Group_id":10, "user_id":10751, "notification_level":3, "owner":false

group_id":10,
“user_id”:10751,
“notification_level”:3,
“owner”:false

okie what is your questions?

“group_id”:10,
“user_id”:10751,
“notification_level”:3,
“owner”:false

Try this instead (add quotes before group_id)

Try using double quotes for group_id.
Eg. “group_id”:10