentication

MONGODB-OIDC is now supported as an authentication mechanism for MongoDB server versions 7.0+. The currently supported facets to authenticate with are callback authentication, human interaction callback authentication, Azure machine authentication, and GCP machine authentication.

Azure Machine Authentication

The MongoClient must be instantiated with authMechanism=MONGODB-OIDC in the URI or in the client options. Additional required auth mechanism properties of TOKEN_RESOURCE and ENVIRONMENT are required and another optional username can be provided. Example:

const client = new MongoClient('mongodb+srv://<username>@<host>:<port>/?authMechanism=MONGODB-OIDC&authMechanismProperties=TOKEN_RESOURCE:<azure_token>,ENVIRONMENT:azure');
await client.connect();

GCP Machine Authentication

The MongoClient must be instantiated with authMechanism=MONGODB-OIDC in the URI or in the client options. Additional required auth mechanism properties of TOKEN_RESOURCE and ENVIRONMENT are required. Example:

const client = new MongoClient('mongodb+srv://<host>:<port>/?authMechanism=MONGODB-OIDC&authMechanismProperties=TOKEN_RESOURCE:<gcp_token>,ENVIRONMENT:gcp');
await client.connect();

Callback Authentication

The user can provide a custom callback to the MongoClient that returns a valid response with an access token. The callback is provided as an auth mechanism property an has the signature of:

const oidcCallBack = (params: OIDCCallbackParams): Promise<OIDCResponse> => {
  // params.timeoutContext is an AbortSignal that will abort after 30 seconds for non-human and 5 minutes for human.
  // params.version is the current OIDC API version.
  // params.idpInfo is the IdP info returned from the server.
  // params.username is the optional username.

  // Make a call to get a token.
  const token = ...;
  return {
     accessToken: token,
     expiresInSeconds: 300,
     refreshToken: token
  };
}

const client = new MongoClient('mongodb+srv://<host>:<port>/?authMechanism=MONGODB-OIDC', {
  authMechanismProperties: {
    OIDC_CALLBACK: oidcCallback
  }
});
await client.connect();

For callbacks that require human interaction, set the callback to the OIDC_HUMAN_CALLBACK property:

const client = new MongoClient('mongodb+srv://<host>:<port>/?authMechanism=MONGODB-OIDC', {
  authMechanismProperties: {
    OIDC_HUMAN_CALLBACK: oidcCallback
  }
});
await client.connect();

Fixed error when useBigInt64=true was set on Db or MongoClient

Fixed an issue where when setting useBigInt64=true on MongoClients or Dbs an internal function compareTopologyVersion would throw an error when encountering a bigint value.

Features

• NODE-5464: OIDC machine and callback workflow (#3912) (2ba8434)

Bug Fixes

• NODE-6165: useBigInt64 causes compareTopologyVersion to throw (#4109) (21b729b)

Documentation

• Reference
• API
• Changelog

We invite you to try the mongodb library immediately, and report any issues to the NODE project.

v6.6.2

6.6.2 (2024-05-15)

The MongoDB Node.js team is pleased to announce version 6.6.2 of the mongodb package!

Release Notes

Server Selection performance regression due to incorrect RTT measurement

Starting in version 6.6.0, when using the stream server monitoring mode, heartbeats were incorrectly timed as having a duration of 0, leading to server selection viewing each server as equally desirable for selection.

Bug Fixes

• NODE-6171: RTT set to zero when serverMonitoringMode=stream (#4110) (7a7ec5b)

Documentation

• Reference
• API
• Changelog

We invite you to try the mongodb library immediately, and report any issues to the NODE project.

v6.6.1

6.6.1 (2024-05-06)

The MongoDB Node.js team is pleased to announce version 6.6.1 of the mongodb package!

Release Notes

ref()-ed timer keeps event loop running until client.connect() resolves

When the MongoClient is first starting up (client.connect()) monitoring connections begin the process of discovering servers to make them selectable. The ref()-ed serverSelectionTimeoutMS timer keeps Node.js' event loop running as the monitoring connections are created. In the last release we inadvertently unref()-ed this initial timer which would allow Node.js to close before the monitors could create connections.

