If you want to use.env file in your node js project. Hear all stapes.

npm install dotenv.

2: Stape creates .env file in the root directory.

3: Stape import dotenv in the main file at the top of the line.

import dotenv from "dotenv"

4: Stape after importing all package config the dotenv like that :

dotenv.config({
  path: './env'
});

It's the path of the env file path: './env'

5: Stape Added dotenv as an experimental in package.json in the script.

"scripts": {
"dev": "nodemon -r dotenv/config --experimental-json-modules src/index.js"
}

if come to any error replace this line "dev": "nodemon -r dotenv/config --experimental-json-modules src/index.js" with this "dev": "nodemon -r dotenv/config src/index.js"

My index.js file

import dotenv from "dotenv";
    import express from "express";
    const app = express();

    dotenv.config({
      path: "./.env",
    });

in the script dev line src/index.js this is the path of your index.js file.

NOW YOU CAN ABLE USE YOU .env FILE GLOBAL. THANKS;