How to set file title in nodejs

Node.js is a non-blocking JavaScript runtime environment that can complete many operations on the server side, such as building a web server, processing files, etc. In Node.js, we can easily view and distinguish different command line programs by setting file titles.

1. Process object in Node.js

In Node.js, there is a special global object process, which represents the status and control of the current Node.js process. Through the process object, we can access some underlying information of the operating system, such as CPU usage, memory usage, environment variables, etc.

The process object represents a process of a Node.js application. This process is also a process when running on the computer. On any operating system, the process object has some of the same properties and methods. The constructor of the process object is exposed to the user through the process module, which means that it can be used as long as the process module is introduced.

2. Set the file title

The process object process in Node.js has a method setProcessTitle. In Unix systems, you can set the title of the process by setting this method, so as to easily identify different command line program.

This method accepts a string as a parameter, which is the set process title. For example:

process.setProcessTitle("Node.js运行时环境");

In this way, when we enter the ps aux command in the terminal, we can see the process The title is "Node.js Runtime Environment".

This method only works under Unix systems and does not work under Windows systems. Therefore, on Windows, we have to use other methods to set the process title.

3. Use Windows API to set the process title

In Windows systems, we can use Windows API to set the process title. Specifically, it calls the SetConsoleTitle function. This function can set the title of the console window. The title of the process is also displayed in this window, so the title of the process is also modified.

node.js provides a spawn method to start a child process. We can operate the Windows API in the child process, which will not affect the running of the main process.

The following is a code that implements this function:

const spawn = require("child_process").spawn;

if (process.platform === "win32") {
  const setTitle = function(title) {
    const cmd = spawn("cmd.exe", ["/c", "title", title]);

    cmd.stdout.pipe(process.stdout);
    cmd.stderr.pipe(process.stderr);
  };

  setTitle("Node.js运行时环境");
}

Through the above code, we can set the title of the process under Windows system.

4. Summary

In Node.js, we can set the title of the process through the setProcessTitle method of the process object, so that when running multiple processes, we can easily identify which one they are. program. When this method cannot be used under Windows systems, we can also use Windows API to achieve the same function.

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