How to exit nodejs

Node.js is a JavaScript running environment based on the Chrome V8 engine and is widely used in the field of back-end development. However, after the project development is completed, we need to close the Node.js running environment to ensure that the application exits completely and releases system resources. This article explains how to exit Node.js.

1. Use CTRL C to terminate Node.js running

When starting Node.js running, we usually open the terminal, enter the startup command and execute it. To stop Node.js from running, press the "CTRL C" key combination in the terminal window. This will send a SIGINT signal to the Node.js process, forcing Node.js to terminate.

It should be noted that this method is only valid for Node.js processes started in the terminal. If Node.js is running in the background or started through the process manager, you cannot terminate the Node.js run using the "CTRL C" key combination.

2. Use the process.exit() method to exit Node.js running

The process.exit() method in Node.js can be used to exit the Node.js running process normally. When this method is called, the Node.js process terminates and returns the exit code passed to the method. If no exit code is passed, 0 is returned by default.

Here is an example of using the process.exit() method to exit Node.js:

process.exit(0); // 正常退出 Node.js 运行

In the above code, we call the process.exit() method and pass the exit code 0. This will cause the Node.js process to exit from the system with exit code 0.

It should be noted that this method will not work if the Node.js process is attached to the debugger.

3. Use SIGTERM signal to exit Node.js operation

In some cases, we may need to exit the Node.js process in a more elegant way than SIGINT. At this point, we can use the SIGTERM signal to request Node.js to cleanly shut down the process.

The following is an example of using the SIGTERM signal to exit Node.js:

process.on('SIGTERM', () => {
  console.log('Received SIGTERM signal');
  process.exit(0);
});

In the above code, we use the process.on() method to listen to the SIGTERM signal and when the signal is received Call the callback function. The callback function will print a message and call the process.exit() method to gracefully exit the Node.js process.

It should be noted that this method will not work if the Node.js process is attached to the debugger.

4. Use pm2 process manager to exit Node.js running

pm2 is a popular Node.js process manager that can be used to start, stop and manage Node.js processes. If we started the Node.js process using pm2, we can stop the process using the following command:

pm2 stop <进程名称或 ID>

In the above command, we used the pm2 stop command and specified the process name or ID that we want to stop. After executing this command, the pm2 process manager will send a SIGINT signal to the specified Node.js process to gracefully stop the process.

5. Summary

In this article, we introduced four methods to exit Node.js. If the Node.js process is started in the terminal, we can press the "CTRL C" key combination to terminate its operation; use the process.exit() method to exit the Node.js process normally; use the SIGTERM signal to request the Node.js process Graceful exit; use the pm2 process manager to stop the Node.js process.

It should be noted that different exit methods are suitable for different scenarios. When using it, we need to choose a method that suits us based on the actual situation. At the same time, if the Node.js process is running complex tasks or is running in a production environment, make sure to exit the process correctly to avoid unnecessary problems and data loss.

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