MongoDB as Chat Memory Provider (#3001)

Co-authored-by: Justin Ellingwood <[email protected]>

Author: Pash10g

Diff for: docs/integrations/builtin/cluster-nodes/sub-nodes/n8n-nodes-langchain.memorymongochat.md

@@ -0,0 +1,37 @@
+---
+#https://www.notion.so/n8n/Frontmatter-432c2b8dff1f43d4b1c8d20075510fe4
+title: MongoDB Chat Memory node documentation
+description: Learn how to use the MongoDB Chat Memory node in n8n. Follow technical documentation to integrate MongoDB Chat Memory node into your workflows.
+contentType: [integration, reference]
+---
+
+# MongoDB Chat Memory node
+
+Use the MongoDB Chat Memory node to use MongoDB as a [memory](/glossary.md#ai-memory) server for storing chat history.
+
+On this page, you'll find a list of operations the MongoDB Chat Memory node supports, and links to more resources.
+
+/// note | Credentials
+You can find authentication information for this node [here](/integrations/builtin/credentials/mongodb.md).
+///
+
+--8<-- "_snippets/integrations/builtin/cluster-nodes/sub-node-expression-resolution.md"
+
+## Node parameters
+
+* **Session Key**: Enter the key to use to store the memory in the workflow data.
+* **Collection Name**: Enter the name of the collection to store the chat history in. The system will create the collection if it doesn't exist.
+* **Database Name**: Enter the name of the database to store the chat history in. If not provided, the database from credentials will be used.
+* **Context Window Length**: Enter the number of previous interactions to consider for context.
+
+## Related resources
+
+Refer to [LangChain's MongoDB Chat Message History documentation](https://js.langchain.com/docs/integrations/memory/mongodb){:target=_blank .external-link} for more information about the service.
+
+--8<-- "_snippets/integrations/builtin/cluster-nodes/langchain-overview-link.md"
+
+## Single memory instance
+
+[[% include "_includes/integrations/cluster-nodes/memory-shared.html" %]]
+
+--8<-- "_glossary/ai-glossary.md"

Diff for: docs/integrations/builtin/credentials/mongodb.md

@@ -12,6 +12,7 @@ You can use these credentials to authenticate the following nodes:
 
 - [MongoDB](/integrations/builtin/app-nodes/n8n-nodes-base.mongodb.md)
 - [MongoDB Atlas Vector Store](/integrations/builtin/cluster-nodes/root-nodes/n8n-nodes-langchain.vectorstoremongodbatlas.md)
+- [MongoDB Chat Memory](/integrations/builtin/cluster-nodes/sub-nodes/n8n-nodes-langchain.memorymongochat.md)
 
 ## Prerequisites
 

Diff for: nav.yml

@@ -734,6 +734,7 @@ nav:
             - integrations/builtin/cluster-nodes/sub-nodes/n8n-nodes-langchain.memorybufferwindow/index.md
             - Common issues: integrations/builtin/cluster-nodes/sub-nodes/n8n-nodes-langchain.memorybufferwindow/common-issues.md
           - Motorhead: integrations/builtin/cluster-nodes/sub-nodes/n8n-nodes-langchain.memorymotorhead.md
+          - MongoDB Chat Memory: integrations/builtin/cluster-nodes/sub-nodes/n8n-nodes-langchain.memorymongochat.md
           - Redis Chat Memory: integrations/builtin/cluster-nodes/sub-nodes/n8n-nodes-langchain.memoryredischat.md
           - Postgres Chat Memory: integrations/builtin/cluster-nodes/sub-nodes/n8n-nodes-langchain.memorypostgreschat.md
           - Xata: integrations/builtin/cluster-nodes/sub-nodes/n8n-nodes-langchain.memoryxata.md