Writing configurable middleware functions

A common pattern for writing middleware functions is to wrap the middleware function inside another function. The result of doing so is a configurable middleware function. They are also higher-order functions, that is, a function that returns another function.

const fn = (options) => (response, request, next) => {  
    next()  
} 

Usually an object is used as an options parameters. However, there is nothing stopping you from doing it in your own way.

Getting ready

In this recipe, you will write a configurable logger middleware function. Before you start, create a new package.json file with the following content:

{ 
    "dependencies": { 
        "express&quot...