Bug Fixes

• NODE-6151: MongoClient connect does not keep Node.js running (#4101) (7e0d9e6)

Documentation

• Reference
• API
• Changelog

We invite you to try the mongodb library immediately, and report any issues to the NODE project.

v6.6.0

6.6.0 (2024-05-02)

The MongoDB Node.js team is pleased to announce version 6.6.0 of the mongodb package!

Release Notes

Aggregation pipelines can now add stages manually

When creating an aggregation pipeline cursor, a new generic method addStage() has been added in the fluid API for users to add aggregation pipeline stages in a general manner.

const documents = await users.aggregate().addStage({ $project: { name: true } }).toArray();

Thank you @prenaissance for contributing this feature!

cause and package name included for MongoMissingDependencyErrors

MongoMissingDependencyErrors now include a cause and a dependencyName field, which can be used to programmatically determine which package is missing and why the driver failed to load it.

For example:

MongoMissingDependencyError: The iHateJavascript module does not exist
    at findOne (mongodb/main.js:7:11)
    at Object.<anonymous> (mongodb/main.js:14:1)
    ... 3 lines matching cause stack trace ...
    at Module._load (node:internal/modules/cjs/loader:1021:12) {
  dependencyName: 'iHateJavascript',
  [Symbol(errorLabels)]: Set(0) {},
  [cause]: Error: Cannot find module 'iHateJavascript'
  Require stack:
  - mongodb/main.js
      at require (node:internal/modules/helpers:179:18)
      at findOne (mongodb/main.js:5:5)
      at Object.<anonymous> (mongodb/main.js:14:1) {
    code: 'MODULE_NOT_FOUND',
    requireStack: [ 'mongodb/main.js' ]
  }
}

ServerDescription Round Trip Time (RTT) measurement changes

(1) ServerDescription.roundTripTime is now a moving average

Previously, ServerDescription.roundTripTime was calculated as a weighted average of the most recently observed heartbeat duration and the previous duration. This update changes this behaviour to average ServerDescription.roundTripTime over the last 10 observed heartbeats. This should reduce the likelihood that the selected server changes as a result of momentary spikes in server latency.

(2) Added minRoundTripTime to ServerDescription

A new minRoundTripTime property is now available on the ServerDescription class which gives the minimum RTT over the last 10 heartbeats. Note that this value will be reported as 0 when fewer than 2 samples have been observed.

type supported in SearchIndexDescription

It is now possible to specify the type of a search index when creating a search index:

const indexName = await collection.createSearchIndex({
  name: 'my-vector-search-index',
  // new! specifies that a `vectorSearch` index is created
  type: 'vectorSearch',
  definition: {
    mappings: { dynamic: false }
  }
});

Collection.findOneAndModify's UpdateFilter.$currentDate no longer throws on collections with limited schema

Example:

// collection has no schema
collection.update(
    $currentData: {
       lastModified: true
    } // no longer throws a TS error
);

TopologyDescription now properly stringifies itself to JSON

The TopologyDescription class is exposed by the driver in server selection errors and topology monitoring events to provide insight into the driver's current representation of the server's topology and to aid in debugging. However, the TopologyDescription uses Maps internally, which get serialized to {} when JSON stringified. We recommend using Node's util.inspect() helper to print topology descriptions because inspect properly handles all JS types and all types we use in the driver. However, if JSON must be used, the TopologyDescription now provides a custom toJSON() hook:

client.on('topologyDescriptionChanged', ({ newDescription }) => {
   // recommended!
	console.log('topology description changed', inspect(newDescription, { depth: Infinity, colors: true }))

    // now properly prints the entire topology description
	console.log('topology description changed', JSON.stringify(newDescription))
});

Omit readConcern and writeConcern in Collection.listSearchIndexes options argument

Important

readConcern and writeConcern are no longer viable keys in the options argument passed into Collection.listSearchIndexes

This type change is a correctness fix.

Collection.listSearchIndexes is an Atlas specific method, and Atlas' search indexes do not support readConcern and writeConcern options. The types for this function now reflect this functionality.

