Interactive n8n Code Node (JS) Hands-On Tutorial

This workflow serves as an interactive tutorial for mastering n8n's Code node with JavaScript. It starts with sample user data, then demonstrates processing each item individually to compute full names and ages using $input.item.json. Next, it advances to fetching external data via this.helpers.httpRequest to an API like genderize.io for gender prediction, enriching each record progressively.

The tutorial then shows batch processing with $items() to calculate summary statistics like average age across all items in a single execution. Finally, it creates a binary CSV file from the enriched dataset using Buffer, highlighting binary data handling. Benefits include rapid learning of core Code node concepts, from basics to advanced features, without external setup—ideal for n8n beginners and intermediates.

Use cases span data transformation pipelines, API enrichment, reporting summaries, and file exports in automation workflows. Experiment by modifying sample data or code to build custom logic, accelerating development in areas like user profiling, analytics, or ETL processes. No setup required; just execute and inspect node outputs for instant feedback.