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Docker Redis Setup for n8n: Step-by-Step Guide

February 6, 2026
n8n Redis errors

Integrate MongoDB With n8n in 5 Simple Steps

February 6, 2026
n8n MongoDB errors

Fix 4 MongoDB Version Compatibility Issues in n8n

January 25, 2026
n8n MongoDB errors

n8n MongoDB Incorrect Data Type Error? Fix Data: Step-by-…

February 6, 2026
n8n MongoDB errors

n8n MongoDB connection pool exhausted – fix for concurrent workflow load

March 28, 2026
n8n MongoDB errors

How to Fix the Unsupported Operator Error in n8n MongoDB

February 6, 2026
n8n MongoDB errors

n8n MongoDB Document Not Found Error: Diagnose & Fix

January 16, 2026
n8n MongoDB errors

n8n MongoDB duplicate key error – E11000 fix for upsert workflows

March 28, 2026
n8n MongoDB errors
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Categories

  • Docker Debugging (3)
  • n8n API Integration Errors (17)
  • n8n Architectural & Decision-Making (16)
  • n8n Architectural Failure Modes (13)
  • n8n Architecture & Execution Foundations (19)
  • n8n Authentication Errors (16)
  • n8n Automations (2)
  • n8n Cost & Infrastructure Economics (15)
  • n8n Degradation & Stability Issues (12)
  • n8n Installation & Setup Errors (16)
  • n8n MongoDB errors (12)
  • n8n Node-Specific Errors (25)
  • n8n Performance & Scaling (26)
  • n8n PostgreSQL Errors (4)
  • n8n Production Failure Patterns (11)
  • n8n Production Readiness & Scalability Risks (12)
  • n8n Queue Mode Errors (26)
  • n8n Redis errors (15)
  • n8n Security Errors (12)
  • n8n SQLite errors (13)
  • n8n vs Zapier (5)
  • n8n Webhook Errors (17)
  • Uncategorized (1)

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Table of Contents

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  • 1. Understanding the Duplicate Key Error in n8n
  • 2. Common Scenarios That Trigger the Error
  • 3. Step‑by‑Step Fixes
    • 3.1. Pre‑Check with a “Find” Node (Idempotent Pattern)
    • 3.2. Upsert‑Only Approach (Single Node Solution)
    • 3.3. Handling Bulk Inserts Safely
  • 4. Real‑World Example Workflow (JSON Export)
  • 5. Checklist – Prevent Duplicate Key Errors
  • 6. EEFA (Expert, Experience, Fact, Authority) Insights
    • Next Steps

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