n8n Node Guide: Aggregate

Description

Data Transformation node in n8n.

What It Does

Group items into one item per group.

When To Use It

Summaries, rollups, building arrays for batch calls.

Key Parameters

Aggregation (All Incoming Items, Group By), fields to aggregate

Common Mistakes

Output shape changes – one item per group, with arrays inside. Downstream nodes must handle it.

Example

Aggregate by customerId -> one item per customer with their order array.

FAQ

Is this node included in n8n Community Edition?

Yes – Aggregate ships with the free Community Edition. No paid license needed.

Use “Group By” with multiple fields for composite keys.?

Where does it fit in a workflow?

Aggregate works with any other node – connect it after a trigger or data node, and feed its output into the next step. Standard n8n data flow: trigger -> transform -> act.

Is support included?

Yes – message the seller through the store and I will help you wire this node.