Cloudflare Workers
Cloudflare workers allow you to host serverless code. The free plan is also ideal for static site hosting.
About Cloudflare Workers
Cloudflare Workers is a serverless functions platform that deploys code globally, running by default across Cloudflare's network of more than 330 cities. It supports JavaScript, TypeScript, Python, and Rust, and is built on a V8 isolate architecture rather than traditional processes or containers, which the platform states eliminates cold starts.
Billing is based on CPU execution time rather than idle time, and the platform scales automatically from zero to high request volumes without requiring pre-provisioned concurrency, load balancers, or capacity planning. A "Smart Placement" feature allows execution to be located near a workload's data source to reduce end-to-end latency. Workers also supports local development and testing through workerd, its open-source runtime.
The product is aimed at developers building APIs and other backend services that need automatic global scaling, such as handling large or variable request volumes without manual regional configuration.
Key features
- Deploy serverless functions globally across Cloudflare's 330+ cities
- No cold starts for function execution
- Automatic scaling from zero to millions of requests with infinite concurrency
- Write functions in JavaScript, TypeScript, Python, or Rust
- First-class local development and testing via workerd runtime
- Pay only for CPU execution time, not idle time
Frequently asked questions
What languages can I use with Cloudflare Workers?
You can write Workers in JavaScript, TypeScript, Python, or Rust using a template to kickstart your app.
How does pricing work?
You only pay for execution time (CPU time), not for idle time spent waiting on I/O.
Does Cloudflare Workers have cold starts?
No, Workers are designed to avoid cold starts so users aren't kept waiting.
Can I test Workers locally before deploying?
Yes, Workers supports first-class local development and testing using the open-source workerd runtime before pushing changes.
How does Workers scale under high traffic?
Workers scale automatically from zero to millions of requests with infinite concurrency, with no need to pay for pre-provisioned capacity.
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