How to get user role from jwt token

In server side I have those code to login:

return jsonify({'email': email, 'token': create_token(email, isAdmin, password)})

In client side I need code to check login and isAdmin.

isLogged() {
if (localStorage.getItem('currentUser') &&
    JSON.parse(localStorage.getItem('currentUser')).email) {
  return true;
}
return false;
}

isAdmin(){
  //???
}

How can I get user role from token?