n8n workflows · Tutorials · Troubleshooting
Practical n8n Workflows for Solo Operators
Build useful n8n workflows and understand what happens when they fail. Start with lab-tested expressions, data cleanup and human approvals, then explore rate limits and error workflows.
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- Practical n8n workflows
- Step-by-step guides
- Clear test notes
What is going wrong in your n8n workflow?
Pick the closest match. You get the guide I wrote after testing it, plus a free workflow to download where there is one.
- Webhook returns 404, 422 or 500: Test URL versus production URL, and what each error means. Read the webhook guide
- A file goes missing between nodes: Field names, Code nodes and uploads that lose the file. Read the binary data guide · Download the free lab
- Loop Over Items skips or repeats items: Batch sizes, the Loop and Done outputs and wrong first items. Read the Loop Over Items guide · Download the free lab
- A sub-workflow returns old or empty data: What the parent receives when the child returns nothing or something different. Read the sub-workflow guide · Download the free lab
- HTTP 429 rate limits: How to read Retry-After and wait before retrying. Read the rate limit guide · Download the free lab
- Duplicate records from repeated webhooks: Spot repeat events and stop them creating duplicate rows. Read the duplicate prevention guide · Download the free lab
- An expression returns the wrong value: 50 tested expressions with sample data and results. Read the expressions guide · Download the free lab
- Messy XML or CSV data: Check arrays, single items and leading zeros in converted data. Read the XML to JSON guide · Download the free lab
- An approval step or its timeout: Approve, reject and timeout paths for Wait and Slack approvals. Read the approval guide
- I want failures to alert me: An error workflow that catches failures from other workflows. Read the error workflow guide · Download the free lab
- Something else: Send the failing workflow and get written fix steps by email, from $29. No calls. Fix my workflow
Written and tested by Sajjad Hasan
Fix an error
What I have tested
50 expression cases passed · 8 XML cases passed · 19 CSV parser tests passed · Form and Slack approval, rejection and timeout tests
Bounded lab tests, not production benchmarks.
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Tools used with n8n
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n8n Lead Import Prep Pack — $9
Three editable n8n workflows to clean a lead batch, review corrections and plan safe retries before it reaches your CRM.