Reading enviromental variable problem in node.js

Here is my excel.js:

    let test = async () => {

Here is my package.json fragment:

"scripts": {
    "excel": "cross-env NODE_ENV=development node ./server/excel.js",
    "test": "react-scripts test"

My .env.development is stored in the application root folder.
Here is my .env.development:


When I execute the following command line in the application root folder:

npm run excel

It should return "dbServer", unfortunately, it returns undefined.
How can I fix it?

>Solution :

Install dotenv package, and require it require('dotenv').config()

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