{"record":{"id":"836dba9135c3de66","repo":"n8n-io/n8n","slug":"mongodb-connection-error-error-message","errorCode":null,"errorMessage":"MongoDB connection error: ${error.message}","messagePattern":"MongoDB connection error: (.+?)","errorType":"exception","errorClass":"NodeOperationError","httpStatus":null,"severity":"error","filePath":"packages/@n8n/nodes-langchain/nodes/memory/MemoryMongoDbChat/MemoryMongoDbChat.node.ts","lineNumber":168,"sourceCode":"\t\t\t\tmemoryKey: 'chat_history',\n\t\t\t\tchatHistory: mongoDBChatHistory,\n\t\t\t\treturnMessages: true,\n\t\t\t\tinputKey: 'input',\n\t\t\t\toutputKey: 'output',\n\t\t\t\tk: this.getNodeParameter('contextWindowLength', itemIndex, 5) as number,\n\t\t\t});\n\n\t\t\tasync function closeFunction() {\n\t\t\t\tawait client.close();\n\t\t\t}\n\n\t\t\treturn {\n\t\t\t\tcloseFunction,\n\t\t\t\tresponse: logWrapper(memory, this),\n\t\t\t};\n\t\t} catch (error) {\n\t\t\tvoid client.close();\n\t\t\tthrow new NodeOperationError(this.getNode(), `MongoDB connection error: ${error.message}`);\n\t\t}\n\t}\n}\n","sourceCodeStart":150,"sourceCodeEnd":172,"githubUrl":"https://github.com/n8n-io/n8n/blob/5ac6606e81f67bb9534255570cd4e86fd8101eee/packages/@n8n/nodes-langchain/nodes/memory/MemoryMongoDbChat/MemoryMongoDbChat.node.ts#L150-L172","documentation":"Error \"MongoDB connection error: ${error.message}\" thrown in n8n-io/n8n.","triggerScenarios":"Thrown at packages/@n8n/nodes-langchain/nodes/memory/MemoryMongoDbChat/MemoryMongoDbChat.node.ts:168 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":[],"exampleFix":null,"handlingStrategy":null,"validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"5ac6606e81f67bb9534255570cd4e86fd8101eee","analyzedAt":"2026-08-12T05:26:35.080Z","schemaVersion":2},"datasetVersion":"2026-08-12T13:17:24.610Z"}