## Add Tap — With Expression Testing

Collapsible test section at bottom of the tap modal

Add Tap Modal — Test Expression (Recent Exchange)
Add Tap ✕
Attribute Name *
Processor *
unmarshal1 ▼
Language
simple▼
Target
OUTPUT▼
Expression *
${body.orderId}
Attribute Type
BUSINESS_OBJECT
CORRELATION
EVENT
CUSTOM
▼ Test Expression
Recent Exchange
Custom Payload
a1b2c3d4-e5f6-7890 · 245ms · 2 min ago
▼
Result
ORD-2024-78542
Test Expression — Custom Payload Mode
Add Tap ✕
⬆ Form fields above (attribute name, processor, language, target, expression, type)
▼ Test Expression
Recent Exchange
Custom Payload
{ "orderId": "ORD-2024-78542", "customer": { "id": "CUST-1234", "name": "Acme Corp" }, "total": 149.90 }
Error
Expression evaluation timed out (50ms limit)
Evaluated by agent order-svc-01 using Camel's simple language