How to make a codes system in Roblox (redeem codes)

Updated 2026-10-17 · Roblox and game developers · by CyberMax

Short answer

Keep the codes in a server-only table with a reward and an expiry time, normalise what the player types (trim, uppercase), check that the code exists, isn't expired and isn't in the player's saved list of used codes, then grant the reward and add the code to that list.

Copy-paste code

ServerScriptService/Codes.server.lua

local CODES = {
	RELEASE = { coins = 500, expires = os.time({ year = 2026, month = 12, day = 31, hour = 23 }) },
	THANKYOU = { coins = 250 },
}

local function redeem(data, typed)
	local code = string.upper((string.gsub(typed or "", "%s", "")))
	local c = CODES[code]
	if not c then return false, "Invalid code" end
	if c.expires and os.time() > c.expires then return false, "This code has expired" end
	data.usedCodes = data.usedCodes or {}
	if data.usedCodes[code] then return false, "Already redeemed" end
	data.usedCodes[code] = true
	data.coins = (data.coins or 0) + c.coins
	return true, "+" .. c.coins .. " coins"
end

game.ReplicatedStorage.RedeemCode.OnServerInvoke = function(player, typed)
	if typeof(typed) ~= "string" or #typed > 30 then return false, "Invalid code" end
	local data = profiles[player]
	if not data then return false, "Loading" end
	return redeem(data, typed)
end

Good to know

Keep CODES in a server Script or ServerStorage module so exploiters can't read the list.

Rate-limit the RemoteFunction (for example, one try per second per player) so nobody can brute-force codes.

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Questions

Can I add codes without updating the game?

Yes, store them in a DataStore or MemoryStore and read them on server start, but keep the same checks.

Why uppercase?

So "release", "Release " and "RELEASE" all work.

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