múltiplas formas formData js
var a = new FormData(); // using additional FormData object
var b = []; // using an array
for(var i = 0; i < document.forms.length; i++){
var form = document.forms[i];
var data = new FormData(form);
var formValues = data.entries()
while (!(ent = formValues.next()).done) {
// Note the change here
a.append(`${ent.value[0]}[]`, ent.value[1])
}
}
// here a will include all the data from all of your forms.
Drab Dotterel