Important sidenote

Sometimes when you're debugging, you may want to find out what headers have been set in the HTTP request. One way of accomplishing this is through the get method of the request object, that can be used for getting the value of a single header. The request object also has the headers property, that contains all of the headers of

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The application did not change a whole lot. Right at the beginning of our code, we're importing express, which this time is a function that is used to create an Express application stored in the app variable:

These days, code that runs in the browser uses ES6 modules. Modules are defined with an export and included in the current file with an import.

Node.js uses CommonJS modules. The reason for this is that the Node ecosystem needed modules long before JavaScript supported them in the language specification. Currently, Node also supports the use of ES6... See more