JavaScript

Express

This will be regarding the Express framework for Node.js.

Initial setup

const express = require('express');
const app = express();
app.listen(3000, () => console.log('Listening on port 3000'));

Middleware

Middleware is a function that has access to the request and response objects. It can do whatever it wants with them, and then call the next function in the middleware stack. If it doesn't call next(), then the request will be left hanging.

• Special middleware

  • express.static() - serves static files

  • express.json() - parses incoming requests with JSON payloads

  • express.urlencoded() - parses incoming requests with URL-encoded payloads

• Custom middleware