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AWS Step Functions
Developer Guide

Fail

A Fail state ("Type": "Fail") stops the execution of the state machine and marks it as a failure.

The Fail state only allows the use of Type and Comment fields from the set of common state fields. In addition, the Fail state allows the following fields:

Cause (Optional)

Provides a custom failure string that can be used for operational or diagnostic purposes.

Error (Optional)

Provides an error name that can be used for error handling (Retry/Catch), operational or diagnostic purposes.

Because Fail states always exit the state machine, they have no Next field nor do they require an End field.

For example:

"FailState": {
  "Type": "Fail",
  "Cause": "Invalid response.",
  "Error": "ErrorA"
}