Hope this answers your query.

It should be noted that js-cookie can only interact with cookies which are accessible by javascript.

As @c3roe rightly mentioned, you are receiving null because there is no javascript-accessible cookie with the name authToken.

Debug Approach:

• Check if there is a cookie with name authToken via devTools.
• If the cookie is available is it a httpOnly cookie ( httpOnly cookies are inaccessible by javascript ).