Malformed structure
Missing fields and invalid JSON stop at the boundary.
n8n AI output validator
Test structured output against required fields, action and target allowlists, and a confidence threshold. Invalid or uncertain output routes to human_review.
Live browser demo
Everything runs in this browser tab. The demo does not upload, store, or execute your candidate output.
{
"accepted": true,
"route": "continue",
"issues": [],
"normalized_output": {
"action": "route_lead",
"confidence": 0.92,
"target": "sales",
"reason": "High-intent pricing request"
},
"policy": {
"allowed_actions": [
"route_lead",
"draft_email",
"summarize",
"human_review"
],
"allowed_targets": [
"sales",
"support",
"ops",
"none"
],
"minimum_confidence": 0.8
},
"external_action_executed": false
}This demo only returns a decision signal. A person controls what any later n8n step may do.
What this catches
Missing fields and invalid JSON stop at the boundary.
Unknown actions or targets cannot silently continue.
Uncertain output routes to a person at your chosen threshold.
Move the same boundary into n8n
The $19 one-time package adds the ready-to-import webhook workflow, bounded retry path, contract tests, implementation course, and protected delivery.