How to handle jwt token and refreshtoken in a client side express application?

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Hey guys i have two express applications,
one is the backend where im having a rest api for all crud operations to the db.

The Client is also structured in a seperate express application were I only do GET requests, there im working with templates to consume data from the rest api.

The way of login is a fetch request at the html template file, included in a script tag below of this file, because i have to set an EventListener to the login submit button and have to extract the username and password, if the login was successful i store the token into localstorage and the refreshtoken into a cookie.

The problem is now i need the token also in the nodejs/express side to call the api and render some other data into the views but from nodejs/express i dont have access to the browsers localstorage.

What can i do here, what is the right way for handeling such a case?
Thank you for any help!

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