How to Map an Array in AWS Step Functions While Keeping Parent ID?

Question

Description:

I am using AWS Step Functions and need to process an input JSON that looks like this:

{
  "id": "123456",
  "bubble": [
    {
      "type": "flex",
      "altText": "001"
    },
    {
      "type": "flex",
      "altText": "002"
    }
  ]
}

My goal is to iterate over the bubble array while keeping the id field in each mapped output. The expected results should be:

1.

{
  "id": "123456",
  "bubble": {
    "type": "flex",
    "altText": "001"
  }
}

{
  "id": "123456",
  "bubble": {
    "type": "flex",
    "altText": "002"
  }
}

How can I achieve this transformation using AWS Step Functions and Map state? Any guidance on the state machine definition or JSONPath would be appreciated.

Jerry Jeremiah · Accepted Answer · 2025-08-18 03:13:30Z

0

I think you can use an ItemSelector inside the Map to get what you want: https://docs.aws.amazon.com/step-functions/latest/dg/input-output-itemselector.html

{
  "ItemSelector": {
    "id.$": $.id,
    "bubble.$": "$$.Map.Item.Value"
  }
}

edited Aug 18 at 3:13

answered Aug 12 at 23:16

Jerry Jeremiah

9,6933 gold badges27 silver badges37 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

How to Map an Array in AWS Step Functions While Keeping Parent ID?

Description:

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

Description:

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related