Websites need other ways to remember previous user interactions to make anything more sophisticated than a static web page work. These days, Javascript frameworks like Vue.js, React.js, and others let developers create single-page applications (SPAs) that provide statefulness to the otherwise stateless web. Because they’re implemented as Javascript applications running in the user’s browser, they can keep track of what the user has done and render the app in a way that accounts for that shared history. However, the user’s browser is not a secure location for storing confidential information or data that the user shouldn’t have control of. When they need secure storage, developers turn to save data on the web server.

On the server, developers can use session storage, an in-memory cache for storing data that can be accessed quickly.

It’s the ideal place for saving temporary user information, such as whether the user is currently logged in. Session storage is typically kept in the runtime memory of the server and, as a consequence of that, requires each user to connect to the same server where their particular session was created.

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