Code Explainers

Express code explainers

javascript 
const asyncHandler = (fn) => (req, res, next) => {
  Promise.resolve(fn(req, res, next)).catch(next);
};
 

Async error handling in Express routes

async-await error-handling middleware
Intermediate 7 steps
javascript 
const express = require('express');
const Stripe = require('stripe');
 
const stripe = new Stripe(process.env.STRIPE_SECRET_KEY);

Verifying Stripe webhooks in Express

webhooks signature-verification raw-body
Intermediate 7 steps
javascript 
const express = require('express');
 
const v1 = express.Router();
 

Versioning an API with Express Routers

api versioning routing modularity
Intermediate 10 steps
javascript 
const RATE_LIMIT = 100;
const WINDOW_MS = 60 * 1000;
const BLOCK_MS = 5 * 60 * 1000;
 

Building a rate-limiting middleware in Express

rate-limiting middleware closures
Intermediate 9 steps
javascript 
const fs = require('fs');
const path = require('path');
 
router.get('/downloads/:name', (req, res, next) => {

Streaming file downloads in Express

streaming backpressure file-download
Advanced 9 steps