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To utilize environment variables in the package.json script through .env, follow these steps:

1. Install the dotenv package using npm install dotenv

2. Create a .env file at the root of your project directory

3. Add the necessary environment variables to the .env file in the format KEY=VALUE

4. In your package.json file, create a script that uses the environment variables. For example:

"scripts": {
  "start": "node index.js",
  "env-example": "node -r dotenv/config index.js"
}

The "env-example" script loads the .env file using the dotenv package before running index.js.

1. Run the script using npm run env-example. The script will now have access to the environment variables defined in the .env file.