Refer to <ahref='http://superuser.com/a/284351/275797'target='_blank'rel='nofollow'>this answer</a> on Super User.
### If Using Node
Add the [dotenv](https://www.npmjs.com/package/dotenv) package to your application. You can then store your environment variables in a `.env` file. Be sure to remember to add `*.env` to your `.gitignore` file.