Hi @ckrkptrck
This is part of using the code node in n8n because it sort of “interrupts” the programmatic data flow of a workflow. In order to keep the data flow linked and for future nodes reference-able you need to link the items via the pairedItem property.
Like so:
return items[0].json.data.map((item, index) => {
return { json: item, pairedItem: index };
});
If you do not link them you could potentially run into a mapping issue further down the workflow when referencing a node before the code node
Note, this only applies to using the item variable. If you’re working with $input instead, the item linking will be done by n8n under the hood.