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packages/@n8n/nodes-langchain/nodes/memory/MemoryMongoDbChat/MemoryMongoDbChat.node.ts

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+import { MongoDBChatMessageHistory } from '@langchain/mongodb';
+import { BufferWindowMemory } from '@langchain/classic/memory';
+import { MongoClient } from 'mongodb';
+import type {
+	ISupplyDataFunctions,
+	INodeType,
+	INodeTypeDescription,
+	SupplyData,
+} from 'n8n-workflow';
+import { NodeConnectionTypes, NodeOperationError } from 'n8n-workflow';
+
+import { getSessionId } from '@utils/helpers';
+import { logWrapper, getConnectionHintNoticeField } from '@n8n/ai-utilities';
+
+import {
+	sessionIdOption,
+	sessionKeyProperty,
+	expressionSessionKeyProperty,
+	contextWindowLengthProperty,
+} from '../descriptions';
+
+export class MemoryMongoDbChat implements INodeType {
+	description: INodeTypeDescription = {
+		displayName: 'MongoDB Chat Memory',
+		name: 'memoryMongoDbChat',
+		icon: 'file:mongodb.svg',
+		group: ['transform'],
+		version: [1],
+		description: 'Stores the chat history in MongoDB collection.',
+		defaults: {
+			name: 'MongoDB Chat Memory',
+		},
+		credentials: [
+			{
+				name: 'mongoDb',
+				required: true,
+			},
+		],
+		codex: {
+			categories: ['AI'],
+			subcategories: {
+				AI: ['Memory'],
+				Memory: ['Other memories'],
+			},
+			resources: {
+				primaryDocumentation: [
+					{
+						url: 'https://docs.n8n.io/integrations/builtin/cluster-nodes/sub-nodes/n8n-nodes-langchain.memorymongochat/',
+					},
+				],
+			},
+		},
+		inputs: [],
+		outputs: [NodeConnectionTypes.AiMemory],
+		outputNames: ['Memory'],
+		properties: [
+			getConnectionHintNoticeField([NodeConnectionTypes.AiAgent]),
+			sessionIdOption,
+			expressionSessionKeyProperty(1),
+			sessionKeyProperty,
+			{
+				displayName: 'Collection Name',
+				name: 'collectionName',
+				type: 'string',
+				default: 'n8n_chat_histories',
+				description:
+					'The collection name to store the chat history in. If collection does not exist, it will be created.',
+			},
+			{
+				displayName: 'Database Name',
+				name: 'databaseName',
+				type: 'string',
+				default: '',
+				description:
+					'The database name to store the chat history in. If not provided, the database from credentials will be used.',
+			},
+			contextWindowLengthProperty,
+		],
+	};
+
+	async supplyData(this: ISupplyDataFunctions, itemIndex: number): Promise<SupplyData> {
+		const credentials = await this.getCredentials<{
+			configurationType: string;
+			connectionString: string;
+			database: string;
+			host: string;
+			user: string;
+			port: number;
+			password: string;
+			tls: boolean;
+		}>('mongoDb');
+		const collectionName = this.getNodeParameter(
+			'collectionName',
+			itemIndex,
+			'n8n_chat_histories',
+		) as string;
+		const databaseName = this.getNodeParameter('databaseName', itemIndex, '') as string;
+		const sessionId = getSessionId(this, itemIndex);
+
+		let connectionString: string;
+		let dbName: string;
+
+		if (credentials.configurationType === 'connectionString') {
+			connectionString = credentials.connectionString;
+			dbName = databaseName || credentials.database;
+		} else {
+			// Build connection string from individual fields
+			const host = credentials.host;
+			const port = credentials.port;
+			const user = credentials.user ? encodeURIComponent(credentials.user) : '';
+			const password = credentials.password ? encodeURIComponent(credentials.password) : '';
+			const authString = user && password ? `${user}:${password}@` : '';
+			const tls = credentials.tls;
+
+			connectionString = `mongodb://${authString}${host}:${port}/?appname=n8n`;
+			if (tls) {
+				connectionString += '&ssl=true';
+			}
+
+			dbName = databaseName || credentials.database;
+		}
+
+		if (!dbName) {
+			throw new NodeOperationError(
+				this.getNode(),
+				'Database name must be provided either in credentials or in node parameters',
+			);
+		}
+
+		try {
+			const client = new MongoClient(connectionString);
+			await client.connect();
+
+			const db = client.db(dbName);
+			const collection = db.collection(collectionName);
+
+			const mongoDBChatHistory = new MongoDBChatMessageHistory({
+				collection,
+				sessionId,
+			});
+
+			const memory = new BufferWindowMemory({
+				memoryKey: 'chat_history',
+				chatHistory: mongoDBChatHistory,
+				returnMessages: true,
+				inputKey: 'input',
+				outputKey: 'output',
+				k: this.getNodeParameter('contextWindowLength', itemIndex, 5) as number,
+			});
+
+			async function closeFunction() {
+				await client.close();
+			}
+
+			return {
+				closeFunction,
+				response: logWrapper(memory, this),
+			};
+		} catch (error) {
+			throw new NodeOperationError(this.getNode(), `MongoDB connection error: ${error.message}`);
+		}
+	}
+}

packages/@n8n/nodes-langchain/nodes/memory/MemoryMongoDbChat/mongodb.dark.svg

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+</svg>

packages/@n8n/nodes-langchain/nodes/memory/MemoryMongoDbChat/mongodb.svg

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+<svg width="120" height="258" viewBox="0 0 120 258" fill="none" xmlns="http://www.w3.org/2000/svg">
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+</svg>