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Server-side JavaScript — from Zero to Expert

Node.js

JavaScript & async, native modules, Express & databases, REST API, real-time, deployment.

7progressive levels
29detailed sections
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Updated on September 20, 2026

How to follow this guide?

Guide resources

0

Level 0 — Getting started

Understand Node.js, install it and run your first script.

  1. What is Node.js? (V8 engine, event-driven model)
  2. Install Node.js, npm & configure VS Code
  3. First script & Node REPL
Start level 0 →
1

Level 1 — JavaScript & Node basics

Essential modern JavaScript (ES6+) then the async that powers Node.

  1. Modern JavaScript refresher (ES6+): let/const, arrow functions, destructuring
  2. Asynchronous: callbacks, Promises, async/await
  3. Modules: CommonJS (require) vs ES Modules (import)
  4. npm & package.json: dependencies, scripts, versions
Start level 1 →
2

Level 2 — Node.js core

Native modules: file system, events, streams and HTTP server.

  1. Native modules: fs, path, os
  2. EventEmitter & event-driven programming
  3. Streams & Buffers (handling large volumes)
  4. Create a native HTTP server
Start level 2 →
3

Level 3 — Express & databases

The Express framework and data persistence (MongoDB / SQL).

  1. Express: routes, middlewares, requests/responses
  2. Template engines & static file serving
  3. MongoDB & Mongoose (NoSQL database)
  4. SQL with Node (PostgreSQL/MySQL, Prisma/Sequelize)
Start level 3 →
4

Level 4 — API, authentication & real-time

Design robust REST APIs, secure access and handle real-time.

  1. Build a complete REST API (CRUD + MVC structure)
  2. Authentication & security (JWT, bcrypt, Passport, Helmet)
  3. Real-time with WebSockets / Socket.IO
  4. Validation, error handling & testing (Jest)
Start level 4 →
5

Level 5 — Pro level & deployment

TypeScript, performance, containerization and production deployment.

  1. Node.js with TypeScript
  2. Performance, clustering & scaling
  3. Docker for Node.js
  4. Deployment & CI/CD (Render, Railway, VPS, GitHub Actions)
Start level 5 →
6

Level 6 — Hands-on & mastery

Hands-on cases, troubleshooting and production reflexes.

  1. Guided case studies
  2. Quick troubleshooting
  3. Best practices & pitfalls
  4. Checklists & templates
  5. Going further
  6. Resources & references
Start level 6 →

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