How to pass custom variable as input to nested AWS Step Function

Question

I have two Step Functions, where one (Step Function 1) triggers the other (Step Function 2).

The first Step Function has as input:

{
    "ClusterId": "j-AAAAAAA",
    "CreateCluster": false,
    "TerminateCluster": false,
}

My goal is to take the variable ClusterId and pass it Step Function 2. This is how did it:

        "TRIGGER STEP FUNCTION 2": {
          "Type": "Task",
          "Resource": "arn:aws:states:::states:startExecution.sync",
          "Parameters": {
            "StateMachineArn": "arn:aws:states:us-east-1:312312312312123:stateMachine:STEP FUNCTION 2",
            "Input": {
              "ClusterId": "$.ClusterId",
              }
            }
          }

However, the StepFunction 2 input becomes:

{
    "ClusterId": "$.ClusterId",
}

And NOT:

{
    "ClusterId": "j-AAAAAAA",
}

Does anyone know how I can pass the value of ClusterId to StepFunction 2?

Appreciate the help

canovasjm · Accepted Answer · 2023-09-08 16:03:25Z

1

Just figured it out. Instead of:

{
    "ClusterId": "$.ClusterId",
}

It should have been:

{
    "ClusterId.$": "$.ClusterId",
}

edited Sep 8, 2023 at 16:03

canovasjm

5331 gold badge3 silver badges11 bronze badges

answered Aug 25, 2022 at 18:46

dp6000

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