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+---
+title: msgpack
+---
+
+FiveM includes embedded support for [MessagePack](https://github.com/thers/msgpack-lite/), a highly efficient binary serialization format. This functionality is available across Lua, JavaScript, and C# runtimes, enabling compact and optimized data transmission between clients and servers.
+
+## Key Features
+
+| Feature                     | Description                                                                                 |
+|-----------------------------|---------------------------------------------------------------------------------------------|
+| Compact Serialization       | Converts structured data into a compact binary format for efficient transmission.           |
+| Cross-Language Support      | Ensures seamless compatibility between Lua, JavaScript, and C# MessagePack implementations. |
+| Built-In Functions          | No external libraries are required; FiveM provides native MessagePack support.              |
+
+
+## Reserved Extension Types
+
+FiveM reserves specific extension types for internal use, ensuring compatibility across different runtimes.
+
+Some of the reserved extension types such as `Vector2`, `Vector3`, `Vector4`, `Quaternion` where added to CFXLua and need conversion to be used in JavaScript or C#.
+
+```ts
+enum ReservedExtensionTypes {
+    FunRef = 10,
+    LocalFuncRef = 11,
+    Vector2 = 20,
+    Vector3 = 21,
+    Vector4 = 22,
+    Quaternion = 23,
+    EntityState = 41,
+    PlayerState = 42
+}
+```
+
+## Lua API
+
+### Encoding and Decoding
+
+In the Lua runtime, you can use the built-in `msgpack.pack`, `msgpack.pack_args` and `msgpack.unpack` functions for serialization and deserialization.
+This allows you to convert Lua tables into a MessagePack-encoded binary string and vice versa.
+It is particularly useful for handling large or complex data structures in multiplayer interactions.
+
+### Examples
+
+Using `msgpack.pack`
+```lua
+-- Define the player data
+local player = {
+    source = 1,
+    name = 'JohnDoe'
+}
+
+-- Serialize the player data into a binary string
+local serialized = msgpack.pack(player)
+
+-- Deserialize the binary string back into the original Lua data structure
+local deserialized = msgpack.unpack(serialized)
+
+-- Output the player's source
+print(deserialized.source) -- Output: 1
+```
+
+Using `msgpack.pack_args`
+```lua
+-- Define player data
+local player = {
+    source = 1,
+    name = 'JohnDoe'
+}
+
+-- Define player items
+local playerItems = {
+    { name = "bread", count = 1 }
+}
+
+-- Serialize player and item data into a binary string
+local serializedData = msgpack.pack_args(player, playerItems)
+
+-- Deserialize the binary data back into Lua data structures
+local deserialized = msgpack.unpack(serializedData)
+
+-- Extract player and items data from the deserialized result
+local playerData = deserialized[1]
+local itemsData = deserialized[2]
+
+-- Print the player's source and the items in JSON format
+print(playerData.source, json.encode(itemsData)) -- Output: 1, [{"name":"bread","count":1}]
+```
+
+Adding custom types
+```lua
+-- Define a custom type
+local myCustomType = {}
+-- Set the custom type metatable
+setmetatable(myCustomType, {
+    -- Constructor function
+    __call = function(self --[[myCustomType]], arg1, arg2, arg3)
+        return setmetatable({
+            value1 = arg1,
+            value2 = arg2,
+            value3 = arg3
+        }, getmetatable(self))
+    end,
+    -- Extension type used for serialization and deserialization reference
+    -- A number between 0 and 127 not in ReserverExtensionTypes enum
+    __ext = 90, --[[number]]
+    -- Pack function for serialization
+    __pack = function(instance --[[myCustomType]], extensionType --[[number]])
+        return json.encode({
+            value1 = arg1,
+            value2 = arg2,
+            value3 = arg3
+        })
+    end,
+
+    __unpack = function(encodedData --[[string]], extensionType --[[number]])
+        local data = json.decode(encodedData)
+        return myCustomType(data.value1, data.value2, data.value3)
+    end
+})
+
+-- Register the custom type with MessagePack
+msgpack.extend(getmetatable(myCustomType))
+
+-- Define an instance of the custom type
+local customInstance = myCustomType(1, 2, 3)
+
+-- Serialize the custom instance into a binary string
+local serializedCustom = msgpack.pack(customInstance)
+
+-- Deserialize the binary string back into the original custom instance
+local deserializedCustom = msgpack.unpack(serializedCustom)
+
+-- Output the custom instance values
+print(deserializedCustom.value1, deserializedCustom.value2, deserializedCustom.value3) -- Output: 1, 2, 3
+
+-- Output the custom instance type
+local metatable = getmetatable(deserializedCustom)
+print(metatable == getmetatable(myCustomType)) -- Output: true
+```
+
+## JavaScript API
+
+### Encoding and Decoding
+
+The JavaScript runtime includes embedded `msgpack.encode`, `msgpack.decode`, `msgpack_pack` and `msgpack_unpack` functions.
