Table of Contents
Why RemoteEvents Exist
In Roblox, scripts can run on the server or on the client. Server scripts control the shared game world. LocalScripts control what a single player sees and does on their own device. These two sides cannot safely change each other’s data directly, so they must communicate.
RemoteEvents are Roblox objects that let the client and the server send messages to each other. They do not run code by themselves. Instead, they carry a signal, plus optional data, from one side to the other. A script on the other side listens and reacts when the signal comes in.
RemoteEvents are part of secure multiplayer design. They let you send requests from the client, handle important logic on the server, and then send results back to the client.
RemoteEvents send messages, not authority. The server must always decide what is allowed, never trust the client.
Where RemoteEvents Live in Roblox
RemoteEvents are instances that you create in Roblox Studio. They are usually stored in ReplicatedStorage or ReplicatedFirst so both server scripts and LocalScripts can find them.
You typically create a RemoteEvent in Studio like any other object. For example, you might insert a RemoteEvent under ReplicatedStorage and rename it to DamageEvent or CoinCollected. A clear name makes it easier to know what that event is for.
Once it exists, any script or LocalScript that can access that container can get a reference to it using WaitForChild or FindFirstChild. A common pattern is:
local remote = game.ReplicatedStorage:WaitForChild("MyRemoteEvent")
Client to Server Communication with RemoteEvents
When you want something to go from a LocalScript on the client to the server, you use the :FireServer method on a RemoteEvent. This sends a signal from that specific player’s client up to the server scripts.
A typical flow is:
A LocalScript reacts to some player input, such as a button press or a key press.
The LocalScript calls MyRemoteEvent:FireServer(...) and passes any data it needs.
A Script on the server listens to that RemoteEvent with OnServerEvent and runs logic when it receives the signal.
Inside the server’s OnServerEvent function, the first argument is always the player who sent the event. Any extra values you sent in :FireServer arrive after that.
Important rule: When a RemoteEvent fires from the client, the server receives the sending player as the first parameter in the OnServerEvent function.
Server to Client Communication with RemoteEvents
RemoteEvents also work in the other direction. Server scripts can call :FireClient to send a message to one specific player, or :FireAllClients to send to everyone.
The receiving side is always a LocalScript on the client. That LocalScript connects to the RemoteEvent using OnClientEvent. When the event fires, the function you connected will run, and any data the server sent becomes arguments of that function.
A typical flow is:
The server finishes some logic, for example giving coins or starting a round.
The server script calls MyRemoteEvent:FireClient(player, ...) or MyRemoteEvent:FireAllClients(...).
Each LocalScript that has connected to OnClientEvent on that RemoteEvent receives the signal and can update UI, play sounds, or run other client side effects.
The client does not receive any implicit player parameter here. All arguments come from what the server passed into FireClient or FireAllClients.
RemoteEvents vs RemoteFunctions
RemoteEvents only send messages. They do not return values. They are one way at a time. The sender does not wait for an answer. This makes them good for actions like “player pressed jump pad” or “coins updated” where you just notify the other side.
RemoteFunctions are different and are covered in other parts of the course. They allow a request and a response cycle. For most game actions that can be handled as fire and forget, RemoteEvents are safer and simpler.
If you find yourself trying to ask the other side a question and needing an immediate answer, that belongs to RemoteFunctions, not RemoteEvents.
Data Flow Patterns with RemoteEvents
RemoteEvents often carry simple data between client and server. For example, they might send an integer, a string, or a Vector3. You can send multiple values in one fire call, such as FireServer(amount, position, actionName).
Although you can send complex tables, beginners should start with simple data flows. Each call to FireServer, FireClient, or FireAllClients has an ordered list of arguments. The listening function must read them in the same order.
A common pattern is to use a clear event name like PurchaseRequest and then send a string that describes what kind of purchase. The server uses the first argument to branch logic.
Important rule: Keep RemoteEvent messages small and clear. Only send the data the other side truly needs. Do not send unnecessary objects or extremely large tables.
Naming and Organizing RemoteEvents
Since multiplayer games can have many RemoteEvents, good naming and organization are important. You usually group events by purpose inside a folder under ReplicatedStorage, such as Remotes or Events. Inside that, each RemoteEvent gets a descriptive name like RequestDamage, UpdateCoins, or RoundStarted.
Meaningful names help you see in scripts what that event does without reading all the code. For example, RequestDamage suggests it should be used by a client to ask the server to apply damage, while ShowDamageNumber suggests a server to client visual effect.
To reduce confusion, use a single consistent place for most gameplay RemoteEvents. Then both server and client scripts know exactly where to look.
Using RemoteEvents for Visual Feedback
Although the server controls core game state, RemoteEvents are often used to trigger visual effects on the client. For example, after the server applies damage, it might use a RemoteEvent to tell the client to play a hit effect or show floating text.
In this pattern, the server calls FireClient or FireAllClients with just enough information for the client to show the right effect, such as a position or a number. The LocalScript then does all the visual work, like changing UI or playing an animation. This keeps the server focused on logic and makes the game feel responsive.
Handling Timing and Order with RemoteEvents
RemoteEvents do not guarantee delivery time, but in practice they are very fast. The order of messages from one sender to one receiver is usually preserved. However, network conditions can still cause delays.
Because the sender does not wait for a reply, the script that fires a RemoteEvent must not assume that the other side has already reacted. For example, if the client asks the server to buy an item, it should only show the confirmed purchase after the server sends a separate RemoteEvent back.
When you design message flows, think in terms of steps. First, the client sends a request. Next, the server checks and applies. Finally, the server notifies the client of the result. Each step can use its own RemoteEvent call.
Security Concerns Specific to RemoteEvents
RemoteEvents are the main path for the client to request actions from the server. Because clients can be modified by exploiters, every OnServerEvent handler on the server must check any data that came in.
For example, if the client says “I collected 1,000,000 coins,” you must not just trust that value. The server should compute rewards itself, or at least clamp and check the range of any client provided numbers.
Important rule: Treat all client messages from RemoteEvents as untrusted. Always validate and limit what the client can ask the server to do.
Even though this chapter focuses on RemoteEvents, all secure multiplayer systems rely on this idea. RemoteEvents are powerful but must be used with careful checks in the server code.
Debugging and Testing RemoteEvents
RemoteEvents can feel invisible because they are just signals. To debug them, you can insert print statements in both the sender and receiver scripts to confirm they are firing and receiving correctly.
In Studio, you can test client and server behavior by starting a play session with multiple clients. This allows you to see that a RemoteEvent from one client is reaching the server and then updating other clients.
If you see nothing happening, check these points. Confirm that the RemoteEvent exists in the location both scripts expect. Ensure the name is exactly the same and that you used WaitForChild when needed. Make sure the correct side is using the correct method, client uses FireServer, server uses FireClient or FireAllClients.
By combining clear names, careful data, and basic logging, you can build reliable communication with RemoteEvents that supports your multiplayer mechanics.