A comprehensive, industry-standard Node.js Full Syllabus

Modern ES6+ Features: Destructuring, rest/spread operators, template literals, optional chaining, nullish coalescing.
Asynchronous JavaScript: Callbacks, callback hell, Promises, async/await, and error handling with try...catch.
Execution Context: Scope, closures, the this keyword, and the JavaScript runtime model.

Internal Architecture: V8 engine, libuv, thread pool, event loop, and non-blocking I/O.
Event Loop Phases: Timers, pending callbacks, idle/prepare, poll, check (setImmediate), and close callbacks.
Microtask Queue vs. Macrotask Queue: process.nextTick() vs. resolved Promises.
Global Objects: global, process, __dirname, __filename, and CLI execution.
Module Systems: CommonJS (require, module.exports) vs. ES Modules (import, export).

Package Management: package.json, package-lock.json, semantic versioning (^, ~), local vs. global dependencies.
Scripts & Workflows: Custom npm scripts, environment-specific runs, and npx.
Managing Secrets: Working with .env files and dotenv.

File System (fs & fs/promises): Reading, writing, appending, updating, and deleting files; sync vs. async operations.
Path Module (path): Resolving absolute/relative paths, path traversal defense, normalization.
Events (EventEmitter): Custom event creation, listening, emitting, and memory leak handling (removeListener, once).
Buffers & Streams:
- Binary data handling with Buffer.
- Stream types: Readable, Writable, Duplex, Transform.
- Handling backpressure, piping (stream.pipeline), and chunk-by-chunk processing.
OS & HTTP: os module utilities and building a bare-bones HTTP server using node:http.

Express Basics: App setup, routing, request/response cycle, URL parameters, query strings, and body parsing.
Middleware Architecture: Built-in, application-level, router-level, error-handling middleware, and third-party libraries (e.g., cors, morgan).
REST API Design: HTTP verbs, standardized status codes, versioning (/api/v1), and idempotency.
Architecture Pattern: Model-View-Controller (MVC) or Layered Architecture (Controller-Service-Repository).
Data Validation & Sanitization: Schema validation with libraries like Zod or Joi.
File Handling: Multi-part form data uploads using multer.

NoSQL (MongoDB):
- MongoDB basics, document structures, and indexing.
- Object Data Modeling (ODM) with Mongoose: Schemas, models, validations, middleware (pre/post hooks), and population. euphoriagenx.com
Relational Databases (PostgreSQL / MySQL):
- Relational schema design, transactions, and foreign keys.
- ORMs / Query Builders: Prisma, Drizzle, or TypeORM.
In-Memory Caching:
- Redis: Key-value caching, session storage, and rate limiting.

Authentication Strategies:
- Password hashing with bcrypt or argon2.
- Stateless token authentication with JSON Web Tokens (JWT).
- Stateful session-based auth with cookies (httpOnly, SameSite, Secure). ProCodrr
- OAuth 2.0 integration (e.g., Google login with Passport.js).
Authorization: Role-Based Access Control (RBAC) and permission middleware.
Backend Security:
- Setting HTTP security headers using helmet.
- Protection against SQL Injection, NoSQL Injection, XSS, CSRF, and timing attacks.
- Rate-limiting and DDoS mitigation using express-rate-limit and Redis.

WebSockets & Real-Time: Bidirectional communication, rooms, namespaces, and event broadcasting using Socket.io. SourceKode
Background Jobs & Message Queues: Offloading heavy workloads and managing cron jobs with BullMQ (Redis-backed) or node-cron. SourceKode
Email & Notifications: Sending transactional emails with nodemailer or third-party APIs (Resend, SendGrid). SourceKode

Unit & Integration Testing: Writing test suites with Jest or Vitest. SourceKode
API Testing: Testing HTTP endpoints and payloads with Supertest.
Mocking & Spying: Mocking database calls, network requests, and external third-party services.

Multi-Processing:
- cluster module for utilizing multi-core CPUs.
- child_process (fork, spawn, exec) for running separate system tasks.
- worker_threads for CPU-heavy tasks without blocking the main event loop.
Memory Management: Identifying memory leaks, profiling with Chrome DevTools/Clinic.js, and garbage collection behavior.

Process Management: Running and monitoring apps with PM2.
Containerization: Writing optimized multi-stage Dockerfile configurations and docker-compose.yml for Node, database, and Redis stacks.
Logging & Observability: Structured logging with Pino or Winston; APM and health-check endpoints.
Deployment Targets: AWS (EC2/ECS/Lambda), DigitalOcean, Render, or Railway; setting up CI/CD pipelines with GitHub Actions.

REST API with Full Auth & RBAC: Multi-tenant blog or e-commerce API with JWTs, refresh tokens, role checks, and pagination.
Real-Time Collaborative App: Chat application or collaborative document editor with Socket.io and Redis adapters.
High-Throughput File Processor: Video/image transcoding queue or CSV batch importer using streams and background worker queues.