Node.js Must Know

This branch is the main Node.js path.

Focus on runtime behavior before jumping to Express.

Topics here

• What Node.js is.
• Node.js vs browser JavaScript.
• Event loop, libuv, microtasks, macrotasks, and non-blocking IO.
• Modules and npm.
• File system and path.
• Events and EventEmitter.
• Streams and buffers.
• HTTP server.
• Environment variables and process.
• Error handling.

Practice rule

Before Express, build one tiny HTTP server with Node's http module. It makes Express routing and middleware easier to understand.