Keydown function wont work inside normal script?

i need it to be in a normal script for this to work but they keydown function only seems to work in a local script

does anyone know why it only works in a local script?

--//Keystroke class
local debounce = true

script.Parent.Equipped:Connect(function()
	local tool = script.Parent
	local char = tool.Parent
	local player = game.Players:GetPlayerFromCharacter(char)
	local mouse = player:GetMouse()
	local v = script:WaitForChild('Value')
	mouse.KeyDown:Connect(function(key)
		print (key)
		-- stuff
	end)
end)

You cannot get the player's mouse in a Server Script. You can use a RemoteEvent for this to work.

Local Script:

--//Keystroke class
local debounce = true

script.Parent.Equipped:Connect(function()
    local tool = script.Parent
    local char = tool.Parent
    local player = game.Players:GetPlayerFromCharacter(char)
    local mouse = player:GetMouse()
    local RemoteEvent = game.ReplicatedStorage.RemoteEvent
    local v = script:WaitForChild('Value')
    mouse.KeyDown:Connect(function(key)
        RemoteEvent:FireServer(key)
    end)
end)

Server Script:

game.ReplicatedStorage.RemoteEvent.OnServerEvent:Connect(function(Player, Key)

	--Code
	print(Key)
end)

Let me know if it doesn't work. I'll try to help you.