Vanilla JavaScript Login Status Monitor

In the realm of web development, JavaScript remains a cornerstone technology. While frameworks and libraries can simplify development, mastering Vanilla JavaScript provides a solid foundation for understanding the language’s intricacies. As a best practice, I recommend that developers, especially those new to the field, focus on honing their Vanilla JavaScript skills before exploring frameworks.

Seamless Server Interaction: Establish a robust communication channel between the client and server, enabling efficient data exchange and synchronization. By implementing a well-designed user login tracking system, developers can significantly enhance the security, performance, and overall quality of their web applications.

now Lets us dive into the code:

firstly, lets a variable to access device local storage:

Secondly we gonna create an object variable that has the value of initial/default data. The same data values will be updated whenever new data arrived or changed. here is the variable:

Now lets create a function to save data into a device local storage:

now lets create our main part of the code, which is our reducer function, this function will be responsible for controlling data by insert, update, delete from our device local storage.

Here is the code:

Explanation of above code:

When the action.type is “LOGOUT”, the reducer: Removes/delete the user data from storage using storage.removeItem. Returns a new state object with the following properties: userData: Set to null. timestamp: Set to null. isLoggedIn: Set to false. Default Case JavaScript default: return state; If the action.type doesn’t match any of the above cases, the reducer simply returns the current state without making any changes.

Finally but not least, the following is the function that will be used as an output of the correct data.

As you can see, Our code ensures secure data management by removing user data upon logout. Additionally, we utilize timestamps to enable automatic logout after a prolonged period of inactivity. For a comprehensive implementation, including DOM manipulation examples, please refer to our GitHub repository: or https://github.com/TrevoDng/logig-status-monitor-frontend

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Author
Trevor Elelwani Netshisaulu.