Guard clause — refuse bad orders

Fail fast, loudly: a zero-amount order trips Stop & Error with a coded message, and the whole run fails exactly where the data went wrong. THIS TEST IS SUPPOSED TO FAIL — that's the demo. Flip amount to 100 to watch it pass.

What’s inside

4 nodes — every type links to its full reference page.

Step	Node	Type
Suspicious order	Inject	`input.inject`
Amount > 0?	IF	`logic.if`
Accept	Console	`utility.console`
Refuse	Stop and Error	`error-handling.stop-and-error`

Import it

Studio → Import — paste the JSON below (or the URL /docs/templates/guard-clause-refuse-bad-orders.json).

Or ask the AI Copilot with the JSON pasted after the phrase:

import this workflow json into a new workflow named "Guard clause — refuse bad orders"

Any credentials the nodes need are ${credential.…} references — add them once in Admin → Credentials and the template picks them up. Nothing secret ships in a template.

The workflow document (flowdrome.workflow.v1, 4 node types)

{
  "schemaVersion": "flowdrome.workflow.v1",
  "id": "",
  "name": "Guard clause — refuse bad orders",
  "version": "0",
  "status": "draft",
  "nodes": [
    {
      "id": "seed",
      "type": "input.inject",
      "label": "Suspicious order",
      "category": "trigger",
      "config": {
        "contentType": "application/json",
        "payload": {
          "orderId": "A-1005",
          "amount": 0
        }
      },
      "position": {
        "x": 0,
        "y": 23
      }
    },
    {
      "id": "sane",
      "type": "logic.if",
      "label": "Amount > 0?",
      "category": "flow",
      "config": {
        "path": "amount",
        "operator": "greaterThan",
        "value": 0
      },
      "position": {
        "x": 530,
        "y": 23
      }
    },
    {
      "id": "ok",
      "type": "utility.console",
      "label": "Accept",
      "category": "utility",
      "config": {
        "message": "order {{ $json.orderId }} accepted"
      },
      "position": {
        "x": 1060,
        "y": 0
      }
    },
    {
      "id": "stop",
      "type": "error-handling.stop-and-error",
      "label": "Refuse",
      "category": "utility",
      "config": {
        "message": "order {{ $json.orderId }} has amount 0 — refusing to invoice",
        "errorCode": "BAD_ORDER"
      },
      "position": {
        "x": 1060,
        "y": 178
      }
    }
  ],
  "edges": [
    {
      "id": "e0",
      "sourceNodeId": "seed",
      "sourcePort": "output",
      "targetNodeId": "sane",
      "targetPort": "input"
    },
    {
      "id": "e1",
      "sourceNodeId": "sane",
      "sourcePort": "true",
      "targetNodeId": "ok",
      "targetPort": "input"
    },
    {
      "id": "e2",
      "sourceNodeId": "sane",
      "sourcePort": "false",
      "targetNodeId": "stop",
      "targetPort": "input"
    }
  ],
  "triggers": [
    {
      "id": "t0",
      "nodeId": "seed"
    }
  ],
  "meta": {
    "snippets": [],
    "source": "template-gallery",
    "description": "Fail fast, loudly: a zero-amount order trips Stop & Error with a coded message, and the whole run fails exactly where the data went wrong. THIS TEST IS SUPPOSED TO FAIL — that's the demo. Flip amount to 100 to watch it pass."
  }
}

Generated from the verified demo corpus — this exact document seeds and runs on a fresh Flowdrome. Raw JSON: guard-clause-refuse-bad-orders.json.