+These methods allow you to serialize JavaScript objects into binary format for network transmission and deserialize binary data back into usable objects.
+The API seamlessly integrates with other FiveM JavaScript utilities, making it straightforward to handle structured data.
+
+### Internal [codec](https://github.com/thers/msgpack-lite/blob/master/lib/codec-base.js)
+
+The JavaScript runtime includes a built-in codec for encoding and decoding data.
+This codec powers functions like **[emit](/docs/scripting-reference/runtimes/javascript/functions/emit-server)**, **[emitNet](/docs/scripting-reference/runtimes/javascript/functions/emitNet-server)**, **[on](/docs/scripting-reference/runtimes/javascript/functions/on-server)**, **[onNet](/docs/scripting-reference/runtimes/javascript/functions/onNet-server)**.
+To utilize this functionality directly, you can use the global functions `msgpack_pack` and `msgpack_unpack`.
+
+### Structures
+```ts
+function msgpack_pack(data: any): string // Internal codec serialization function
+function msgpack_unpack(data: string): any // Internal codec deserialization function
+```
+
+### Examples
+
+Using internal codec
+```ts
+// Define a player object
+const player = {
+    source: 1,
+    name: 'JohnDoe'
+};
+
+// Serialize the player object into a binary string using the internal codec
+const serialized = msgpack_pack(player);
+
+// Deserialize the binary string back into the original JavaScript object
+const deserialized = msgpack_unpack(serialized);
+
+// Access and log the 'source' property from the deserialized object
+console.log(deserialized.source); // Output: 1
+```
+
+Using `msgpack.encode` and `msgpack.decode`
+```ts
+// Create a custom MessagePack codec
+const codec = msgpack.createCodec();
+
+// Serialize the player object into a binary string using the custom codec
+const serialized = msgpack.encode(player, { codec });
+
+// Deserialize the binary string back into the original JavaScript object
+const deserialized = msgpack.decode(serialized, { codec });
+
+// Log the 'source' property from the deserialized object
+console.log(deserialized.source); // Output: 1
+```
+
+Adding custom types
+```ts
+// Use msgpack_codec for serializing and deserializing data (e.g., StateBag, events), or opt for a custom codec if needed
+const codec = msgpack_codec;
+
+// Define a custom type with name and value
+class MyCustomType {
+    constructor(name, value) {
+        this.name = name;
+        this.value = value;
+    }
+}
+
+// Set up the serialization behavior for MyCustomType using the identifier (96)
+msgpack_codec.addExtPacker(96, MyCustomType, (instance) => {
+    // Serialize the MyCustomType instance to a binary string, including the name and value
+    return msgpack.encode({ name: instance.name, value: instance.value });
+});
+
+// Set up the deserialization behavior for MyCustomType using the same identifier (96)
+msgpack_codec.addExtUnpacker(96, (data) => {
+    // Deserialize the binary string and reconstruct the MyCustomType instance
+    const { name, value } = msgpack.decode(data);
+    return new MyCustomType(name, value);
+});
+
+// Serialize an instance of MyCustomType to a binary string
+const serialized = msgpack_pack(new MyCustomType('SomeRandomName', 'SomeRandomValue'));
+
+// Deserialize the binary string back into a MyCustomType instance
+const deserialized = msgpack_unpack(serialized);
+
+// Output the deserialized object and check if it's an instance of MyCustomType
+console.log(deserialized, deserialized instanceof MyCustomType); // Output: true, MyCustomType instance
+```
+
+## C# API
+TODO
+
+## Example Scenarios
+
+- **Lua to JavaScript**: A Lua client serializes a player's state and sends it to a JavaScript server, where it is deserialized and processed.
+- **JavaScript to C#**: A JavaScript client sends serialized configuration data to a C# server for persistent storage or advanced processing.
+- **C# to Lua**: A C# server encodes and sends a player's inventory to a Lua client, which unpacks it for display or interaction.