Next js sessionstorage

In this guide, we will walk through session management in a Next.js app using Upstash Redis by learning what a “session” means in a web application, why Redis is a go-to choice for session management, how to set up an Upstash Redis database, and finally, how to integrate it into a Next.js application.

What is “Session”?

In a web application, “session” is a temporary, server-side storage mechanism used to maintain the state of a user's interaction with the application across multiple HTTP requests in a certain time interval.

Since HTTP is a stateless protocol, meaning each request is independent and doesn't "remember" previous interactions, sessions allow the server to track and store user-specific data such as authentication status, preferences, or any kind of activities of the user during their time on the website.

The server uses this ID to retrieve data related to the user session from a session storage, like Redis in this blog, every time the user interacts with the site.

Session in a web application is a great way to handle the following user interactions and state management:

• User Authentication: Sessi
  
  

  Why are document, window, localStorage and sessionStorage undefined in client components?

  I'm having this function in a client component

  But I'm getting an error saying .

  Why is that? Isn't it supposed to work in client components?

  The name "client component" is actually quite misleading. It's not a component that exclusively runs in the browser. It's a component that runs on the server and the client. The code inside the component is executed first on the server and the client or in other words, it's prerendered on the server and then hydrated on the client.

  During that initial prerendering, since the component is rendered on the server, it doesn't have access to the browser APIs named above. Hence you got that error.

  There are 2 fixes for this problem:

  • move logic using browser-specific APIs to (or an event handler, or any place that only runs on the client)
  • use the component dynamically with and

  Moving logic to

  If we move the logic inside hook, it will only run on the client. So, we can use these APIs without any problem.

  Note that if you do it this way, as you can see you need a loading state, which may c

  In web development, providing a seamless and user-friendly experience is crucial. One common scenario involves loading a list of blog posts and allowing users to fetch more posts with a "Load More" button. However, when users click on a blog post and then navigate back, the page often resets, and users lose their loaded content. In this blog post, we'll explore how to overcome this challenge by leveraging the power of in a Next.js application.

  Introduction

  When building dynamic pages in Next.js, it's essential to consider user interactions, especially when implementing features like paginated blog lists. By default, when users click on a blog post and then navigate back, the page resets to its initial state. To enhance this experience, we'll use to store and retrieve the blog list, along with other relevant state variables.

  Setting Up sessionStorage in useEffect

  Firstly, we'll use the hook to check whether there is data stored in when the component mounts. If data is found, we'll use it to set the initial state. This ensures that users see the previously loaded blog list even after navigating away from the page.

  Fetching and Updating Blog Lists

  Next, we'll modify the fun
  

  A Complete Guide to Session Management in Next.js

  Session management is a concept that flies under the radar in most applications. It’s built into every authentication library you are using, and seamlessly allows users to stay logged in, use different tabs, and stay secure while they are using your app.

  But because it is abstracted away by auth systems, it’s also opaque. How does session management work to keep track of your usage?

  Here, we want to build session management in Next.js without using any authentication library to show you what is really happening under the hood.

  What is a session?

  This might seem like a trivial question, but it doesn’t have a trivial answer. One of the reasons that session management is often abstracted away from developers is that it’s a difficult concept to grok and implement.

  A session is a series of interactions between a user and an application that occur within a given time frame.

  A session is initiated when a user logs in or starts interacting with the application and is typically terminated when the user logs out or after a period of inactivity. It is a way to preserve certain data/state across multiple requests between the client a
  
  

  In this guide, we will grasp how to durably store sessions with Redis on Vercel and Next.js.

  Sessions are used to persist user data across multiple requests. When a user visits your application, a session is initiated and used to store statistics related to that particular user. This is useful for maintaining user-specific states and persisting numbers across the lifecycle of a user's interaction with the application.

  For instance, consider a shopping site. Once a user adds an item to their cart, this data can be stored in a session. This allows the user to navigate to other parts of the site, and when they return to their cart, the items are still there. This is made feasible by the persistent nature of sessions.

  You can store and handle sessions with Redis. Here is a step-by-step explanation of how to build your own session store.

  We start off by importing the necessary modules. We install and import to ensure the server-side code can't be exposed to the client. We import from

  These functions handle the creation and retrieval of a session id which is distinct for each session. This id is used to differentiate between different users or sessions.

  These functions prov