🚀 Launch Special: $29/mo for life --d --h --m --s Claim Your Price →
Frameworks Free

NodeJS Fundamentals

The course teaches JavaScript developers the core concepts of Node.js, covering runtime architecture, module system, asynchronous programming, core modules, and Express.js basics, enabling them to build server‑side applications efficiently.

Who Should Take This

It is ideal for front‑end engineers, full‑stack developers, or recent graduates who are comfortable with JavaScript and want to transition to backend development. Learners should have basic programming experience and aim to understand Node.js internals, write non‑blocking code, and create simple REST APIs with Express.

What's Included in AccelaStudy® AI

Adaptive Knowledge Graph
Practice Questions
Lesson Modules
Console Simulator Labs
Exam Tips & Strategy
20 Activity Formats

Course Outline

61 learning goals
1 Runtime Architecture
3 topics

Event Loop and Execution Model

  • Describe Node.js single-threaded event loop architecture including the call stack, callback queue, and microtask queue and explain how non-blocking I/O enables concurrency
  • Explain the phases of the Node.js event loop including timers, pending callbacks, poll, check, and close callbacks and describe how setImmediate differs from setTimeout
  • Analyze how blocking operations such as synchronous file reads and CPU-intensive computations affect event loop throughput and evaluate strategies to avoid blocking

Global Objects and Process

  • Identify Node.js global objects including global, process, __dirname, __filename, console, and setTimeout and describe how they differ from browser globals
  • Implement environment variable access using process.env for configuration management and explain the role of .env files with the dotenv package
  • Implement process event handlers for uncaughtException, unhandledRejection, and exit events to manage graceful shutdown and error reporting

Timers and Scheduling

  • Describe Node.js timer functions including setTimeout, setInterval, setImmediate, and process.nextTick and explain their execution priority within the event loop phases
  • Implement timer-based patterns including debouncing, throttling, and polling intervals with proper cleanup using clearTimeout and clearInterval to prevent memory leaks
  • Analyze the difference between process.nextTick and setImmediate in terms of event loop scheduling and evaluate how microtask starvation can occur with recursive nextTick calls
2 Module System
4 topics

CommonJS Modules

  • Describe the CommonJS module system including require(), module.exports, and exports and explain how Node.js resolves module paths from node_modules and relative paths
  • Implement module creation and consumption using module.exports for single exports and exports object for named exports with proper require statements
  • Analyze CommonJS module caching behavior and evaluate how circular dependencies are resolved through partial module loading

ES Modules

  • Describe ES module syntax including import/export statements, default exports, named exports, and the role of the type field in package.json for enabling ESM
  • Implement ES module patterns including named imports with destructuring, default imports, namespace imports, and dynamic import() for conditional module loading
  • Compare CommonJS and ES modules in terms of loading behavior, static analysis capabilities, tree-shaking support, and interoperability challenges when mixing both systems

NPM Package Management

  • Describe the npm ecosystem including package.json fields such as dependencies, devDependencies, scripts, and semantic versioning rules for version ranges
  • Implement npm workflow commands including init, install, update, uninstall, and run scripts for project setup and build automation
  • Analyze the role of package-lock.json in ensuring reproducible installations and evaluate strategies for managing dependency vulnerabilities with npm audit

Built-in Utilities

  • Implement util.promisify to convert callback-based functions into Promise-returning functions for integration with async/await patterns in legacy codebases
  • Implement Node.js debugging techniques including console methods (log, error, table, time), the --inspect flag with Chrome DevTools, and the debugger statement for breakpoint debugging
3 Asynchronous Programming
4 topics

Callbacks and Promises

  • Describe the error-first callback convention in Node.js and explain how callback-based APIs signal success and failure through the first argument pattern
  • Implement Promise-based asynchronous code using Promise constructors, then/catch chains, and Promise.all, Promise.race, and Promise.allSettled for concurrent operations
  • Analyze callback hell patterns and evaluate how Promises flatten nested callback chains to improve code readability and error propagation

Async/Await

  • Implement async functions with await expressions to write asynchronous code that reads like synchronous code with proper try-catch error handling
  • Implement parallel async operations using Promise.all with await to execute independent operations concurrently rather than sequentially
  • Analyze common async/await pitfalls including unhandled promise rejections, sequential await in loops versus parallel execution, and top-level await usage in ES modules

Error Handling Patterns

  • Describe the difference between operational errors and programmer errors in Node.js and explain appropriate handling strategies for each category
  • Implement centralized error handling using custom Error subclasses with error codes, HTTP status mappings, and structured error response formatting
  • Evaluate error propagation strategies across async boundaries and analyze how unhandled rejections affect application stability in production environments

