Since the package es4x-cli is added to the project and the scripts section is using it, running your application is as simple as:

> npm start

This command replaces the default npm operation by running the application on the JVM runtime.

Server listening at: http://localhost:8080/
Succeeded in deploying verticle

You can now interact with the application with a browser or a http client:

> curl localhost:8080

Hello from Vert.x Web!

To pass arguments use the double dash -- notation and all arguments after will be provided as is to the running application.