add clear stored data

helpers/storage.js

@@ -11,7 +11,18 @@ export function storeFormData({ org, name, email, street, zip, city }) {
   )
 }
 
+export function clearFormData() {
+  getStorage().removeItem(FORM_DATA_KEY)
+}
+
 export function loadFormData() {
   const dataAsString = getStorage().getItem(FORM_DATA_KEY)
-  return JSON.parse(dataAsString || '{}')
+  let result = null
+  try {
+    result = JSON.parse(dataAsString)
+  } catch (e) {
+    console.error(`localStorage ${FORM_DATA_KEY} has invalid data stored`)
+  }
+
+  return result
 }