function serializeForm(form) {
const data = {};
for (const [key, value] of new FormData(form)) {
if (key in data) {
data[key] = [].concat(data[key], value);
} else {
data[key] = value;
}
}
return data;
}
// Usage
document.querySelector('form').addEventListener('submit', (e) => {
e.preventDefault();
const payload = serializeForm(e.target);
console.log(payload);
// { name: 'Alice', tags: ['js', 'php'], agree: 'on' }
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