How to sanitize a user input/form field _before_ sending to API via executeQuery?

[aMacDawg]

Current implementation: we have a longtext field within a form that a user can paste a large body of text into, and this body of text is POST'd as is to the endpoint for processing

However, we want to be able to "escape" all the special characters (especially the " that might be scattered throughout a large body of text) so that the JSON is not broken in transport.

This google search was disappointingly vague about how to do this search sample

Ideally there would be a way to just write some logic within the executeQuery action, so this current RequestBody:

{"essay_text": "{{ESSAY_TEXT}}" }

would look something like this:

{"essay_text": "{{ htmlspecialchars  ESSAY_TEXT}}" }

However, I can't be too choosey, so I would appreciate any pointers on the correct way to do this!