Starting the development server

If you created a React application using the create-react-app tool in the previous chapter, then you have everything you need to launch a development server. No configuration is necessary! Let's start it up right now. First, make sure that you're in the project directory:

cd my-react-app/ 

Now you can start the development server:

npm start 

This will start the development server using the start script from the react-scripts package. You should see the console output that looks like this:

Compiled successfully!
    
You can now view my-react-app in the browser.
    
  Local:            http://localhost:3000/
  On Your Network:  http://192.168.86.101:3000/
    
Note that the development build is not optimized.
To create a production build, use npm run build. 

You'll notice that in addition to printing this output in the console...