Full-Stack React Projects - Second Edition

Retrieving credentials

In our frontend components, we will need to retrieve the stored credentials to check if the current user is signed in. In the isAuthenticated() method, we can retrieve these credentials from sessionStorage.

mern-skeleton/client/auth/auth-helper.js:

isAuthenticated() {    if (typeof window == "undefined")      return false    if (sessionStorage.getItem('jwt'))      return JSON.parse(sessionStorage.getItem('jwt'))    else      return false}

A call to isAuthenticated() will return either the stored credentials or false, depending on whether credentials were found in sessionStorage. Finding credentials in storage will mean a user is signed in, whereas not finding credentials will mean the user is not signed in. We will also add a method that allows ...