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Node.js listen and emit events

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by shivanisanju03 dot icon Updated: Mar 31, 2023

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"Events" are built-in modules that Node JS, where you can create and listen for your events. Use the require() method to include a built-in event module. All event properties and methods are an instance of an EventEmmiter object.

 

A netServer emits an event each time a peer connects to it, and an fs readstream emits an event when the file is opened. Many objects in a node emit events like this. All objects which emit events are the instance of events EventEmiter. You can either use the EventEmitter object directly or derive from it and create your own object with all the EventEmitter functionality. 


Below is an example of Node.js listening and emitting events 

Fig: Preview of the output that you will get on running this code from your IDE.

Code


Node.js listen and emmit events

JavaScriptdotLines of Code : 10dotLicense : Strong Copyleft (CC BY-SA 4.0)

const EventEmitter = require('events');

class MyEmitter extends EventEmitter {}

const myEmitter = new MyEmitter();
myEmitter.on('event', () => {
   console.log('an event occurred!');
});
myEmitter.emit('event');

Instructions


Follow the steps carefully to get the output easily.

  1. Install Node and Visual Studio Code on your computer.
  2. Create a new folder in your local.
  3. Open that folder in Visual Studio Code.
  4. Then create a new JS file(Eg: node.js).
  5. Copy the snippet using 'copy' button and paste it into that file.
  6. Save the file and open the terminal, use this command 'node filename(node.js)' to get the output in your console.


I hope you found this helpful.


I found this code snippet by searching for ' Node.js listen and emmit events ' in kandi. You can try any such use case!

Environment Tested


I tested this solution in the following versions. Be mindful of changes when working with other versions.

  1. The solution is created and tested in Visual Studio Code 1.74.1.
  2. The solution is tested in Node v18.15.0.


Using this solution, we are able to implement Node.js listen and emit events in nodejs with simple steps. This process also facilities an easy way to use, hassle-free method to create a hands-on working version of code which would help us to implement Node.js listen and emit events 

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