I’m honestly kind of new to react, and when trying to submit a signup form after filling out the details, I keep getting the error “Unexpected end of JSON input”, and on my node terminal it shows this:

11:58:50 PM [vite] http proxy error: /api/auth/signup
AggregateError [ECONNREFUSED]:
    at internalConnectMultiple (node:net:1116:18)    
    at afterConnectMultiple (node:net:1683:7)

this is the code block:

import { useState } from "react";
import toast from "react-hot-toast";
import { useAuthContext } from "../context/AuthContext";

const useSignup = () => {
    const [loading, setLoading] = useState(false);
    const { setAuthUser } = useAuthContext();

    const signup = async ({ fullName, username, password, confirmPassword, gender }) => {
        const success = handleInputErrors({ fullName, username, password, confirmPassword, gender });
        if (!success) return;

        setLoading(true);
        try {
            const res = await fetch("/api/auth/signup", {
                method: "POST",
                headers: { "Content-Type": "application/json" },
                body: JSON.stringify({ fullName, username, password, confirmPassword, gender }),
            });

            const data = await res.json();
            if (data.error) {
                throw new Error(data.error);
            }
            localStorage.setItem("chat-user", JSON.stringify(data));
            setAuthUser(data);
        } catch (error) {
            toast.error(error.message);
        } finally {
            setLoading(false);
        }
    };

    return { loading, signup };
};
export default useSignup;

function handleInputErrors({ fullName, username, password, confirmPassword, gender }) {
    if (!fullName || !username || !password || !confirmPassword || !gender) {
        toast.error("Please fill in all fields");
        return false;
    }

    if (password !== confirmPassword) {
        toast.error("Passwords do not match");
        return false;
    }

    if (password.length < 6) {
        toast.error("Password must be at least 6 characters");
        return false;
    }

    return true;
}

hoping that this can be answered soon, thanks!