Client-side Storage Options: Local, Session and Cookie
In web development, creating engaging and interactive user experiences is vital. To achieve this, web applications often utilize client-side storage methods, which allow data to be stored and accessed directly within the user’s browser.
In this article, we will explore client-side storage, its options and their use cases.
What is Client-side storage?
Information stored in the user's web browser is referred to as client-side storage. It gives web apps the ability to store and retrieve data directly from the user's device, enabling local data storage without requiring continuous server contact.
Cookie storage, session storage, and local storage are the three commonly used client-side storage options.
Local Storage
Web applications can retain data in the user's browser permanently thanks to a storage method called local storage. It can be stored indefinitely and is made up of key-value pairs.
Cache data, program settings, and user preferences are commonly kept in local storage. The majority of contemporary web browsers have a 5–10 MB local storage limit per origin.
There are four commonly used methods to manage data in local storage:
setItem(key, value)to add the key and value to the storage or update the value if the key already exists.getItem(key)to get the value based on the key.removeItem(key)to remove the specific local storage item based on the key.clear()to remove all the data in the local storage.
Use Case of local storage
User Preferences: User preferences, including language preference, theme selection, and display settings, can be stored in local storage. As a result, the user experience on the website can be tailored for each session.
Caching: Local storage allows websites to cache frequently requested files or resources, which lowers server load and boosts overall performance.
Partially filled data: Users can continue filling out forms even if they navigate away from the page or unintentionally close the browser thanks to local storage's ability to store partially finished form data.
Session Storage
Similar to local storage, session storage is exclusive to the active tab or session. It is frequently employed to keep a web application's state intact as a user interacts with it.
Session storage is helpful for keeping track of data that must remain accessible for the duration of the session but does not require persistence over browser restarts or several sessions. The capacity limit for session storage is often between 5 and 10 MB.
Similar to local storage, there are four commonly used methods to manage data in session storage:
setItem(key, value)to add the key and value to the storage or update the value if the key already exists.getItem(key)to get the value based on the key.removeItem(key)to remove the specific session storage item based on the key.clear()to remove all the data in session storage.
Use Case of session storage
Multi-step processes: For multi-step processes, like a multi-page form, where data must be maintained throughout many steps until the process is finished, session storage may be helpful.
User Authentication: To keep users' login statuses intact during their browsing sessions, session storage might hold authentication tokens or session identifiers. It spares users from constantly logging in to access restricted portions of a website.
Shopping Carts: During a browser session, shopping cart data is frequently stored via session storage. It enables visitors to browse through various product pages, add items to their carts, and keep the contents of their carts until they finish their purchase or leave the website.
Cookie Storage
Prior to the release of HTML5, the only method for client-side data storage was through cookies. Along with every HTTP request, cookies are also delivered to the server. Due to this behavior, websites are able to remember user credentials and preferences, as well as personalize information. The server also gains access to the cookies.
Cookies can be created, changed, or read using JavaScript with document.cookies, just like local storage and session storage.
Persistent Cookies: Persistent cookies remain active between browser sessions and have an expiration date that is indicated in the Expires or Max-Age properties. Persistent cookies allow users to customize their experience or retrieve prior values even if they close and reopen their browser to visit the page. Until their expiration date or until the user voluntarily deletes them, they stay on the user's browser.
Session Cookies: Cookies used during sessions don't have an expiration date. They are not accessible from one session to the next; they are produced and saved on the user's browser exclusively for the duration of that session. Most of the time, session cookies are deleted automatically when the user leaves the tab or browser.
Use case of cookie storage
Personalization: User preferences, including chosen language, location, and customized settings, can be stored by cookies. This allows websites to adapt their user experience and deliver content according to the preferences of each individual.
Remembering user login: Users can avoid entering their login information again by using cookies to save session tokens or login credentials. This enables them to remain logged in during numerous browser sessions.
User tracking: Cookies are frequently used to gather analytics data and track user behavior. They give website owners the ability to gauge traffic, comprehend user behavior, and obtain information for bettering their sites.