How to use global variable in Node.js?

To use a global variable in Node.js, you can create it on the global object, which provides the scope of the entire project rather than just the file or module where the variable was created. Here's how you can do it:

// To create a global variable
global.globalString = "This is a global string";

// To access the global variable in any other file or module
console.log(global.globalString); // This will output: This is a global string

In Node.js, the global object is the equivalent of the window object in a browser environment. It contains properties and methods that are specific to the Node.js environment, such as global.process and global.console[2].

However, it's important to note that using global variables can lead to potential issues such as naming conflicts, difficulty in tracking the changes to the variable across different parts of the application, and can make your code harder to test and maintain. Therefore, it's generally recommended to avoid them when possible.

Instead, modern JavaScript encourages the use of module systems to import and export variables between files, which allows for better encapsulation and avoids polluting the global namespace. You can create a module that expor...