![]() To ensure you have them installed, you can run:Ĭonst express = require ( ' express ' ) const app = express () app. There are a few things you will need installed to create, use, and test Express middleware. ![]() In this article I’ll explain what middleware is, why you would use it, how to use existing Express middleware, and how to write your own middleware for Express. This “chaining” of middleware allows you to compartmentalize your code and create reusable middleware. Additionally, middleware can either terminate the HTTP request or pass it on to another middleware function using next (more on that soon). In fact, Express itself is compromised wholly of middleware functions. Each middleware has access to the HTTP request and response for each route (or path) it’s attached to. Express middleware are functions that execute during the lifecycle of a request to the Express server. Middleware literally means anything you put in the middle of one layer of the software and another. To understand Express, you need to understand Express Middleware. Express is a minimalist, “unopinionated” server library and has become the de facto standard for building web apps in Node. While you can create a server in Node without using a library, it doesn’t give you a lot out of the box and can be quite cumbersome to add functionality. If you’ve done any significant Node development in the past seven or eight years, you’ve probably used Express to build a web server at some point.
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