Count Items Returned by Any Node

This workflow demonstrates an efficient way to count the number of items produced by a preceding node in n8n. It starts with a Manual Trigger, fetches sample data from the Customer Datastore node (which returns multiple people records), and then uses a Set node configured with 'Execute Once' to compute the total count via the expression {{ $input.all().length }}. The result is a single item containing the 'itemCount' value, making it ideal for debugging or logging purposes without altering data flow.

The key benefit is simplicity and reusability: no custom code nodes or complex expressions needed. By leveraging n8n's built-in $input.all() method, you get all incoming items at once and use JavaScript's .length property for instant counting. This keeps workflows lightweight and performant, especially useful after nodes like HTTP Request, database queries, or splits that generate variable item counts.

Use cases include monitoring API responses, validating data imports, aggregating batch sizes in ETL processes, or integrating into larger automations for conditional logic (e.g., 'if count > 10, notify'). It's perfect for developers troubleshooting workflows or building dynamic routers based on item volume. Easily adapt by inserting after any node—no modifications required.