29
EXPRESS JS MIDDLEWARE
According to wikiperdia,
Middleware is a type of computer software that provides services to software applications beyond those available from the operating system. It can be described as "software glue".
In our case, express js middleware is a functionality that runs between a request to the server and the response from the server.
Middleware installed via npm
Created by you - the developer - for a project.
const express = require('express');
//Start express app.
const app = expree();
//Apply a single middleware
app.use(middleware);
//Apply multiple middleware
app.use(middleware1, middleware2);
//Or via an array
const middlewareArr = [middleware1, middleware2];
app.use(middlewareArr);//Apply a single middleware
app.get('/', middleware, (res, req) => {};
//Apply multiple middleware
app.get('/', middleware1, middleware2, (res, req) => {};
//Or via an array
const middlewareArr = [middleware1, middleware2];
app.get('/', middlewareArr, (res, req) => {};29