Example

In this very simple example, we'll create the best game ever conceived; it rewards you for simply existing!

Or in boring words, the player's score goes up as they stay in the game.

Assumptions

The client and server should have access to the same UnifiedData ModuleScript. In this example, it'll just be a direct child of ReplicatedStorage.

The code under Server is located in ServerScriptService while the code under Client is located in StarterPlayerScripts.

Server

--!strict
local Players = game.Players

-- We specifically grab the Server code for UnifiedData
local UnifiedData = require(game.ReplicatedStorage.UnifiedData.Server)

-- The second argument of CreateTable is optional;
-- We could set it if say we wanted the creator to start with 9999 score
-- This returns a ServerProxy; however by overriding the return type,
-- it prevents mistakes when using strict type-checking
local ScoreTable = UnifiedData.CreateTable("Score") :: {[string]: number}

local function onPlayerJoined(player: Player)
    if ScoreTable[player.Name] == nil then ScoreTable[player.Name] = 0 end
    task.spawn(function()
        while player.Parent ~= nil do
            wait(1)
            ScoreTable[player.Name] = ScoreTable[player.Name] + 1
        end
    end)
end
for _, player in pairs(Players:GetPlayers()) do
    onPlayerJoined(player)
end
Players.PlayerAdded:Connect(onPlayerJoined)

Client

-- Here we grab the Client code for UnifiedData
local UnifiedData = require(game.ReplicatedStorage.UnifiedData.Client)
local Player = game.Players.LocalPlayer

-- We could potentially use UnifiedData.GetProxy instead, however
-- there's a chance that the data hasn't replicated yet, necessitating
-- that we use UnifiedData.WaitForProxy instead.
local ScoreTable = UnifiedData.WaitForProxy("Score")
ScoreTable.Changed:Connect(function(name)
    if name == Player.Name then
        print(`Score is now {ScoreTable[name]}`)
    end
end)

wait(10)

print(`My score is currently {ScoreTable[Player.Name]}`)

With all the code in place, when testing in studio you should see print statements in the output reporting the score for you, while effectively all you've done is make a table and modify it on the server and read from it on the client.