Gracefully shutting down the application

Throughout the book, we have learned how to handle errors using try/catch blocks, error-first callbacks, catch for promises, and also events to handle errors but, sometimes, we need to handle errors globally.

Node.js provides a way to handle errors globally and gracefully shut down the application when an error occurs: using process.on(). You can also use process.exit() to exit the application with a specific exit code. This is useful in CI/CD pipelines, to indicate whether or not the application was shut down because of an error, and also in productive environments.

Events

There are many events that can be used to handle errors globally:

• uncaughtException: This event is emitted when an uncaught exception occurs
• unhandledRejection: This event is emitted when an unhandled rejection occurs
• exit: This event is emitted when the Node.js process is about to exit
• SIGINT and SIGTERM: These events are emitted when the Node...