AWS Documentation » AWS Step Functions » Developer Guide » Amazon States Language » States » Pass

Pass

A Pass state ("Type": "Pass") simply passes its input to its output, performing no work. Pass states are useful when constructing and debugging state machines.

In addition to the common state fields, Pass states allow the following fields:

Result (Optional)

Treated as the output of a virtual task to be passed on to the next state, and filtered as prescribed by the ResultPath field (if present).

ResultPath (Optional)

Specifies where (in the input) to place the "output" of the virtual task specified in Result. The input is further filtered as prescribed by the OutputPath field (if present) before being used as the state's output. For more information, see Input and Output Processing.

Here is an example of a Pass state that injects some fixed data into the state machine, probably for testing purposes.

"No-op": {
  "Type": "Pass",
  "Result": {
    "x-datum": 0.381018,
    "y-datum": 622.2269926397355
  },
  "ResultPath": "$.coords",
  "Next": "End"
}

Suppose the input to this state is:

{
  "georefOf": "Home"
}

Then the output would be:

{
  "georefOf": "Home",
  "coords": {
    "x-datum": 0.381018,
    "y-datum": 622.2269926397355
  }
}