JMeter - How to convert string value to a list

Question

I have an API that returns the following json:

{
    "GetAppendixListResponse": {
        "GetAppendixListResult": {
            "FileList": {
                "string": ["3602","3587"]
            },
            "Code": "0"
        }
    }
}

The debug sampler looks like:

JMeterVariables:
AppendixCode_1=["3602","3587"]
AppendixCode_ALL=["3602","3587"]
AppendixCode_matchNr=1

How can I convert ["3602","3587"] from string to a list (for loop_controller)?

Answer 1

Add JSON JMESPath Extractor as a child of the request which returns the above JSON and configure it like:

This way you will be able to see the following JMeter Variables in the Debug Sampler:

AppendixCode_1=3602 
AppendixCode_2=3587
AppendixCode_matchNr=2

Hence the variables could be used in the ForEach Controller