How can I configure n8n Code nodes to properly handle a WooCommerce product array?

Below is some guidance on how to fix the issues you’re seeing:

Data Structure in n8n

n8n always expects data to be an array of items, where each item is an object with a key named json. If you return a single object (or forget the array wrapper), then downstream nodes may not see the data as expected. For example, your code should return data like this:

JAVASCRIPTCopied
return [
  {
    json: {
      // your payload here
    }
  }
];

When Passing an Array of Products

If WooCommerce is sending an array of 3 products and n8n is treating that as 1 item, you have two main options:

1. Process Each Product Separately
   Use the Split Out node or change the mode of your Code node to “Run Once Per Item” so that each product in the array gets processed individually. This way, every Code node connected afterward receives one product per item.

2. Handle the Array as a Child Array
   When you want to process all three products in one Code node (for example, to pass the entire array as a child property like your ERP system requires), make sure your Code node returns a properly structured output. In your case, you need to wrap the output in an array so that the ERP system receives the data in the expected format.

Adjusting Your Code

Based on your snippet, here’s how you can adjust your code if you want to return a single object (with the entire products array) that meets n8n’s data structure:

JAVASCRIPTCopied
const erpItems = order.line_items.map(line => {
	return {
		item_code: line.cd,
		qty: line.qty,
	};
});

// Wrap your object in an array so that it becomes an item that n8n can pass along:
return [
	{
		json: {
			customer: order.name,
			order_type: 'Sales',
			// The child table:
			fooditems: erpItems
		}
	}
];

Summary of Solutions

• To Pass Each Product Individually:
  Either use a Split Out node after the initial Code node or change the Code node’s mode to “Run Once Per Item” so each product in your array is treated as a separate item.

• To Pass the Entire Array as a Child Property:
  Ensure that your Code node returns an array containing one object (with the json key). This lets subsequent nodes (like your ERP integration) receive the expected structure (an object with an embedded array).

Using one of these approaches should resolve the issue where only your first Code node is seeing the product data correctly. Make sure that every node in your workflow receives data in the standard n8n structure: an array of objects where each object has a json property.