ExpressJs

Express.js is a minimal and flexible Node.js web framework used to build web applications and REST APIs. It simplifies server-side development with routing, middleware, and a set of handy HTTP utilities. - Built on top of Node.js for fast, scalable server-side development. - Makes routing and middleware handling straightforward. - Works well for REST APIs, real-time apps, and single-page application backends. - Stays lightweight so you can structure your project however you like. This notebook walks through Express.js from the basics — installation, project structure, and your first server — through routing, middleware, request/response objects, error handling, authentication, and database integration.

Express Basic

Introduction to Express Node vs Express Installation and First Application Structure my Application Separate App and Server Unique features of Express

Functions

Express express.json() Function express.Router() Function express.static() Function express.urlencoded() Function express.raw() Function Express.js express.text() Function express() function Complete Reference

HTTP Request and Response

HTTP request and response cycle req.body req.params req.query res.send()res.json()res.status()

Request Objects

req.app Property req.baseUrl Property req.body Property req.cookies Property req.fresh Property req.accepts() Function req.acceptsCharsets() Function req.acceptsEncodings() Function req.acceptsLanguages() Function Request Complete Reference

Response Objects

res.app Property res.headersSent Property res.locals Property res.append() Function res.attachment() Function res.cookie() Function res.clearCookie() Function res.download() Function res.end() Function Response Complete Reference

Application Objects

app.locals Property app.mountpath Property Mount Event app.enable() Function app.disable() Function app.enabled() Function app.disabled() Function app.all() Function app.delete() Function Application Complete Reference

Routing & REST APIs

Express HTTP methods Create routes using Express and Postman router.METHOD() Function router.route() Function router.use() Function router.all() Function router.param() function Router Complete Reference

Middleware

Middlewares in Express Use of next() function How to create custom middleware in express Express-session middleware in Express Express Error Handling

Authentication and Authorization

REST API using the Express to perform CRUD Implement JWT authentication in Express app 1-Minute Session Expiry in Express.js

Advance Concepts

What is Express Generator?Express in Enterprise Development

Database Integration

Database Integration in Express Update record in Cassandra using Express

Express.js For Interview

ExpressJS Interview Questions and Answers