Uses for Object oriented programming with JavaScript

Here's an overview of it from Mozilla: https://developer.mozilla.org/en-US/docs/Learn/JavaScript/Objects/Object-oriented_JS

To further answer though, it's uses could be varied. You may have a Node + Express backend for your website, therefore you will need something to help process and manage your user data and interact with your database. This can be incredibly helpful.

However, this is just as helpful for front-end technologies. Let's say you have a membership website -- for instance, Dog Walkers of New York. Your site discusses events, group leaders, and more.

Therefore, when you are showing your membership data to a user, you will likely get information from the database: the neighborhood of the dog walker, the information on the owner, the information on the dogs in general. Perhaps you have different classes of dogs (small, medium, large) which is utilized for different events, then you have an events section. Every category you can think of can likely be represented by an object.

The neighborhood brought it from a database may be comprised of a title, location data, and potentially an array of Event Ids. Your owner can be an object of name, address, a sub-object contain name-value pairs for phone numbers, a sub-object of emergency contacts, a sub-object of veterinarian information, and an array of Dog Objects.

Your dog object could then have properties of name, breed, age, size, then possibly an array or object listing vaccinations on record.

This all can be data stored in a database that needs to be represented when you load a membership site for dog walkers. :)