Robust Routing
•Middleware Stack
•Extensible
Routing & Methods
Building RESTful APIs with Express routing system, handling different HTTP methods and route parameters.
GETPOSTPUTDELETERoute ParamsQuery Strings
Middleware
Understanding the middleware pattern - the heart of Express for request/response processing pipeline.
app.use()next()Error HandlingBody ParserCORSMorgan
Request & Response
Working with req and res objects to handle incoming data and send appropriate responses.
req.bodyreq.paramsres.json()res.status()HeadersCookies
Authentication
Implementing secure authentication with JWT tokens, sessions, and passport.js strategies.
JWTSessionsPassport.jsOAuthbcryptProtected Routes
Database Integration
Connecting Express with databases using ORMs and ODMs for data persistence.
MongooseSequelizePrismaConnection PoolingMigrationsModels
Error Handling
Implementing robust error handling strategies for production-ready applications.
try-catchError MiddlewareHTTP ErrorsValidationLoggingAsync Errors
Quick Example
const express = require('express');
const app = express();
// Middleware
app.use(express.json());
// Routes
app.get('/api/users', (req, res) => {
res.json({ users: ['John', 'Jane', 'Bob'] });
});
app.post('/api/users', (req, res) => {
const { name } = req.body;
res.status(201).json({ message: `User ${name} created!` });
});
// Error handling middleware
app.use((err, req, res, next) => {
res.status(500).json({ error: err.message });
});
app.listen(3000, () => console.log('🚀 Express server running!'));