Instructor: We'll change the port that this server is using. We'll use process.env for environment, and we'll create a new variable called port. If the port environment variable is not defined, we'll still use 8888 as a default.
If you run this server, we see that the server is running on port 8888. If we do a next port and we set the port into our operating system to say 3000 and we run this server again, we can see that the server is now running on port 3000.
If we open our browser, we go to localhost:8888, it can't be reached. If we go to 3000, we're getting a 404 in this case. If we go to 3000/status, we are getting the server time.
That's how you set the port inside an environment variable.