How to repopulate form input value after Page Submit/Reload

$(function() {
  const formObj = sessionStorage.getItem('formObject');
  // Load object
  if (formObj != null) {
    console.log("Previous form session exists")
    let decodedObj = JSON.parse(formObj);
    console.log("sessionStorage object: " + decodedObj);
    console.log("value is: " + decodedObj["field1"]);

    // retrieve sessionStorage and populate input
    console.log("Loading previous session");
    document.getElementById("field1").value = decodedObj["field1"];
  }
});