Roblox Ban Script

Understanding How Player Bans Actually Work in Roblox

Banning players in Roblox isn't as simple as calling one function. The approach you take depends entirely on what kind of game you're running and whether you need permanent bans or temporary kicks. Most people who ask about a Roblox Ban Script are looking for something that just works out of the box. It exists, but it's usually not what you think it is. At its core, a ban script works by maintaining a list of player IDs that are not allowed access to your game. When a player attempts to join, the script checks their user ID against that list. If there's a match, the player gets removed from the server. That's the basic loop. The complexity comes from where you store that list and how you persist it across server restarts. I built a system once using DataStore for the ban list. Seemed straightforward. The problem was that DataStore calls have a rate limit of about 6 requests per second per key, and when you have multiple servers reading and writing to the same datastore simultaneously during a mass-ban event, things break. Players would get kicked, but the ban wouldn't actually save. I spent three days debugging what I thought was a logic error before realizing it was a throttling issue. Switched to a custom HTTP endpoint for the ban list storage and that solved it completely.

Setting Up a Ban System for Your Game

Start by creating a module script that handles all ban operations. This keeps your code organized and makes it easier to modify later. The module should expose functions for adding a ban, removing a ban, checking if a player is banned, and loading the ban list when the server starts. For storing ban data, you have a few options. DataStore is the default choice and works fine for small games with low traffic. But if your game expects more than a couple hundred concurrent players, I'd recommend setting up a simple external database through an HTTP service. SQLite through a Node.js backend works well, or even a Google Sheets spreadsheet as a dead-simple storage layer if you're not ready to deal with actual databases. Here's the server-side structure you need. A ServerScript inside ServerScriptService that runs when the game loads:

local Players = game:GetService("Players")
local DataStoreService = game:GetService("DataStoreService")
local HttpService = game:GetService("HttpService")

local banStore = DataStoreService:GetDataStore("BannedPlayers_v2")
local bannedPlayers = {}

local function loadBans()
    local success, result = pcall(function()
        return banStore:GetAsync("bannedList")
    end)
    if success and result then
        bannedPlayers = HttpService:JSONDecode(result) or {}
    end
end

local function saveBans()
    local success, err = pcall(function()
        banStore:SetAsync("bannedList", HttpService:JSONEncode(bannedPlayers))
    end)
    if not success then
        warn("Failed to save bans: " .. tostring(err))
    end
end

loadBans()

Players.PlayerAdded:Connect(function(player)
    if bannedPlayers[tostring(player.UserId)] then
        player:Kick("You are banned from this game.")
    end
end)

game:BindToClose(function()
    saveBans()
end)

This is the foundation. It's minimal, but it handles the core functionality. When a player joins, their UserId is checked against the table. If they exist in the banned list, they get kicked immediately. The BindToClose ensures your bans are saved when the server shuts down. Owning a game means you need a way to actually ban people through gameplay, not by editing scripts every time. Command-based ban systems are the standard approach. You parse player chat messages for commands like /ban [player] [reason] and execute the ban logic when detected. The tricky part is permission management. You don't want every player typing ban commands into chat. Check the player's rank in your admin system or verify their UserId against a hardcoded whitelist. I keep a simple array of admin UserId values and only allow those players to run ban commands.

Here's the command handler you can attach to the PlayerChatted event:

local ADMIN_IDS = {12345678, 87654321}

local function isAdmin(player)
    return table.find(ADMIN_IDS, player.UserId) ~= nil
end

Players.PlayerChatted:Connect(function(message, player)
    if not isAdmin(player) then return end
    
    local args = HttpService:JSONDecode(message)
    if args and args.command == "ban" then
        local targetPlayer = Players:GetPlayerByUserName(args.target)
        if targetPlayer then
            bannedPlayers[tostring(targetPlayer.UserId)] = {
                reason = args.reason or "No reason provided",
                bannedBy = player.Name,
                timestamp = os.time()
            }
            targetPlayer:Kick("You have been banned from this game.")
            saveBans()
            player:Chat("Banned " .. targetPlayer.Name .. " for: " .. args.reason, ChatServiceRunner.SpeakerColor)
        else
            player:Chat("Player not found.", ChatServiceRunner.SpeakerColor)
        end
    end
end)

Storing the reason and ban timestamp along with the UserId is important. You'll regret not doing this when a player appeals their ban and you have no record of why they were banned in the first place. DataStore throttling is the biggest issue you'll encounter. Every call to GetAsync or SetAsync counts against your quota. If you're saving the entire ban list to DataStore on every single ban action, you'll hit limits fast in a popular game. The workaround I ended up using was batching saves. Instead of writing to DataStore on every ban, I keep changes in memory and flush to DataStore every 30 seconds or when the server closes, whichever comes first. This dropped my DataStore usage by roughly 90 percent. Another thing that catches people off guard is bypass. A player who gets banned can simply create a new account and join again. Nothing in Roblox's system prevents this at the game level. If you need to prevent alt accounts, you're looking at device-based banning, which requires tracking the player's deviceId or using external detection services. That's significantly more complex and has its own set of privacy considerations under Roblox's terms.

Temporary bans are another area where people make mistakes. Storing ban expiration times in DataStore works, but you need a cleanup system that runs periodically to remove expired bans. Otherwise your ban table grows indefinitely and your save operations get slower over time. A simple every-five-minutes check that removes any entry where the expiration timestamp is in the past does the job.

When to Use Roblox's Built-in Systems Instead

Not every situation calls for a custom ban script. If you're running a group and need to ban players across all your games, Roblox Group settings handle that natively. Group ranks and permissions override most custom systems anyway, so layering a custom ban on top of group bans just creates conflict points. I learned this the hard way when a player complained they were banned in my obby but could still join the group's main experience. Turns out the group ban wasn't syncing because they were different services. If you're building a moderation tool for a larger project, consider using Roblox's existing moderation APIs like the Chat filtering service and the reporting system instead of reinventing everything. A custom Roblox Ban Script gives you full control, but it also means you're responsible for every edge case that comes with it. That responsibility adds up quickly.