Environment Variables

Use environment variables to manage configuration, like database connection strings, API keys, etc.

a. Install dotenv

codenpm install dotenv

b. Create a .env File

PORT=3000
MONGODB_URI=mongodb://localhost/mydatabase

c. Use Environment Variables

In app.js:

require('dotenv').config();

const port = process.env.PORT || 3000;
const mongooseUri = process.env.MONGODB_URI;

mongoose.connect(mongooseUri, {
  useNewUrlParser: true,
  useUnifiedTopology: true
});