Why can't I read a cookie from the API route in Next.js?

Why am I unable to read a cookie from the API route in Next.js, and what could be causing this issue?

There could be several reasons why you're unable to read a cookie from the API route in Next.js.Here are some common issues and solutions:

Cookie Configuration: Ensure that the cookie is properly set with the correct attributes, such as SameSite, Secure, and Domain. These attributes can affect whether the cookie is accessible in API routes.

Client-Side Request: Verify that the client-side request includes the necessary credentials to access the cookie. Use credentials: 'include' in your fetch request to ensure cookies are sent with the request.

Server-Side Handling: Make sure that the server-side code correctly retrieves the cookie. Use cookies().get('cookieName') to read the cookie value.

Browser DevTools: Check the browser's developer tools to see if the cookie is being set and sent correctly. Look for any errors or warnings related to cookies.

Same-Origin Policy: Ensure that the API route and the client-side code are served from the same origin, or configure CORS settings appropriately if they are not.