n8n Loop Control: Prevent Infinite Loops with $runIndex

This n8n workflow showcases a clever technique to implement controlled loops using the built-in $runIndex expression. Starting with a Manual Trigger, it enters a loop where a Twitter node posts 'Hello from n8n!', then feeds into an IF node that checks if $runIndex is less than 5 (configured as value1={{$runIndex}} compared to 4). If true, it loops back to Twitter; if false, it exits to a NoOp node, ensuring exactly 5 iterations.

The primary benefit is preventing infinite loops, a common pitfall in workflow automation. By leveraging $runIndex—which increments per execution in looped paths—developers can add simple, expression-based termination conditions without external counters or complex state management. This keeps workflows lightweight and efficient.

Ideal use cases include batch processing like posting multiple social media updates, sending a fixed number of emails or API calls, data scraping in controlled batches, or testing repetitive actions. Easily adapt by swapping Twitter for any node (e.g., Email, HTTP Request) and adjusting the IF threshold. With over 10,000 views, it's a proven educational gem for n8n users tackling iterative automations.