Client vs Server table refrence (require modulescript from local and server)

[0onima]

Alright, so when I require a module from a local script and a server script the table’s are two different tables. At first I assumed that they would possibly share a server, but now i’m thinking perhaps due to roblox’s filtering enabled? I’m not sure why, but if anyone could explain how the process of requiring the same modulescript from a server and a localscript works I would appreciate it

[HugeCoolboy2007 (omega)]

When you require a ModuleScript from the server, the server gets its own version of the module; When you require a ModuleScript from the client, each client gets its own version of the module

If the client and server had the same data, that would lead to security vulnerabilities since the server could be easily manipulated by an exploiter (likewise if each client had the same data)

[skipper987 (skip)]

Depends on your use-case, really. For instance: I have a ModuleScript called SharedUtils in my ReplicatedStorage, so it’s replicated to the client upon joining - but it’s also available to the server. Within that script, I have a bunch of functions that are useful to both the client an server. An example being a function that fetches a player’s character by name or player instance:

function module.get_character(duration: number, ...)
	duration = duration or 0
	
	-- DECLARE VARIABLES FOR LATER USE
	local character: Model
	local waited: number = 0
	
	-- ITERATE THROUGH VARIADIC ARGUMENTS
	for k, v in pairs({...}) do
			
		-- CHECK CLASS OF CURRENT ITERABLE
		if type(v) == "string" then
			print(script.Name, "String type found when fetching character")
			
			-- DECLARE VARIABLES FOR LATER USE
			local PLYRS: Players = game:GetService("Players")
			local plyr: Player
			
			-- WHILE THE PLAYER, CHARACTER ARE NOT FOUND AND TIMEOUT HAS NOT BEEN REACHED,
			-- FIND THE PLAYER AND CHARACTER
			while not plyr or not character and waited <= duration do
				plyr = PLYRS:FindFirstChild(v)
				character = plyr.Character
				if plyr and character then break end
				task.wait(1)
				waited += 1
			end
			return character
			
		-- CHECK CLASS OF CURRENT ITERABLE
		else if v:IsA("Player") then
				print(script.Name, "Player type found when fetching character")

				-- WHILE character IS NIL AND TIMEOUT HAS NOT BEEN REACHED,
				-- FIND THE CHARACTER
				while not character and waited <= duration do
					character = v.Character
					if character then break end
					task.wait(1)
					waited += 1
				end
				return character
			end
		end
	end
	
	return nil
end

However, as @HugeCoolboy2007 has mentioned: don’t keep stuff that should be executed or stored by the server accessible to the client!