Business Days Between Dates in JS, With Holidays
Count business days between two dates in JavaScript with real public holidays. Five bugs we hit, including one in our own API, and code that avoids them.
JavaScript
10 posts tagged JavaScript.
Generate Barcodes in Node.js with an API
Generate Code 128 and Code 39 barcodes in Node.js with one POST request. Working Express code, real API responses, and a GitHub repo you can clone.
PDF Generation API: Invoices, Reports, Documents
Generate PDFs from HTML or Markdown. Perfect for invoices, receipts, reports, and any document you need to create programmatically.
QR Codes: More Useful Than You Think
URLs, WiFi passwords, contact cards, payment links—QR codes do more than you'd expect. Here's how to generate and read them programmatically.
API Caching: The Cheapest Performance Win
Every duplicate API call is wasted money. Here's how to cache responses properly—and when not to.
Add Daily Horoscopes to Your App in 5 Minutes
Build a horoscope feature your users will actually check daily. Working code included.
Email Validation That Actually Works
That regex you found on Stack Overflow is wrong. Here's how to validate emails properly—and why it matters more than you think.
Multi-Currency E-commerce: Stop Losing Sales
Showing prices in local currency increases conversions 20-40%. Here's how to implement multi-currency pricing that actually works.
Weather APIs: Build a Dashboard That's Actually Useful
Current conditions, forecasts, air quality, sunrise times—here's how to build a weather dashboard users will love.
Chuck Norris Jokes API: Add Random Facts to Any App
Add Chuck Norris jokes to your app in under 5 minutes. Real code examples for Slack bots, Discord bots, and loading screens.