I'm developing a MERN stack application. I'm getting the following error on console.

the error:

Failed to load resource: net::ERR_CONNECTION_REFUSED

my routes:

const router = express.Router();

router.get('/', getPosts);
router.post('/', createPost);

export default router;

client api index:

 const url = 'http://localhost:5000/posts';

    export const fetchPosts = () => axios.get(url);
    export const createPost = (newPost) => axios.post(url, newPost)