Event Emitter Pattern

  • Describe the EventEmitter class and explain how the observer pattern enables loosely coupled communication between Node.js components through named events
  • Implement custom EventEmitter subclasses with on, emit, once, and removeListener methods for event-driven communication in modular application components
  • Analyze memory leak risks from EventEmitter listeners including the maxListeners warning and evaluate strategies for proper listener cleanup in long-running applications
4 Core Modules
5 topics

File System Module

  • Describe the fs module's synchronous and asynchronous API variants including callback-based, Promise-based (fs/promises), and synchronous methods
  • Implement file operations using fs/promises including readFile, writeFile, appendFile, mkdir, readdir, stat, and unlink with proper error handling
  • Implement directory traversal and file watching using fs.watch and recursive readdir to monitor file system changes in development tooling scenarios

Path Module

  • Implement cross-platform file path construction using path.join, path.resolve, path.basename, path.dirname, and path.extname for reliable path manipulation
  • Analyze the difference between path.join and path.resolve and evaluate when to use relative versus absolute path construction for cross-platform compatibility

Streams and Buffers

  • Describe the four types of Node.js streams including Readable, Writable, Duplex, and Transform and explain how streams process data in chunks rather than loading entire content into memory
  • Implement file copying and transformation using readable and writable streams with the pipe method and the pipeline utility for proper error propagation
  • Describe Buffer objects for handling binary data and explain how to create, read, write, and convert Buffers between different encodings including UTF-8 and Base64
  • Analyze the memory efficiency advantages of stream processing versus buffering entire files and evaluate appropriate scenarios for each approach based on data size

HTTP Module

  • Implement a basic HTTP server using http.createServer that handles incoming requests, parses URLs, and sends responses with appropriate status codes and headers
  • Implement request body parsing for JSON and URL-encoded form data by collecting stream chunks and parsing the complete body in the request end event
  • Evaluate the limitations of the raw http module for building web applications and analyze why frameworks like Express are preferred for routing, middleware, and request parsing

URL and Query String Modules

  • Implement URL parsing and construction using the WHATWG URL API including hostname, pathname, searchParams, and hash for standards-compliant URL manipulation
  • Implement query string serialization and parsing using URLSearchParams for building and deconstructing URL query parameters in HTTP client and server scenarios
5 Express.js Fundamentals
5 topics

Routing

  • Describe Express routing including HTTP method handlers (get, post, put, delete), route parameters, query strings, and the request-response cycle
  • Implement RESTful route handlers with route parameters, query string parsing, request body access, and appropriate HTTP status code responses
  • Implement Express Router to organize routes into modular files with route prefixes and compose them into the main application for clean code organization

Middleware

  • Describe the Express middleware chain including the req, res, and next function pattern and explain how middleware executes in registration order
  • Implement application-level middleware for request logging, CORS headers, body parsing with express.json(), and static file serving with express.static()
  • Implement custom middleware functions for authentication token verification, request validation, and rate limiting that can be applied globally or per-route
  • Analyze middleware ordering dependencies and evaluate how incorrect middleware placement affects request processing including authentication bypass scenarios

Error Handling in Express

  • Implement Express error-handling middleware with the four-parameter signature (err, req, res, next) to catch and format errors into consistent JSON error responses
  • Implement async error handling in Express routes using try-catch wrappers or async handler utilities to ensure rejected promises are caught by error middleware
  • Evaluate strategies for structured error responses including error codes, user-facing messages versus internal details, and environment-specific error verbosity in development versus production

REST API Design with Express

  • Implement a CRUD REST API with Express including proper HTTP methods, status codes, request validation, and JSON response formatting for a resource entity
  • Analyze RESTful API design principles including resource naming conventions, HTTP method semantics, idempotency, and proper status code usage for success and error responses

Template Engines and Static Files

  • Implement Express static file serving using express.static middleware with virtual path prefixes and cache control headers for client-side asset delivery
  • Implement server-side HTML rendering using EJS or Pug template engines with Express res.render and explain how template variables are passed from routes to views
  • Analyze the trade-offs between server-side rendering with template engines and client-side rendering with SPAs in terms of SEO, initial load time, and development complexity

Scope

Included Topics

  • Node.js runtime architecture including the event loop, single-threaded execution model, non-blocking I/O, modules (CommonJS and ESM), the fs and path core modules, http server creation, streams, buffers, and the process global object
  • Express.js fundamentals including routing, middleware chain, request/response handling, static file serving, error handling middleware, and REST API endpoint creation
  • Asynchronous programming patterns including callbacks, Promises, async/await, npm package management, environment variables with process.env, and structured error handling strategies

Not Covered

  • Deno, Bun, and alternative JavaScript runtimes
  • Frontend frameworks and client-side JavaScript bundling
  • Database drivers and ORMs (Sequelize, Prisma, Mongoose)
  • WebSocket and real-time communication libraries (Socket.io)
  • Deployment, containerization, and process managers (PM2)

Ready to master NodeJS Fundamentals?

Adaptive learning that maps your knowledge and closes your gaps.

Subscribe to Access