Parse Excel to JSON format

[monikagmk12]

I am trying to read an attachment file from a attachment variable to parse data in it and build a JSON payload to use that information on a variable. to make any progress , I cant get past the parser.parse line, not seeing any error too. testing below script in a fix script and then use it it in a client callable script include

 var jsonData = [];
 var attachmentSysId = '12f78a92938407509f98fa252603d6d6';
 gs.info('AttachmentSysId--->' + attachmentSysId);
 // Uses sn_impex namespace to parse attachment stream
 var parser = new sn_impex.GlideExcelParser();
 var attachmentStream = new GlideSysAttachment().getContentStream(attachmentSysId);
 gs.info('AttachmentStream--->' + attachmentStream);

 if (attachmentStream) {
     gs.info('AttachmentStreamExists');
     parser.parse(attachmentStream);
     while (parser.next()) {
         // Collects row data into the JSON array
         gs.info('ParserExists');
         jsonData.push(parser.getRow());
     }
 }

 gs.info(JSON.stringify(jsonData));


Output:

*** Script: AttachmentSysId--->12f78a92938407509f98fa252603d6d6
*** Script: AttachmentStream--->com.glide.communications.GlideScriptableInputStream@74f0306d
*** Script: AttachmentStreamExists
*** Script: []