Cookie Not Being Set In Browser

I am trying to set a cookie which has my auth token in it. I can see it being returned in the response header set-cookie: xxxxxx but for whatever reason, the browser is not storing

Solution 1:

When you use http://localhost:3001 for the frontend, your frontend and backend servers share the same domain (even being on different ports), so you can see the cookie set by a request to your backend server (and so linked to backend server domain).

When you use different domains, you just can't see the cookie as dev tools are attached to a page that belongs to another domain. But the cookie is saved and will be sent back with subsequent requests.