How I Built 1,182 Pages of Free Time Tools with Next.js 16

I'm a product designer and developer. A few months ago I decided to build a side project - a comprehensive collection of free time tools that could generate organic traffic through programmatic SEO. The result is Timerjoy — 1,182+ pages across 37 categories, all statically generated with Next.js 16. Here's how it works and what I learned. The Concept Take a category like "timers" and generate pages programmatically. A 1-minute timer, 5-minute timer, 25-minute timer - each with unique metadata, JSON-LD structured data, and actual functionality. Now multiply that across 37 categories: Timers — 1 second to 12 hours, visual, classroom, Pomodoro Breathing exercises — Box Breathing, 4-7-8, Wim Hof Fitness timers — HIIT, Tabata, Boxing rounds Chess clocks — Blitz, Rapid, Classical Sunrise/sunset — for 348 US cities Moon phases — current phase + monthly calendar 64 holiday countdowns — Christmas, Ramadan, Diwali, and more Date calculators, world clock, caf