process.env

An object containing the user environment variables. Used to store configuration, secrets, and deployment settings.

Syntax

nodejs

process.env.VARIABLE_NAME

Example

nodejs

const PORT = process.env.PORT || 3000;
const DB_URL = process.env.DATABASE_URL;
const isProduction = process.env.NODE_ENV === "production";

// Set via shell or .env file with dotenv:
// PORT=4000 node server.js