fivem-nui-react

React hooks and utilities for FiveM NUI development.

Installation

npm install fivem-nui-react

Features

// Listen for NUI messages from FiveM client
useNuiEvent("eventName", (data) => {});

// Send request and get response
const data = await fetchNui("eventName", { payload });

// Hook with loading/error states and callback
const [fetch, { loading, error }] = useNuiCallback("eventName", (data) => {});

// Send data without expecting response
const [send, { loading, error }] = useSendNui("eventName");

// Check if running in browser (debug mode)
if (isEnvBrowser())

-- Send message from FiveM client to UI
SendNUIMessage({ action = "eventName", data = { key = "value" } })

-- Register callback for UI requests
RegisterNUICallback("eventName", function(data, cb)
  cb({ response = "data" })
end)

API

useNuiEvent

Listen for NUI messages sent from FiveM client.

useNuiEvent<T>(
  action: string,
  handler: (data: T) => void,
  options?: { mockData?: T; mockDelay?: number }
): void

Example:

import { useNuiEvent } from "fivem-nui-react";

function App() {
  const [visible, setVisible] = useState(false);

  useNuiEvent<{ show: boolean }>("toggleUI", (data) => setVisible(data.show), {
    mockData: { show: true },
    mockDelay: 1000,
  });

  return visible ? <div>UI Content</div> : null;
}

FiveM Client (Lua):

SendNUIMessage({
  action = "toggleUI",
  data = { show = true }
})

---

fetchNui

Send a request to the FiveM client and receive a response.

fetchNui<T, D>(
  eventName: string,
  data?: D,
  options?: { mockData?: T; mockDelay?: number; signal?: AbortSignal }
): Promise<T>

Example:

import { fetchNui } from "fivem-nui-react";

const player = await fetchNui<PlayerData>(
  "getPlayerData",
  { id: 1 },
  {
    mockData: { name: "John", level: 10 },
    mockDelay: 500,
  },
);

With AbortController:

const controller = new AbortController();

const player = await fetchNui<PlayerData>(
  "getPlayerData",
  { id: 1 },
  {
    signal: controller.signal,
  },
);

// Cancel the request
controller.abort();

FiveM Client (Lua):

RegisterNUICallback("getPlayerData", function(data, cb)
  local playerId = data.id
  cb({ name = "John", level = 10 })
end)

---

useNuiCallback

Hook for NUI requests with loading/error states. Calls the callback with response data.

useNuiCallback<T, D>(
  eventName: string,
  callback: (data: T) => void,
  options?: { mockData?: T; mockDelay?: number }
): [(data?: D) => Promise<T>, { loading: boolean; error: Error | null }]

Example:

import { useNuiCallback } from "fivem-nui-react";

function PlayerInfo() {
  const [player, setPlayer] = useState<PlayerData | null>(null);

  const [fetchPlayer, { loading, error }] = useNuiCallback<PlayerData>(
    "getPlayerData",
    (data) => setPlayer(data),
    { mockData: { name: "John", level: 10 }, mockDelay: 500 },
  );

  useEffect(() => {
    fetchPlayer({ id: 1 });
  }, [fetchPlayer]);

  if (loading) return <div>Loading...</div>;
  if (error) return <div>Error: {error.message}</div>;

  return <div>{player?.name}</div>;
}

FiveM Client (Lua):

RegisterNUICallback("getPlayerData", function(data, cb)
  local playerId = data.id
  cb({ name = "John", level = 10 })
end)

---

useSendNui

Hook for sending data to FiveM client without expecting a response.

useSendNui<D>(
  eventName: string,
  options?: { mockDelay?: number }
): [(data?: D) => Promise<void>, { loading: boolean; error: Error | null }]

Example:

import { useSendNui } from "fivem-nui-react";

function CloseButton() {
  const [closeUI, { loading }] = useSendNui<{ reason: string }>("closeUI");

  return (
    <button
      onClick={() => closeUI({ reason: "user_clicked" })}
      disabled={loading}
    >
      Close
    </button>
  );
}

FiveM Client (Lua):

RegisterNUICallback("closeUI", function(data, cb)
  SetNuiFocus(false, false)
  cb("ok")
end)

---

isEnvBrowser

Check if running in browser (outside FiveM).

import { isEnvBrowser } from "fivem-nui-react";

if (isEnvBrowser()) {
  console.log("Running in browser - debug mode");
}

---

Browser Testing

All hooks support mock data for testing in browser without FiveM:

Option	Description	Default
mockData	Data to return in browser mode	-
mockDelay	Delay in ms before returning	500
signal	AbortSignal for request cancellation (fetchNui only)	-

When isEnvBrowser() is true:

• useNuiEvent triggers handler with mockData after delay
• fetchNui returns mockData after delay
• useNuiCallback calls callback with mockData after delay
• useSendNui simulates delay only

---

TypeScript

All functions are fully typed:

interface PlayerData {
  name: string;
  level: number;
}

interface PlayerRequest {
  id: number;
}

// Typed response
const player = await fetchNui<PlayerData, PlayerRequest>("getPlayer", {
  id: 1,
});

// Typed callback
const [fetchPlayer, { loading }] = useNuiCallback<PlayerData, PlayerRequest>(
  "getPlayer",
  (data) => console.log(data.name),
);

Note

Most of the code in this project was written by AI and then manually reviewed and edited.

License

MIT