Remove Email Duplicates in n8n with JavaScript

# Remove email duplicates in n8n using JavaScript before CRM import

This automation template helps clean user data by removing duplicate entries based on email addresses — a critical step before importing into CRM or databases. It leverages n8n´s built-in capabilities and JavaScript code nodes to efficiently deduplicate records, ensuring high-quality data without manual intervention.

## Who it´s for
- Developers learning data processing in n8n
- Analysts who need to clean data before export
- System administrators preventing record duplication in CRM

## What the automation does
- Generates a sample array of user entries with repeated emails
- Uses n8n Code nodes to run JavaScript deduplication logic
- Applies filter() and findIndex() methods to identify unique records
- Outputs clean, structured JSON data
- Triggered manually — ideal for testing and demonstration

## What´s included
- Ready-to-use n8n workflow
- Trigger and handler logic
- Integrations only with stack services: n8n, JavaScript, JSON
- Basic text instructions for launch and adaptation

## Requirements for setup
- n8n account (self-hosted or cloud)
- Basic understanding of JavaScript and JSON
- Access to workflow editor interface

## Benefits and outcomes
- Prevents CRM pollution with duplicates
- Saves time on manual data cleaning
- Serves as a training example for teams
- Ensures reproducible data-cleaning process
- Can be embedded as a module in larger workflows

## Important: template only
Important: you are purchasing a ready-made automation workflow template only. Rollout into your infrastructure, connecting specific accounts and services, 1:1 setup help, custom adjustments for non-standard stacks and any consulting support are provided as a separate paid service at an individual rate. To discuss custom work or 1:1 help, contact via chat