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â–¸ 24 lines written, 0 errors

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Node.js nuggets

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Composable Request Handling with Express Middleware (Premium)

Node.js javascript

Express middleware are just functions that run in order on every request. Chain them to add logging, authentication and error handling without repeating yourself in each route.

const express = require("express");
const app = express();

// Simple request logger
app.use((req, res, next) => {
  console.log(`${req.method} ${req.url}`);
  next();
});

// Reusable auth guard
function requireAuth(req, res, next) {
  if (!req.headers.authorization) return res.status(401).json({ e...
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Processing Large Files with Node.js Streams (Premium)

Node.js javascript

Reading a whole file into a Buffer does not scale. Streams process data piece by piece and can be piped together, so you can transform gigabytes with a tiny, constant...

const fs = require("fs");
const zlib = require("zlib");
const { pipeline } = require("stream/promises");
const { Transform } = require("stream");

// Uppercase each chunk as it flows through
const upper = new Transform({
  transform(chunk, _enc, cb) {
    cb(null, chunk.toString().toUpperCase());...
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