This n8n workflow demonstrates effective data deduplication using JavaScript code nodes. It starts with creating sample user data containing duplicate email addresses, then applies a custom JavaScript function to filter out duplicates, and finally displays the cleaned data along with deduplication statistics. This process is useful for maintaining clean, reliable data before importing into CRMs, databases, or other systems. The workflow provides step-by-step code snippets and explains key concepts like filtering, findIndex, and JSON handling, making it a practical guide for automating data cleanup tasks in n8n.