Node Environment Variable

console.log(`NODE_ENV: ${process.env.NODE_ENV}`);  -> undefined 

console.log(`app ${app.get('env}`).  -> development

by default env is development

to change it, write the line below in the command line

export NODE_ENV=production

Configuration

npm i config

• create a "Config" folder in the root
• create a default.json and write settings in it
• create a development.json and write the settings you want to overwrite or new ones in it
• create a production.json and write the settings you want to overwrite or new ones in it

using it in modules

const config = require('config');
...
...
config.get('applicationName') 
// or for complex objects 
config.get('mail.servername');

Secrets

• save sensitive settings in environment variables. ie app_password
• create a file named custom-environment-variables in config folder
• just like production.json overwrite the variable like

"mail":{
   "password":"app_password"
 }