Save Data to Session Storage

  sessionStorage.setItem("MyString", "Hello");

  sessionStorage.setItem("MyInt", 123);

Read Data from Session Storage

  let MyString = sessionStorage.getItem("MyString");
  if (MyString === null)
    MyString = "Default value";

  let MyInt = sessionStorage.getItem("MyInt");
  if (MyInt === null)
    MyInt = 0;
  MyInt = parseInt(MyInt);    //sessionStorage.getItem returns a string

Remove Data from Session Storage

  sessionStorage.removeItem("key");

Remove All (Clear session Storage)

  sessionStorage.clear();