Log Inside Dataweave

Use log function to help with debugging DataWeave scripts. A Mule app outputs the results through the DefaultLoggingService, which you can see in the Studio console. Let’s see how we can log inside the dataweave.

I have used the below dataweave expression to log the message from inside the Dataweave Transformation

Input:

{
  "status": "success",
  "data": [
    {
      "id": 1,
      "employee_name": "Tiger Nixon",
      "employee_salary": 320800,
      "employee_age": 61,
      "profile_image": ""
    }
  ]
}

Dataweave Expression:

%dw 2.0
output application/java

---
log(" Current Time Stamp ",now())
++
log("Error"," Error From Dataweave ")
++
log(" Employee Id Is ",payload.data[0].id)

Output (You can see on anypoint console),all the logs are printed as shown below:

INFO 2020-04-10 19:58:18,372 [[MuleRuntime].cpuIntensive.06: [logging].loggingFlow.CPU_INTENSIVE @206c4a2a] [event: 85a17471-7b37-11ea-a90d-040e3cd1eac7] org.mule.weave.v2.model.service.DefaultLoggingService$: 
Current Time Stamp - |2020-04-10T19:58:18.371+05:30|

INFO 2020-04-10 19:58:18,373 [[MuleRuntime].cpuIntensive.06: [logging].loggingFlow.CPU_INTENSIVE @206c4a2a] [event: 85a17471-7b37-11ea-a90d-040e3cd1eac7] org.mule.weave.v2.model.service.DefaultLoggingService$: 
Error - " Error From Dataweave "

INFO 2020-04-10 19:58:18,377 [[MuleRuntime].cpuIntensive.06: [logging].loggingFlow.CPU_INTENSIVE @206c4a2a] [event: 85a17471-7b37-11ea-a90d-040e3cd1eac7] org.mule.weave.v2.model.service.DefaultLoggingService$: 
Employee Id Is - 1