How to get env variable?

Question

JavaScript

Hello.
There is an env variable, on the command line, if you write it, echo $TEST,it displays data.
I need to get this variable for endPoint in the application in order to make requests.
Can you please tell me how to get this variable, what to use it further on the frontend?
The app uses webpack and React

Answer 1

webpack.DefinePlugin

module.exports = {
  plugins: [
    new webpack.DefinePlugin({
      __API_URL__: JSON.stringify(process.env.API_URL),
    });
  ],
};