Storing JWT in react context

Based on this requirement: Users remain logged in only as long as they have their browser open. Is there any recommendation for an SPA to not store JWT tokens in memory?

//app.js
const reducer = (state, action = null) => {
    switch (action.type) {
      case "SET_TOKEN":
        return {
          ...state,
          token: action.token,
        };
.............

//login.js
const token = await login(
          email.value,
          password.value
        );
dispatch({ type: "SET_TOKEN", token });