Node.js & Express Tutorial

Learn what Node.js is, where it runs, and why JavaScript developers use it for servers and tools.

Compare Node.js and browser JavaScript so you know which APIs exist in each environment.

Install a modern Node.js version, check npm, and understand common version choices.

Create a JavaScript file, run it with Node, and read command-line arguments.

Use the Node REPL for quick experiments and npm scripts for repeatable project commands.

Learn the classic Node module system using require and module.exports.

Learn modern JavaScript modules in Node.js using import and export.

Understand npm, install packages, and distinguish dependencies from development dependencies.

Learn the important fields in package.json and how they shape a Node.js project.

Meet the built-in Node.js modules you will use before reaching for npm packages.

Read and write files with Node.js using the fs module and promise-based APIs.

Use Node path and URL helpers to safely build paths and parse web addresses.

Understand event-driven code and use EventEmitter for simple Node.js events.

Build a small HTTP server using Node.js before learning Express.

Learn what Express adds to Node.js and when to use it for backend apps.

Install Express, create a server, and respond to your first routes.

Understand Express routes and the common HTTP methods used in APIs.

Read dynamic path values with req.params and optional URL filters with req.query.

Accept JSON request bodies in Express and validate basic input before creating data.

Learn how Express middleware runs between the request and the final route response.

Use express.static to serve images, CSS, JavaScript, and simple public files.

Organize related Express routes into smaller router modules.

Return helpful error responses and add a basic Express error-handling middleware.

Configure ports with environment variables and restart your app automatically during development.

Put beginner Node.js and Express ideas together by building a small in-memory Notes API.

Design predictable Express APIs with resources, HTTP methods, status codes, JSON responses, and consistent error shapes.

Split Express routes into routers and controllers so APIs stay readable as features grow.

Move business logic out of controllers and into services that can be reused and tested without HTTP.

Validate request bodies, params, and query strings manually or with schema-style libraries before data reaches your services.

Handle rejected promises in Express routes and centralize API errors with async wrappers and error middleware.

Use signed JSON Web Tokens to authenticate API requests while keeping secrets in environment variables.

Understand refresh-token and session tradeoffs for keeping users logged in safely.

Store passwords safely with bcrypt hashes, never plaintext or fast general-purpose hashes.

Use secure HTTP headers and deliberate CORS rules so browsers interact with your API safely.

Protect login, signup, and public API endpoints from abuse with rate limiting strategies.

Connect Express to MongoDB using the official Node driver, ObjectId, indexes, and shared clients.

Use Mongoose schemas, models, validation, and queries when you want a structured MongoDB object model.

Query PostgreSQL from Express with pg pools, parameterized queries, transactions, and a Prisma-style workflow overview.

Treat database schema changes and seed data as versioned application changes, not manual dashboard work.

Accept file uploads in Express while validating file type, size, storage location, and public access.

Send transactional email from Express through a provider while keeping SMTP credentials and API keys out of source code.

Build list endpoints that support predictable pagination, safe filters, and controlled sort options.

Log useful request and application events without leaking secrets or overwhelming production systems.

Test Express routes, services, middleware, and error responses with focused unit and integration tests.

Document Express APIs as contracts using examples, schemas, response codes, and OpenAPI-style descriptions.

Add TypeScript to Express for typed requests, responses, services, and environment configuration.

Load configuration from the environment, validate it at startup, and keep deploy-specific values out of code.

Prepare Express APIs for production with start scripts, health checks, proxies, environment variables, and graceful shutdown.

Organize Express applications into predictable modules that can grow without becoming a single giant server file.

Build a clean Express flow where validation, controllers, services, repositories, and errors each have one job.

Understand event loop health, slow routes, payload size, streaming, clustering, and the habits that make Node services reliable under load.

Use Redis with Express for cache-aside reads, invalidation, TTLs, rate limiting, and safe production caching decisions.

Move slow work out of Express requests with queue-based workers, retries, idempotency, and safe job status APIs.

Add realtime behavior to an Express application using an HTTP server, Socket.IO-style events, rooms, authentication, and scaling rules.

Harden production Express APIs with secure headers, CORS, rate limits, input limits, tokens, authorization, and dependency hygiene.

Make Express production-ready with structured logs, request IDs, metrics, readiness checks, and useful error context.

Package an Express app in Docker with small images, environment variables, health checks, compose files, and production-friendly commands.

Build a complete Express REST API with folder structure, validation, controllers, services, in-memory data, errors, and pagination.

Build an Express authentication API with registration, login, password hashing, JWT access tokens, protected routes, and safe responses.

Build a followable Express and Socket.IO shell for rooms, chat messages, notifications, and a tiny browser client.

Recognize the mistakes that make Express apps fragile, slow, insecure, or hard to maintain, and learn practical fixes.

Compare Express with NestJS, Fastify, tRPC, and other backend tools so you can choose the right framework for the project.

Turn Node and Express skills into portfolio projects that show architecture, production thinking, tests, and deployment ability.

Connect Express APIs to Next.js frontends with environment variables, cookies, CORS, server-side fetching, and deployment boundaries.

Choose the next backend skills after Express: databases, TypeScript depth, testing, cloud, architecture, security, and distributed systems.