exchange/app/Http/Controllers/UserController.php

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use Auth;

class UserController extends Controller
{


    /**
     * Display the specified resource.
     *
     * @param  \App\ChinaBankSlip  $chinaBankSlip
     * @return \Illuminate\Http\Response
     */
    public function show(Request $request)
    {   

        $user = Auth::user();
        return $user->loadMissing('notifications');
    }

    public function notifications()
    {
        $notifications = auth()->user()->unreadNotifications()->limit(5)->get();
        return response()->json(['notifications'=> $notifications], 200);
    }
}