How would you read what userdata contains

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