---
description: Write Cloudflare Workers using JavaScript standards and web platform APIs.
title: JavaScript
image: https://developers.cloudflare.com/og-docs.png
---

[Skip to content](#main-content)

> Documentation Index  
> Fetch the complete documentation index at: https://developers.cloudflare.com/workers/llms.txt  
> Use this file to discover all available pages before exploring further.

# JavaScript

Last updated Aug 24, 2026|Copy as Markdown|[View as Markdown](https://mchen-ai-models-sync.previews.developers.cloudflare.com/workers/languages/javascript/index.md)|[Agent setup](https://mchen-ai-models-sync.previews.developers.cloudflare.com/agent-setup/)

The Workers platform is designed to be [JavaScript standards compliant ↗](https://ecma-international.org/publications-and-standards/standards/ecma-262/) and web-interoperable, and supports JavaScript standards, as defined by [TC39 ↗](https://tc39.es/) (ECMAScript). Wherever possible, it uses web platform APIs, so that code can be reused across client and server, as well as across [WinterCG ↗](https://wintercg.org/) JavaScript runtimes.

Refer to [Runtime APIs](https://mchen-ai-models-sync.previews.developers.cloudflare.com/workers/runtime-apis/) for more information on specific JavaScript APIs available in Workers.

### Resources

* [Getting Started](https://mchen-ai-models-sync.previews.developers.cloudflare.com/workers/get-started/guide/)
* [Quickstarts](https://mchen-ai-models-sync.previews.developers.cloudflare.com/workers/get-started/quickstarts/) – More example repos to use as a basis for your projects
* [TypeScript type definitions ↗](https://github.com/cloudflare/workers-types)
* [JavaScript and web standard APIs](https://mchen-ai-models-sync.previews.developers.cloudflare.com/workers/runtime-apis/web-standards/)
* [Tutorials](https://mchen-ai-models-sync.previews.developers.cloudflare.com/workers/tutorials/)
* [Examples](https://mchen-ai-models-sync.previews.developers.cloudflare.com/workers/examples/?languages=JavaScript)

Was this helpful?

YesNo

## On this page

[![](https://mchen-ai-models-sync.previews.developers.cloudflare.com/_astro/logo.te5VL_aD.svg)Docs](https://mchen-ai-models-sync.previews.developers.cloudflare.com/)

```json
{"@context":"https://schema.org","@type":"WebPage","@id":"https://developers.cloudflare.com/workers/languages/javascript/#page","headline":"JavaScript · Cloudflare Workers docs","description":"Write Cloudflare Workers using JavaScript standards and web platform APIs.","url":"https://developers.cloudflare.com/workers/languages/javascript/","inLanguage":"en","image":"https://developers.cloudflare.com/og-docs.png","dateModified":"2026-08-24","publisher":{"@type":"Organization","name":"Cloudflare","description":"One platform for your apps, agents, and workforce. Build, secure, and scale without managing infrastructure","url":"https://www.cloudflare.com/","sameAs":["https://github.com/cloudflare","https://www.linkedin.com/company/cloudflare","https://x.com/cloudflare"],"logo":{"@type":"ImageObject","url":"https://developers.cloudflare.com/logo.svg"},"address":{"@type":"PostalAddress","streetAddress":"101 Townsend St","addressLocality":"San Francisco","addressRegion":"CA","postalCode":"94107","addressCountry":"US"},"contactPoint":[{"@type":"ContactPoint","contactType":"Customer Support","url":"https://support.cloudflare.com/","availableLanguage":["English"]},{"@type":"ContactPoint","contactType":"Sales","url":"https://www.cloudflare.com/contact/","availableLanguage":["English"]}]},"isPartOf":{"@type":"WebSite","@id":"https://developers.cloudflare.com/#website","name":"Cloudflare Docs","url":"https://developers.cloudflare.com/"}}
```