Config variables

In the config/config.js file, we will define some server-side configuration related variables that will be used in the code, but should not be hardcoded as a best practice, as well as for security purposes.

mern-skeleton/config/config.js:

const config = {
  env: process.env.NODE_ENV || 'development',
  port: process.env.PORT || 3000,
  jwtSecret: process.env.JWT_SECRET || "YOUR_secret_key",
  mongoUri: process.env.MONGODB_URI ||
    process.env.MONGO_HOST ||
    'mongodb://' + (process.env.IP || 'localhost') + ':' +
    (process.env.MONGO_PORT || '27017') +
    '/mernproject'
}

export default config

The config variables defined are:

• env: To differentiate between development and production mode
• port: To define the listening port for the server
• jwtSecret: The secret key to be used to sign JWT
• mongoUri: The location of the MongoDB database for the project