How do I make variables accessible across my entire Node.js program?

Understanding Global Variables in Node.js

In Node.js, global variables can be declared by setting variables without specifying a scope. However, this approach has limitations, as it does not make the variable available in required files.

To address this issue, you can use the global object.

global._ = require('underscore');

By assigning a variable to the global object, you're making it available to the entire Node.js program. This means any file or module that runs within the program will have access to the _ variable.

On the other hand, assigning variables to the global scope without using the global object may not work as expected. For example, the following code won't make the _ variable available in required files:

_ = require('underscore');

This is because the variable _ is assigned to the local scope of the current module and is not accessible by other modules.

Therefore, it's recommended to use the global object to declare global variables in Node.js, ensuring they're available throughout the program.

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