node js check if called from module

To check if a Node.js script is called as a module, you can use the require.main property. Here is a step-by-step explanation of how to do it:

1. In your Node.js script, use the require.main property to access the main module object. This object represents the module that was originally loaded by Node.js.

2. Check if the require.main object is equal to the module object. The module object represents the current module. If they are equal, it means that the script is being run directly.

3. If the require.main object is not equal to the module object, it means that the script is being called from another module. In this case, the script is being used as a module and not as the main script.

By following these steps, you can determine whether a Node.js script is called as a module or as the main script. This can be useful in scenarios where you want to execute different code based on how the script is being used.