Laravel API Response Sending HTML Page from laravel/breeze

I'm trying to make a transition from my project being a monolith to having a separate frontend and backend. In the original authentication implementation I used laravel/breeze. For this API I want to use Jsonwebtoken. However, I have problems as below.

I tried to make an API response on the controller but the response I received was instead a login page when testing in Postman. Here are some snippets of my code:

AuthController.php:

    public function __construct()
    {
        $this->middleware('auth:api', ['except' => ['login', 'register']]);
    }

 public function userProfile()
    {
        try {
            if (!Auth::check()) {
                return ApiResponses::unauthorized("Unauthorized");
            }

            $user = Auth::user()->toArray();

            return ApiResponses::ok($user, "Success to login");
        } catch (Exception $e) {
            return ApiResponses::serverError("An error occured: " . $e->getMessage());
        }
    }

ApiResponses.php

    public function toResponse($request): JsonResponse
    {
        $response = [
            'success' => $this->httpCode >= 200 && $this->httpCode < 300,
        ];

        if (!$response['success']) {
            $response['errorMessage'] = $this->errorMessage;
            Log::error('API Error: ' . $this->errorMessage);
        } else {
            $response['message'] = $this->message ?: '';
            $response['data'] = $this->data;
        }

        return response()->json($response, $this->httpCode, [], JSON_UNESCAPED_UNICODE);
    }

    public static function unauthorized(string $errorMessage = "Unauthorized")
    {
        return new static(401, [], $errorMessage);
    }

    public static function ok(array $data, string $message = '')
    {
        return new static(200, $data, '', $message);
    }

api.php

Route::controller(AuthController::class)->prefix('v1')->group(function () {
    Route::post('auth/login', 'login');
    Route::post('auth/register', 'register');
    Route::get('auth/profile', 'userProfile');
    Route::post('auth/logout', 'logout');
});