FormData: The FormData event

formdata-event.js

const newsletterForm = document.getElementById('newsletter-form');
newsletterForm.addEventListener('submit', () => {
    new FormData(newsletterForm);
});

newsletterForm.addEventListener('formdata', (event) => {
    const formData = event.formData;

    fetch('/some/api/endpoint', {
        method: 'post',
        body: formData
    })
        .then((response) => response.json())
        .then((result) => {
            console.log('Success:', result);
        })
        .catch((error) => {
            console.error('Error:', error);
        });
});