How to config properties in Express JS?

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

• With process.ENV:
• A file with the name “.env” is to be created inside the project folder.
• All the properties are to be added in the “.env” file.
• Any of the properties can be used in server.js.
• With require JS:
• A file with the name “config.json” is to be created in the config folder inside the project folder.
• The config properties are to be added in the config.json file.
• Now, require should be used to access the config.json file.