demo post request syntax error

[Shellmode]

demo post request at API Server should not include comma in json content

img_b64_str=$(base64 -i assets/demo.png)
curl -X POST "http://localhost:8080/generate" \
     -H "Content-Type: application/json" \
     -d '{
           "image": "'"$img_b64_str"'",
         }' \
     -o test2.glb

should be

img_b64_str=$(base64 -i assets/demo.png)
curl -X POST "http://localhost:8080/generate" \
     -H "Content-Type: application/json" \
     -d '{
           "image": "'"$img_b64_str"'"
         }' \
     -o test2.glb