Code techniques

• Variables declaration & destructuring with values in default:

  • const { code = 500, message = 'server error' } = error;

  • const PORT = process.env.PORT || 5000;
  • const { DB_HOST } = process.env;
  • const { DB_HOST, PORT = 5000 } = process.env;
  • Simplest code writing:
    • const dotenv = require('dotenv');
      dotenv.config();
    The same with chaining:
    • require('dotenv').config();