Don't throw error when non-read operation in a transaction has a ReadPreferenceMode other than 'primary'

The following error will now only be thrown when a user provides a ReadPreferenceMode other than primary and then tries to perform a command that involves a read:

new MongoTransactionError('Read preference in a transaction must be primary');

Prior to this change, the Node Driver would incorrectly throw this error even when the operation does not perform a read.
Note: a RunCommandOperation is treated as a read operation for this error.

TopologyDescription.error type is MongoError

Important

The TopologyDescription.error property type is now MongoError rather than MongoServerError.

This type change is a correctness fix.

Before this change, the following errors that were not instances of MongoServerError were already passed into TopologyDescription.error at runtime:

• MongoNetworkError (excluding MongoNetworkRuntimeError)
• MongoError with a MongoErrorLabel.HandshakeError label

indexExists() no longer supports the full option

The Collection.indexExists() helper supported an option, full, that modified the internals of the method. When full was set to true, the driver would always return false, regardless of whether or not the index exists.

The full option is intended to modify the return type of index enumeration APIs (Collection.indexes() and Collection.indexInformation(), but since the return type of Collection.indexExists() this option does not make sense for the Collection.indexExists() helper.

We have removed support for this option.

indexExists(), indexes() and indexInformation() support cursor options in Typescript

These APIs have supported cursor options at runtime since the 4.x version of the driver, but our Typescript has incorrectly omitted cursor options from these APIs.

Index information helpers have accurate Typescript return types

Collection.indexInformation(), Collection.indexes() and Db.indexInformation() are helpers that return index information for a given collection or database. These helpers take an option, full, that configures whether the return value contains full index descriptions or a compact summary:

collection.indexes({ full: true });   // returns an array of index descriptions
collection.indexes({ full: false });  // returns an object, mapping index names to index keys

However, the Typescript return type of these helpers was always Document. Thanks to @prenaissance, these helpers now have accurate type information! The helpers return a new type, IndexDescriptionCompact | IndexDescriptionInfo[], which accurately reflects the return type of these helpers. The helpers also support type narrowing by providing a boolean literal as an option to the API:

collection.indexes();   // returns `IndexDescriptionCompact | IndexDescriptionInfo[]`
collection.indexes({ full: false });  // returns an `IndexDescriptionCompact`
collection.indexes({ full: true });  // returns an `IndexDescriptionInfo[]`

collection.indexInfo();   // returns `IndexDescriptionCompact | IndexDescriptionInfo[]`
collection.indexInfo({ full: false });  // returns an `IndexDescriptionCompact`
collection.indexInfo({ full: true });  // returns an `IndexDescriptionInfo[]`

db.indexInfo();   // returns `IndexDescriptionCompact | IndexDescriptionInfo[]`
db.indexInfo({ full: false });  // returns an `IndexDescriptionCompact`
db.indexInfo({ full: true });  // returns an `IndexDescriptionInfo[]`

AWS credentials with expirations no longer throw when using on-demand AWS KMS credentials

In addition to letting users provide KMS credentials manually, client-side encryption supports fetching AWS KMS credentials on-demand using the AWS SDK. However, AWS credential mechanisms that returned access keys with expiration timestamps caused the driver to throw an error.

The driver will no longer throw an error when receiving an expiration token from the AWS SDK.

ClusterTime interface signature optionality

The ClusterTime interface incorrectly reported the signature field as required, the server may omit it, so the typescript has been updated to reflect reality.

Summary

Features

• NODE-3639: add a general stage to the aggregation pipeline builder (#4079) (8fca1aa)
• NODE-5678: add options parsing support for timeoutMS and defaultTimeoutMS (#4068) (ddd1e81)
• NODE-5762: include cause and package name for all MongoMissingDependencyErrors (#4067) (62ea94b)
• NODE-5825: add minRoundTripTime to ServerDescription and change roundTripTime to a moving average ([#40...

v6.5.0

6.5.0 (2024-03-11)

The MongoDB Node.js team is pleased to announce version 6.5.0 of the mongodb package!

Release Notes

Bulk Write Operations Generate Ids using pkFactory

When performing inserts, the driver automatically generates _ids for each document if there is no _id present. By default, the driver generates ObjectIds. An option, pkFactory, can be used to configure the driver to generate _ids that are not object ids.

