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Learn Node.js: The Complete Course for Beginners

Process

Learn how to use the Node.js process object to manage the current runtime, handle critical events like exit, beforeExit, and uncaughtException, and utilize common methods and streams for better application control.

We'll cover the following...

The process object

The process object is a global that allows us to control the current process. It also has methods that can provide useful information about the process. Being an instance of the EventEmitter class, it has a few important events that we should know about. Let’s take a look at them.

Node.js
console.log('This is the first message');
process.on('beforeExit', (code) => {
  console.log('Process beforeExit event with code:', code);
});
process.on('exit', (code) => {
  setTimeout(() => { console.log('This will not work.') }, 0);
  console.log('Process exit event with code:', code);
});
console.log('This is the second message');
// process.exit()

exit and beforeExit

These two events can be very useful at times. Consider the scenario:

  • You wish to save your program progress to the cloud once it is done processing. The beforeExit event is perfect for this job. It is firedemitted
...