Filemaker JSON Malformed

I'm trying to retrieve data from Filemaker with the script attached.

Please help me to improve my code!

Notes in filemaker :

Within cURL options, precede each quotation mark with a backslash. For example, to specify an HTTP header for Content-type: application/json, the text expression for Specify cURL options is:

"--header \"Content-type: application/json\""

Thanks!

Best regards