Is there any way for us to see the complete string in the result of a mapper instead of a drop down arrow?
In the preview window you can change the Preview Type to JSON. Also, in the lower right part of the Mapper snap it will show the output of all fields.
From the Preview Type dropdown menu you can select to view the data in JSON format, as a Table (default), or as Raw Data.
Also there is an option to download output of the Snap as a JSON file where you can see full names/values of the fields :