Pass the message from event bus to ECS task using Event Rule

Question

I am trying with the Input parameter in the CFT. But its saying its not a

`Resource handler returned message: "JSON syntax error in input for target 
`

This is my event Pattern which is able to trigger the ECS task when I send someting starting with "trig". Samething I want to print in the file.

`{
  "detail": {
    "messageAttributes": {
      "operation": {
        "stringValue": [{
          "prefix": "trig"
        }]
      }
    }
  }
}`

I am using input [parameter](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-events-rule-target.html#cfn-events-rule-target-input)

`            "Input": "$.detail.messageAttributes.operation.stringValue"
`

It would be great if you could help me with this

Answer

Take a look at your template and validate the syntax. Here is a article that walks through several examples. In your case, take a look under **Confirm that Conditions is specified as a string** in [CFT Template Validation ](
https://repost.aws/knowledge-center/cloudformation-template-validation )

Answer

You are passing a collection of map types. However, that is not a valid type for cloud formation parameter values. String value is going to need to be comma separated list of strings, if I understand what you are trying to do.

See here: https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/parameters-section-structure.html

Pass the message from event bus to ECS task using Event Rule

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