LIVE DEMONSTRATION · SIMULATED API
Invalid input does not become a false success.
I executed this workflow in a local n8n instance on 11 September 2026. Valid input creates a fictional contact; three invalid inputs are rejected without an API call; a simulated API failure returns HTTP 503.
Webhook → validation → API → response
Real execution, fictional data. No client system connected.
| Case | HTTP | API calls | Result |
|---|---|---|---|
| Valid data, normalized name | 201 | 1 | As expected |
| Empty name rejected | 400 | 0 | As expected |
| Unknown status rejected | 400 | 0 | As expected |
| Missing name rejected | 400 | 0 | As expected |
| API failure reported | 503 | 1 | As expected |
Two API calls in total. One fictional contact created.
Inspect and reproduce
Recorded HTTP results (JSON) · Inactive n8n workflow (JSON) · Simulated API server and five tests
In a test instance of n8n 2.38.7, import the workflow and activate it on local port 18765. The Node test script starts the simulated API on 127.0.0.1:18766 and calls the local webhook. Run node test.mjs with Node 24. Stop the instance after testing. Both ports must be free.
What this proof does not establish
No real CRM connection, client authentication, idempotency or production availability is demonstrated. Do not expose this webhook without authentication. The five n8n executions reached their response branch; that does not mean five successful creations.
Recorded results from 11 September 2026. This translation, published on 22 September, is not a new execution. n8n and its dependencies retain their respective licenses.Have one failing workflow?
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