For a long time, only Collection.insert and Collection.insertMany actually used the pkFactory, if configured. Notably, Collection.bulkWrite(), Collection.initializeOrderedBulkOp() and Collection.initializeOrderedBulkOp() always generated ObjectIds, regardless of what was configured on collection.

The driver always generates _ids for inserted documents using the pkFactory.

Caution

If you are using a pkFactory and performing bulk writes, you may have inserted data into your database that does not have _ids generated by the pkFactory.

Fixed applying read preference to commands depending on topology

When connecting to a secondary in a replica set with a direct connection, if a read operation is performed, the driver attaches a read preference of primaryPreferred to the command.

Fixed memory leak in Connection layer

The Connection class has recently been refactored to operate on our socket operations using promises. An oversight how we made async network operations interruptible made new promises for every operation. We've simplified the approach and corrected the leak.

Query SRV and TXT records in parallel

When connecting using a convenient SRV connection string (mongodb+srv://) hostnames are obtained from an SRV dns lookup and some configuration options are obtained from a TXT dns query. Those DNS operations are now performed in parallel to reduce first-time connection latency.

Container and Kubernetes Awareness

The Node.js driver now keeps track of container metadata in the client.env.container field of the handshake document.

If space allows, the following metadata will be included in client.env.container:

env?: { 
  container?: {
    orchestrator?: 'kubernetes' // if process.env.KUBERNETES_SERVICE_HOST is set
    runtime?: 'docker' // if the '/.dockerenv' file exists
  } 
}

Note: If neither Kubernetes nor Docker is present, client.env will not have the container property.

Add property errorResponse to MongoServerError

The MongoServer error maps keys from the error document returned by the server on to itself. There are some use cases where the original error document is desirable to obtain in isolation. So now, the mongoServerError.errorResponse property stores a reference to the error document returned by the server.

Deprecated unused CloseOptions interface

The CloseOptions interface was unintentionally made public and was only intended for use in the driver's internals. Due to recent refactoring (NODE-5915), this interface is no longer used in the driver. Since it was marked public, out of an abundance of caution we will not be removing it outside of a major version, but we have deprecated it and will be removing it in the next major version.

Features

• NODE-5968: container and Kubernetes awareness in client metadata (#4005) (28b7040)
• NODE-5988: Provide access to raw results doc on MongoServerError (#4016) (c023242)
• NODE-6008: deprecate CloseOptions interface (#4030) (f6cd8d9)

Bug Fixes

• NODE-5636: generate _ids using pkFactory in bulk write operations (#4025) (fbb5059)
• NODE-5981: read preference not applied to commands properly (#4010) (937c9c8)
• NODE-5985: throw Nodejs' certificate expired error when TLS fails to connect instead of CERT_HAS_EXPIRED (#4014) (057c223)
• NODE-5993: memory leak in the Connection class (#4022) (69de253)

Performance Improvements

• NODE-5986: parallelize SRV/TXT resolution (#4012) (eab8f23)

Documentation

• Reference
• API
• Changelog

We invite you to try the mongodb library immediately, and report any issues to the NODE project.

v6.4.0

6.4.0 (2024-02-29)

The MongoDB Node.js team is pleased to announce version 6.4.0 of the mongodb package!

Release Notes

Server selection will use a different Mongos on retry

When retrying reads or writes on a sharded cluster, the driver will attempt to select a different mongos for the retry if multiple are present. This should heuristically avoid encountering the original error that caused the need to retry the operation.

Caching AWS credentials provider per client

Instead of creating a new AWS provider for each authentication, we cache the AWS credentials provider per client to prevent overwhelming the auth endpoint and ensure that cached credentials are not shared with other clients.

BSON upgraded to ^6.4.0

BSON has had a number of performance increases in the last two releases (6.3.0 and 6.4.0). Small basic latin (ASCII) only strings, small memory allocations (ObjectId and Decimal128) and numeric parsing operations (int32, doubles, and longs) have all had optimizations applied to them.

For details check out the release notes here: BSON 6.3.0 and BSON 6.4.0 🐎

ExceededTimeLimit was made a retryable reads error

Read operations will be retried after receiving an error with the ExceededTimeLimit label.

