> For the complete documentation index, see [llms.txt](https://book.ferro.pro/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://book.ferro.pro/cloud/cf_dev.md).

# cf\_dev

* [Free Lmits](#free-lmits)
* [Worker](#worker)
  * [py](#py)
  * [js](#js)

## Free Lmits

<https://developers.cloudflare.com/workers/platform/limits/>

* CPU time per HTTP request 10 ms

## Worker

<https://developers.cloudflare.com/workers/languages/>

* JavaScript + TypeScript
* Python Workers
* Rust

### py

<https://developers.cloudflare.com/workers/languages/python/>

* beta @ 2026 March

### js

<https://developers.cloudflare.com/workers/tutorials/build-a-qr-code-generator/>

```
npm create cloudflare@latest -- qr-code-generator

npx wrangler deploy
```