FlowiseAI/Flowise · error · Error

${e}

Error message

${e}

What it means

A generic catch-all in the MongoDB Atlas vector store node's `addDocuments` path: any exception thrown while constructing `MongoDBAtlasVectorSearch` or calling `addDocuments` is re-wrapped via `throw new Error(e)`. Because `new Error(e)` coerces a non-string to its string form, an original `Error` loses its stack trace and name, and the message becomes the original error's `.toString()` (e.g. `Error: connection timeout`).

Source

Thrown at packages/components/nodes/vectorstores/MongoDBAtlas/MongoDBAtlas.ts:159

                    finalDocs.push(document)
                }
            }

            try {
                if (!textKey || textKey === '') textKey = 'text'
                if (!embeddingKey || embeddingKey === '') embeddingKey = 'embedding'

                const mongoDBAtlasVectorSearch = new MongoDBAtlasVectorSearch(embeddings, {
                    connectionDetails: { mongoDBConnectUrl, databaseName, collectionName },
                    indexName,
                    textKey,
                    embeddingKey
                })
                await mongoDBAtlasVectorSearch.addDocuments(finalDocs)

                return { numAdded: finalDocs.length, addedDocs: finalDocs }
            } catch (e) {
                throw new Error(e)
            }
        }
    }

    async init(nodeData: INodeData, _: string, options: ICommonObject): Promise<any> {
        const credentialData = await getCredentialData(nodeData.credential ?? '', options)
        const databaseName = nodeData.inputs?.databaseName as string
        const collectionName = nodeData.inputs?.collectionName as string
        const indexName = nodeData.inputs?.indexName as string
        let textKey = nodeData.inputs?.textKey as string
        let embeddingKey = nodeData.inputs?.embeddingKey as string
        const embeddings = nodeData.inputs?.embeddings as Embeddings
        const mongoMetadataFilter = nodeData.inputs?.mongoMetadataFilter as object

        let mongoDBConnectUrl = getCredentialParam('mongoDBConnectUrl', credentialData, nodeData)

        const mongoDbFilter: MongoDBAtlasVectorSearch['FilterType'] = {}

View on GitHub (pinned to abe4a8601a)

Solutions

1. Read the wrapped message to get the MongoDB driver's underlying reason (auth, timeout, index).
2. Verify the Atlas cluster's network access includes the current host IP.
3. Confirm the vector search index exists and its `dimensions` match the embedding model output.
4. Re-wrap with `Error`-preserving code (see fix) so future failures retain their stack.
5. Rotate/re-check the `mongoDBConnectUrl` credential if auth is the cause.

Example fix

// before
} catch (e) {
    throw new Error(e)
}
// after — preserve the original error chain
} catch (e) {
    throw e instanceof Error ? e : new Error(String(e))
}

// preflight: validate connection + index readiness
const client = new MongoClient(mongoDBConnectUrl)
await client.connect()
const coll = client.db(databaseName).collection(collectionName)
const indexes = await coll.listSearchIndexes({ name: indexName }).toArray()
if (!indexes.length || indexes[0].status !== 'READY') {
  throw new Error(`Atlas search index '${indexName}' not ready`)
}

function isMongoError(e: unknown): e is { code: string; message: string } {
  return typeof e === 'object' && e !== null && 'code' in e && 'message' in e
}

try {
  await mongoDBAtlasVectorSearch.addDocuments(finalDocs)
} catch (e) {
  // preserve original error
  throw e instanceof Error ? e : new Error(String(e))
}

When it happens

Trigger: MongoDB connection failure (bad URI, network blocked, IP not allow-listed on Atlas); the search index does not exist or is not ready; `addDocuments` violates a schema validation rule; embedding dimension does not match the vector field definition in the Atlas search index.

Common situations: Atlas cluster IP allow-list does not include the host; `mongoDBConnectUrl` credential stale or rotated; vector search index still building; embedding model changed without recreating the index definition.

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AI-assisted analysis of FlowiseAI/Flowise@abe4a8601a (2026-08-12). Data as JSON: /api/errors/c0b988328026fc37. Report an issue: GitHub.