Express

Testing Node.js APIs and Express Routes

Learn how to test Express routes and Node.js API handlers with Jest and supertest, including mocking databases, external calls, and error-handling middleware.

Common Node.js & Express Pitfalls

Real-world mistakes developers make with Node.js and Express, why they're harmful, and how to fix them.

CRUD Operations in Express

Build complete Create, Read, Update, and Delete route handlers in Express using a database model.

Data Validation in Express

Validate incoming request data in Express using schema-based validation before it reaches your database layer.

Error Handling in Express

Master synchronous and asynchronous error handling in Express using 4-argument error middleware.

Express Application Structure

Learn how to organize a growing Express project into routes, controllers, middleware, and config folders.

Common Express Interview Questions

Frequently asked Express.js interview questions covering middleware, routing, and error handling, with accurate answers.

Handling JSON Requests in Express

Learn how to parse incoming JSON payloads in Express using the built-in express.json() middleware.

Introduction to Express

Learn what Express is, why it exists on top of Node's http module, and how to create your first Express server.

Middleware in Express

Master the Express middleware chain, the next() function, and the special error-handling middleware signature.

Request and Response Objects in Express

Explore the key properties and methods of Express's req and res objects used to read requests and craft responses.

Routing in Express

Understand how Express matches HTTP methods and URL paths to handler functions using routes.

Securing Express Apps (Helmet, CORS, Rate Limiting)

Harden Express applications with secure HTTP headers, controlled cross-origin access, and rate limiting to mitigate common attacks.

HTTP Status Codes Cheat Sheet

A complete reference of 2xx, 3xx, 4xx, and 5xx HTTP status codes with correct meanings and example server-side usage.