react router V6.4.3 useLoaderData

I’m new to this and when I used V6.4.3 I found it updated to seem to authenticate using the loader, so I tried to simplify the original method. But when I use useLoaderData(), I get undefined.

Index.js

const router = createBrowserRouter(
  createRoutesFromElements(
    <>
      <Route path="sign-in" element={<SignIn />} />    
      <Route path="/" element={<App />} errorElement={<LayoutError />}>
      <Route
        path="data"
        loader={() => { AuthProvider() }}
        element={<DataLayout />}
      />
      <Route path="about" element={<About />} />
      </Route>
    </>
));
ReactDOM.createRoot(document.getElementById('root'))
  .render(
    <ThemeProvider theme={theme}>
      <RouterProvider router={router} />
    </ThemeProvider>
  );

AuthProvider.js

export default function AuthProvider(){
  //{token: '4r8gjifendinsd'}
  const user = authService.getCurrentUser();
  //{"token":"asdasdasd"}
  console.log(JSON.stringify(user));
  if (!user.token) {
    throw redirect("/sign-in");
  }
  return user;
}

DataLayout.js

export default function DataLayout() {
  const user = useLoaderData();
  //undefined
  console.log(user);
}

I checked the official github example, Auth is still the legacy method, and then I checked the manual again carefully, just to make sure that useLoaderData receives JSON. Did I overlook something?

>Solution :

Only thing that appears out of place to me is the loader function not returning any value.

loader={() => { AuthProvider() }} should be:

  • loader={() => {
      return AuthProvider();
    }}
    
  • or more succinctly, loader={() => AuthProvider()}

  • or even more succinctly loader={AuthProvider}

Example:

<Route
  path="data"
  loader={AuthProvider}
  element={<DataLayout/>}
/>

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