AWS Step Function Lambda error catch clause custom error with new fields

Solution 1:

Unfortunately there is no handy way to handle such case. A workaround is using an extra state with builtin intrinsic function States.StringToJson:

"Catch": [ {
  "ErrorEquals": [ "States.ALL" ],
  "ResultPath": "$.error-info",
  "Next": "Error Handler Preprocessing"
}]

...

"Error Handler Preprocessing": {
  "Type": "Pass",
  "Parameters": {
    "Error.$": "$.error-info.Error",
    "Cause.$": "States.StringToJson($.error-info.Cause)"
  },
  "ResultPath": "$.error-info",
  "Next": "Error Handler"
},

"Error Handler": {
  "Type": "Task",
  ...
}

References

• https://docs.aws.amazon.com/step-functions/latest/dg/amazon-states-language-intrinsic-functions.html