How can I use environment variables in my configuration files?

How can I use environment variables in my configuration files?

You can use environment variables in your config files by referencing them with a specific syntax, like ${VARIABLE_NAME}.

Can you give me an example of how to set this up in a Node.js application?

Sure! In Node.js, you can use the 'dotenv' package. First, install it, then create a .env file with your variables.

What does the .env file look like?

.env file typically contains key-value pairs like:

DB_HOST=localhost
DB_USER=root
DB_PASS=password

How do I access these variables in my code?

You can access them using process.env.VARIABLE_NAME. For example, const dbHost = process.env.DB_HOST;.