contact_form.addEventListener('submit', (e) => { e.preventDefault()

    const formData = {
            name: names.value,
            email: email.value,
            subject: subject.value,
            message: message.value
    }

    let xhr = new XMLHttpRequest()

    xhr.open('POST', '/')
    xhr.setRequestHeader('Content-type', 'application/json')
    xhr.onload = function () {
            console.log(xhr.responseText);
            if (xhr.responseText == 'success') {
                    alert('email send');
                    names.value = "";
                    email.value = "";
                    subject.value = "";
                    message.value = "";
            } else {
                    alert('Something is wrong')
            }
    }

    xhr.send(JSON.stringify(formData));

});

this is code

POST http://127.0.0.1:5500/ 405 (Method Not Allowed) error that i face