How to Config properties in Express JS?

In Express JS, there are 2 ways that for configuring the properties:

With process.ENV:

A file with the name “.env” is to be created within the project folder.
All the properties are to be other within the “.env” file.
Any of the properties will be employed in server.js.

With require.JS:

A file with the name “config.json” is to be created within the config folder within the project folder.
The config properties are to be present within the config.json file.
Now, ought to be accustomed to access the config.json file.