Global edge computing platform running code on Cloudflare's network. Zero cold start, per-request pricing — the top choice for indie developers building high-performance APIs and edge applications.
The free tier only allows 10ms CPU time per request (paid: 30-50ms). Any synchronous CPU-intensive operation (large JSON parsing, array processing loops) can time out. Solutions: use queues for async processing, offload heavy compute to external APIs, or upgrade to the Unbound plan.
After writing to KV, it may take up to 60 seconds for the latest value to be globally readable. Do not use KV as a real-time database — counters, inventory management, and session storage need D1 or Durable Objects instead. Nearly every Workers newcomer hits this pitfall.
Workers run on V8 isolates, not the Node.js runtime. You cannot use fs, net, child_process, or other Node APIs. Most npm packages are also incompatible — you need to find workerd-compatible alternatives. Hono is currently the most popular framework on Workers.
100K requests/day sounds like a lot, but a single page load can trigger 5-10 API requests. If your product has 100 DAU and each visits 10 pages = 10,000 requests. It seems sufficient but add cron triggers or scraper traffic and your quota can be exhausted in hours.
D1 only reached GA in 2023-2024, and its feature set is still maturing. Complex JOINs, subqueries, and large batch writes may encounter performance bottlenecks. For serious OPC products, consider evaluating PlanetScale or Supabase as alternatives to D1.
| Cloudflare D1 Documentation | Blog | - |
