node-red-contrib-mongodb4

A MongoDB client node for Node-Red powered by MongoDB Driver V4

This package includes two nodes for node-red:

• A configuration node which defines a connection to a MongoDB database server.
• A flow node to execute every MongoDB collection operation supported by MongoDB Driver 4.

This node was inspired by other projects like node-red-contrib-mongodb3 or node-red-node-mongodb.

Compatibility

This MongoDB Node is compatible with the following MongoDB Server versions: 6.0, 5.0, 4.4, 4.2, 4.0, 3.6

You will also need a node-red version with NodeJS v12 or v14.

Installation

Navigate to your .node-red directory - typically ~/.node-red.

  npm install node-red-contrib-mongodb4

Usage Example

Import the example flow to get a quick introduction how to use this node.
flow.json

The Configuration Node

Configuration node for MongoDB connection config. This node will create a MongoDB client, with a connection pool for operation nodes.

Simple Connection URI

: Protocol (string) : mongodb or mongodb+srv

: Hostname (string) : Hostname / IP to connect to MongoDB

: Port (number) : Optional port number. In most cases 27017.

Advanced Connection URI

: URI (string) : This will overwrite Protocol, Hostname and Port with your own connection string. Read the docs: Connection String in URI Format

Authentication

: Username (string) : Username for authentication.

: Password (string) : Password for authentication.

: AuthSource (string) : Specify the database name associated with the user’s credentials.

: AuthMech (string) : Specify the authentication mechanism that MongoDB will use to authenticate the connection.

TLS (optional)

: TLS CA File (path) : 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.

: TLS Certificate Key File (path) : 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.

: TLS Certificate Key Filepassword (string) : Specifies the password to de-crypt the TLS certificate.

: TLS-Insecure (bool) : Disables various certificate validations. THIS IS REALLY NOT SECURE.

More Options

: Options (JSON) : MongoDB Driver 4 MongoClient supports more options. Feel free to overwrite all client options with your own. Read the docs: MongoClientOptions

Database

: Database (string) : A MongoDB database name is required.

Connection Pools

Each configuration node has his own connection pool with a default max poolsize of 100 connection at a given time. More parallel connections / operations will be queued and processed synchronous. In this scenario slow operations will delay fast operations. You can create more separat connection pools with more configuration nodes. More Information

The Operation Node

Execute MongoDB collection operations with this node.

Connection

Select a MongoDB database server connection.

Collection

MongoDB database collection static definition or with msg.collection

Operation

A MongoDB Driver 4 collection CRUD operation for example find, insertOne, updateOne, aggregate and many more.

Read the full documentation here: Collection-API

Payload Input

Pass the CRUD operation arguments as message payload. Message payload has to be array type to pass multiple function arguments to driver operation. Example: msg.payload = [{name: 'marina'},{fields: {...}}]. The payload array will be passed as function arguments for the MongoDB driver collection operation, like so: collection.find({name: 'marina'}, {fields: {...}})

More information here: Collection-API

How to query by document _id

The default MongoDB document identifier has to be of type ObjectId. This means the native driver expects query arguments like: msg.payload = [{_id: ObjectId("624b527d08e23628e99eb963")}] No panic the operation node will handle this for you. You can pass a document id as string type. If this string is a valid ObjectId, it will be translated into a real ObjectId before executed by the native driver. So this will work: msg.payload = [{_id: "624b527d08e23628e99eb963"}] or this will also work: msg.payload = [{_id: {$in: ["624b527d08e23628e99eb963"]}}]

Payload Output

The node will output the database driver response as message payload. The operations aggregate and find can output with toArray or forEach.

More information

Visit the MongoDB Driver 4 Docs