Fixed unresolved request issue in KMS requester

Internal to the field-level encryption machinery is a helper that opens a TLS socket to the KMS provider endpoint and submits a KMS request. The code neglected to add a 'close' event listener to the socket, which had the potential to improperly leave the promise pending indefinitely if no error was encountered.

The base64 padding is now preserved in the saslContinue command

The authentication was rejected by the saslContinue command from mongosh due to missing "=" padding from the client. We fixed the way we parse payload to preserve trailing "="s.

countDocuments now types the filter using the collection Schema

Previously, countDocuments had a weakly typed Document type for the filter allowing any JS object as input. The filter is now typed as Filter<Schema> to enable autocompletion, and, hopefully, catch minor bugs.

Thank you to @pashok88895 for contributing to this improvement.

The type error with $addToSet in bulkWrite was fixed

Previously the following code sample would show a type error:

interface IndexSingatureTestDocument extends Document {
    readonly myId: number;
    readonly mySet: number[];
  }
const indexSingatureCollection = undefined as unknown as Collection<IndexSingatureTestDocument>;
indexSingatureCollection.bulkWrite([
  {
    updateOne: {
      filter: { myId: 0 },
      update: {
        $addToSet: { mySet: 0 } // The type error! Type 'number' is not assignable to type 'never'.
      }
    }
  }
]);

It happened because the driver's Document type falls back to any, and internally we could not distinguish whether or not this assignment was intentional and should be allowed.

After this change, users can extend their types from Document/any, or use properties of any type and we skip the $addToSet validation in those cases.

Fixed heartbeat duration including socket creation

The ServerHeartbeatSucceeded and ServerHeartbeatFailed event have a duration property that represents the time it took to perform the hello handshake with MongoDB. The Monitor responsible for issuing heartbeats mistakenly included the time it took to create the socket in this field, which inflates the value with the time it takes to perform a DNS lookup, TCP, and TLS handshakes.

Errors on cursor transform streams are now properly propagated.

These were previously swallowed and now will be emitted on the error event:

const transform = new Transform({
  transform(data, encoding, callback) {
    callback(null, data);
  },
});
const stream = db.collection('tests').find().sort({ studentId: -1 }).stream({ transform });
stream.on('error', err => {
  // The error will properly be emitted here.
});

The AWS token is now optional

Users may provide an AWS_SESSION_TOKEN as a client option or AWS configuration in addition to a username and password. But if the token is not provided, the driver won't throw an exception and let AWS SDK handle the request.

Features

• NODE-3449: Add serverConnectionId to Command Monitoring Spec (735f7aa)
• NODE-3470: retry selects another mongos (#3963) (84959ee)
• NODE-3689: require hello command for connection handshake to use OP_MSG disallowing OP_QUERY (#3938) (ce7df0f)
• NODE-5717: make ExceededTimeLimit retryable reads error (#3947) (106ab09)
• NODE-5939: Implement 6.x: cache the AWS credentials provider in the MONGODB-AWS auth logic (#3991) (e0a37e5)
• NODE-5978: upgrade BSON to ^6.4.0 (#4007) (90f2f70)
  • NODE-5885: upgrade BSON to ^6.3.0 (#3983) (9401d09)

Bug Fixes

• NODE-5127: implement reject kmsRequest on server close (#3964) (568e05f)
• NODE-5609: node driver omits base64 padding in sasl-continue command (#3975) (b7d28d3)
• NODE-5765: change type for countDocuments (#3932) (22cae0f)
• NODE-5791: type error with $addToSet in bulkWrite (#3953) (b93d405)
• NODE-5840: heartbeat duration includes socket creation (#3973) (a42039b)
• NODE-5901: propagate errors to transformed stream in cursor (#3985) (ecfc615)
• NODE-5944: make AWS session token optional (#4002) (f26de76)

Performance Improvements

• NODE-5771: improve new connection (#3948) (a4776cf)
• NODE-5928: consolidate signal use and abort promise wrap (#3992) (38742c2)

Documentation

• Reference
• API
• Changelog

We invite you to try the mongodb library immediately, and report any issues to the NODE project.