JSONDecode converts a string into a Lua table. What you are doing is printing a lua table, which will print the memory address I believe. You need to use JSONEncode to print it - that will return a stringified version of the table for you to print.
Also the fact is that you need a valid roblo security for this function. It’s impossible to tell unless you give the cookie.(this cookie is dangerous and can lead to you or someone else’s account being hacked if someone gets it.)
There is nothing you can do. Unless your going to ask the user for their roblo security cookie(agiasnt the rules) then it’s impossible. You also would need a proxy server for the roblox api access. In simple terms it’s impossible.