Important Points in Node.js

Important Points in Node.js — a practical guide to Node.js important concepts with clear examples you can reuse in real projects.

Important Points in Node.js — 6/55 in the Node.js series. Full playlist companion: Node.js complete course on YouTube. Prefer one article? Read the complete Node.js tutorial.

Short description

Node.js is single-threaded for your JS code, but handles many concurrent I/O operations through the event loop and libuv. Prefer non-blocking APIs for scalable servers.

Steps

1. Avoid blocking the event loop with heavy sync work.
2. Use modules to organize code.
3. Rely on npm packages instead of reinventing common tools.

Non-blocking vs blocking mindset

// Prefer async I/O
const fs = require('fs');
fs.readFile('data.txt', 'utf8', (err, data) => {
  if (err) throw err;
  console.log(data);
});