Test with Simulate

Simulate is Knot Core’s dry-run mode: you walk the graph and see data passed between nodes without risky writes (depending on node type and settings).

🔁 Start a simulation

1. Open the workflow in the editor.
2. Click Simulate (toolbar).
3. Provide input data if the trigger requires it (fake webhook payload, sample ID).
4. Step through or let the engine run the chain.

Click to enlarge

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Each node shows:

• resolved inputs ({{ }} replaced);
• simulated output or error;
• approximate duration.

🔁 Inspector and mocks

The side inspector lists the simulated run context. You can:

• confirm a Dolibarr field exists before an HTTP POST;
• copy JSON for a support ticket;
• spot a miswired edge (undefined data).

Some connectors support mocks: fake HTTP response, email logged but not sent.

🔁 Simulate vs a real run

Aspect	Simulate	Real run
Dolibarr writes	Often blocked or rolled back	Persisted
Email	Log only (per config)	Real SMTP
HTTP	May be mocked or real	Live network
Audit log	Test trace	Production trace

Tip

Always do one final manual run on a test record before activating a Cron or webhook trigger.

🔁 Debug an expression

If {{ nodes.xxx.output.field }} is empty:

1. Check node name (xxx) in the inspector.
2. Confirm the source edge points to that node.
3. Verify the field exists on the Dolibarr object (introspection).

Next steps

• Activate a workflow
• Logic connector

Practical guides

• Unpaid invoice reminders
• New order notification
• Low-stock alert