When working with Node.js EventEmitter, you can pass data to your listeners by providing arguments to the emit method. The arguments you pass after the event name are delivered in order to the listener functions. This allows you to send any kind of information—such as objects, strings, or numbers—to the listeners when the event occurs.

You are not limited to a single event type in your custom emitters. You can register listeners for as many event types as you need by calling on (or addListener) with different event names. Each listener will only respond to its specific event, making it easy to organize your code for different scenarios. For example, you might have one event for successful data retrieval and another for handling errors, as shown above. This flexible system lets you handle a wide variety of application needs with clear, maintainable code.