How to Use Local Storage Access Token in Server-Side Data Fetching with Next.js

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The Problem: Access Tokens and Local Storage

Access Token Storage: After authentication, the access token is stored in local storage.

Server-Side Data Fetching: When you need to fetch data on the server side, you require access to the token stored in local storage.

This limitation can lead to issues where you cannot authenticate requests to your backend during server-side data fetching.

The Solution: Utilizing Cookies for Token Management

Since local storage is not accessible on the server, the best workaround is to use cookies to manage your access tokens. Cookies can be easily accessed during both client-side and server-side operations, making them an ideal substitute for local storage in this scenario.

How to Implement Cookies for Access Tokens

To make use of cookies for storing your access token, you can follow these steps:

Step 1: Set the Token in Cookies

After the user successfully authenticates, you will want to save the access token in a cookie. Below is an example of how to set the token in cookies:

[[See Video to Reveal this Text or Code Snippet]]

In this code snippet, we utilize the setCookie function (commonly provided by libraries like cookie) to store the token in a cookie called "token". Here’s what happens in the code:

Encoding: The token is encoded to ensure it's safe to store in a cookie.

Options: The maxAge option is set to determine the lifespan of the cookie, and path indicates the accessibility of the cookie.

Step 2: Access the Cookie on the Server-Side

Once the token is stored in cookies, you can easily access it whenever you need to perform server-side data fetching. Here's an example of how you can retrieve the token from cookies:

[[See Video to Reveal this Text or Code Snippet]]

In this line, you are retrieving the access token from the request's cookies. This way, you enable server-side data fetching while maintaining security for authenticated requests.

Conclusion

By following the outlined approach, you can improve the functionality of your application significantly, leveraging the strengths of both client and server-side data handling.

Feel free to leave your thoughts or questions in the comments below! Happy coding!