"Compose a string" UI not finding collection element

How To
1

Hi,

I am using “compose a string” to parse out an element from a collection that is returned from a call to the Sharepoint API.

This works fine for one scenario, where I can do this (via the UI):

"mapper": {
                "value": "{{5.headers.location}}"
            }, ...

whereas for another scenario with the same api call and return type, I can only do this:

"mapper": {
                "value": "{{3.headers}}"
            }, ...

i.e. the location element is not selectable despite it showing as a clickable element in the log of the API call output.

Can you help me debug why this is the case. To me, everything looks the same, yet the UI in the “Compose a string” module does not let me select the subelement of the collection in one case.

EDIT: Fixed through complete removal + reentry of modules, + manual entry of relevant element indexing.