Would it be possible to read what userdata is/contains
If the userdata is set up for it, you can use typeof(someUserdata) to check the type.
In what case you want to read a user’s data containments?
There’s a roblox plugin that lets you view datastores through roblox studio, but it costs robux.
However the plugin is called Datastore Manager
https://create.roblox.com/marketplace/asset/701506235/DataStore-Editor
To get read the values you can use pairs like this:
for i,v in pairs(DataTable) do
print(v)
end