I am trying to make a deployment diagram for my web application. I am using MVC architectural pattern but I am unsure if this should be included:

I am using reactjs, Inertia js, laravel and MySQL. How can I show this on my diagram?
I am not really sure how to represent Inertia JS
This diagram is a good start and all depends on the level of detail you want to share. You could indeed give a very high level picture of your architecture:

But this does not give good picture of the details that you provide:
- Laravel means that the components are executed in an enclopsing PHP exectution environment, the PHP interpreter.
- Eloquent ORM is not really the connection (this is why I preferred ORM connection insted of Eloquent ORM). Eloquent is a component that supports your model that extends eloquent classes. I also understand that it's part of Laravel
- I understand that you're doing server side rendering, as you don't show any js on the browser. But I have to confess that I'm not very knowledgeable about Laravel & Inertia. In this case, you'd certainly have a node.js execution server on your webserver as well. If not, you'll understand the principles and be able to fine tune the diagram to your needs.
- Regarding Inertia, I ualso nderstand that there is a js client side component to install for react, and a server side for laravel.

Now this is quite detailed already, and I've not even shown the dependencies between the components. Maybe it's more than what you want to provide. A simpler way could then to define some own stereotypes to show what's done with laravel:
