How can I combine multiple initialized variables into one output array in n8n?

Below is one approach to solve your problem by creating one single output item that holds an array of all your variables. The key is that when you have multiple items coming into a node (11 in your case), simply toggling “Execute Once” on a Set node isn’t enough because that node still processes each individual item. Instead, you can use a Function (or Code) node configured to run once for all incoming items.

Here’s how you can do it:

1. Add a Function node after your variable initialization.
2. Set the Function node to “Run Once for All Items” (this option is available in the node’s settings).
3. In the Function node, you can access all incoming items with the expression $input.all() and then build a single output item combining your variables into an array.

For example, the code below collects all items into one array using the property “value” (replace “value” with your specific property name as needed):

JSCopied
// Access all incoming items (each item comes in as an object under .json)
const items = $input.all();

// Map through the items and extract the variables you need.
// Adjust the code below if you have more properties to gather.
const combinedArray = items.map(item => item.json.value);

// Return a single item with the combined array
return [
	{
		json: {
			combinedArray
		}
	}
];

This way, even though you have 11 separate items coming in (one per variable), the Function node processes them all together and outputs one single item containing your array.

Using this solution, you won’t end up with 11 items in the output node.

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Give this a try and adjust the code as necessary for your specific use case.