Save and populate a form with sessionStorage data from a previously submitted form using jQuery

sessionStorageForm.js

// Get the previous form data from sessionStorage
var previousForm = JSON.parse(sessionStorage.getItem("formData"));
// Iterate through the form fields and polulate the form with sessionStorage values
for (let item in previousForm) {
  $(`#${item}`).val(`${previousForm[item]}`);
}

$("#submit").click(function(){
  // Build sessionStorage object on form submit click
  var formData = {
    name: $("#name").val(),
    company_number: $("#company_number").val(),
    vat_number: $("#vat_number").val(),
    contact: $("#contact").val(),
    email: $("#email").val(),
    address: $("#address").val(),
    postcode: $("#postcode").val(),
    country: $("#country").val(),
    description: $("#description").val(),
    amount: parseFloat($("#amount").val()),
  };
  // Save the object to sessionStorage
  sessionStorage.setItem("formData", JSON.stringify(form_data));
  // Do something else here - Send an ajax post request etc.
});