Nodemon

Create a nodemon.js file in your project folder, and add the following configuration. 

mern-simplesetup/nodemon.js:

{
    "verbose": false,
    "watch": [ "./server" ],
    "exec": "webpack --mode=development --config 
    webpack.config.server.js 
                && node ./dist/server.generated.js"
}

This configuration will set up nodemon to watch for changes in the server files during development, then execute compile and build commands as necessary.