Node.js Full Stack Development Notes

Key Skills as a Full Stack Developer

  • Node.js is crucial for full stack web development.
  • Confusion about Node vs. Deno: Focus on Node for job readiness.
  • Historical context: Predictions of technology replacements rarely happen (GraphQL vs. REST, Node.js vs. PHP).

Overview of Node.js

  • Definition: Node.js is a JavaScript runtime that allows running JavaScript on a server.
  • Origin: Created in 2009 to enable server-side JavaScript execution, breaking the traditional browser limitation.
  • Revolutionizes Web Development: Developers can use a single language (JavaScript) for both front-end and back-end development.

Getting Started with Node.js

Step 1: Understanding Node.js
  • Not a programming language; a runtime environment.
  • Check for installation via command node -v.
Step 2: Installing Node.js
  • Compatible with Windows, Mac, and Linux.
  • Node Version Manager (NVM): Recommended to manage multiple versions.
  • Example commands:
    • nvm install 12.16.3
    • nvm use <version>
Step 3: Hello World in Node.js
  • REPL Mode: Type node in command line to enter Node interactive session and execute JavaScript code.
  • Run simple Node app:
  • Create index.js and write console.log('Hello, World!').
  • Execute: node index.js.
Step 4: Understanding the Node Runtime
  • Globals: console, global, process.
  • process: Accesses the Node environment and details.
  • Event-Driven Nature:
  • Uses an event loop for asynchronous operations, enhancing performance for I/O-bound tasks.
  • Events can be listened to and processed with callbacks.
Step 5: Working with Events
  • Event Handling: Use process global for exit events.
  • Custom event emitters can be created using Node's events module.
  • Example of creating and emitting custom events.
Step 6: File System Interaction
  • Built-in fs module for file operations:
  • Blocking vs Non-Blocking: readFileSync (blocking) vs readFile (non-blocking).
  • Example code to read files using callbacks and promises.
  • Async/Await Syntax: Simplifies handling of asynchronous operations.
Step 7: Understanding Modules
  • Modules: JavaScript files that export functions or objects.
  • require function: Commonly used for importing modules.
  • npm (Node Package Manager): For managing dependencies of Node.js projects.
  • Create a package.json using npm init, install packages (e.g., express) with npm install.

Building a Full Stack Application

  • Use Express for handling HTTP requests.
  • Endpoints:
  • Define routes using app.get(), which responds to GET requests.
  • Serve HTML content by reading from the file system and sending responses.
  • Handle server errors and log output for user information.

Deploying Node.js Applications

  • Deployment: Recommended to use Google App Engine for Node.js apps.
  • Create app.yaml for runtime configuration.
  • Define a start script in package.json for the server.
  • Deploy via gcloud app deploy and obtain a public URL for cloud access.

Conclusion

  • This introductory overview equips you with essential Node.js knowledge and practical application-building skills.
  • For deeper learning, consider accessing advanced courses and resources.