SignInController.php

<?php

namespace App\Http\Controllers\Auth;

use App\Http\Controllers\Controller;
use Illuminate\Http\Request;
use Auth;

class SignInController extends Controller
{
    public function __invoke(Request $request){
        $credentials = request(['email', 'password']);
        if (!$token = Auth::attempt($credentials)) {
            return response()->json(['error' => 'Unauthorized'], 401);
        }
        return response()->json(compact('token'));
    }
}