Cloudflare Workers

What is Cloudflare Workers?

Cloudflare Workers lets developers deploy code that runs on Cloudflare’s network in hundreds of cities rather than in a single cloud region. Instead of giving each program its own container or virtual machine, the Workers runtime runs code in V8 isolates, lightweight sandboxes created inside an existing process, so many customers’ programs can share one runtime and start without the cold-start delays of virtual machine-based serverless platforms. Developers write Workers in JavaScript, TypeScript, Python or Rust, or in other languages compiled to WebAssembly, and deploy them with Cloudflare’s Wrangler command-line tool.

A Worker can sit in front of an existing website to rewrite requests and responses, or it can be a complete application. Bindings connect code to Cloudflare’s other developer services: Workers KV for key-value data, Durable Objects for stateful coordination, D1 for SQL databases, R2 for object storage without egress fees, Queues and Workflows for background work, Hyperdrive for existing databases, and Workers AI and Vectorize for running AI models and vector search in Cloudflare’s network. Frameworks such as React, Next.js and Astro deploy to Workers, with static assets served from the Cloudflare CDN cache.

Cloudflare announced Workers in September 2017 and opened it to all customers in March 2018. It has become the base of a developer platform that Cloudflare says opened a new market for it in compute and storage, alongside security products such as Cloudflare One. In 2026 Cloudflare acquired VoidZero, the company behind the Vite build tool, and said it would rebuild its command-line workflow for building and deploying apps on top of Vite.

Key features of Cloudflare Workers

1. 01

   V8 isolate runtime

   Code runs in lightweight isolates rather than containers, allowing thousands of programs to share one runtime and start quickly without the cold starts of virtual machine-based platforms.

2. 02

   Global deployment

   A single deploy command publishes code to Cloudflare’s network, where it runs close to users in hundreds of cities without developers choosing or managing regions.

3. 03

   Multiple languages

   Workers supports JavaScript, TypeScript, Python and Rust directly, plus languages such as C, C++, Go and Kotlin compiled to WebAssembly.

4. 04

   Storage bindings

   Workers KV, Durable Objects, D1 databases, R2 object storage and Queues connect to code through bindings, giving applications state, SQL, files and messaging without separate infrastructure.

5. 05

   Workers AI and Vectorize

   Developers can run machine learning models on serverless GPUs in Cloudflare’s network and store embeddings in Vectorize for semantic search and retrieval-augmented generation.

6. 06

   Full-stack framework support

   Frameworks including React, Next.js, Svelte and Astro deploy to Workers, with static assets cached on Cloudflare’s network and server-side logic running in the same application.

7. 07

   Cron jobs and Workflows

   Cron Triggers run code on a schedule, and Workflows provide durable, multi-step processes with automatic retries for long-running background tasks.

8. 08

   Built-in observability

   Logs, metrics and traces show the performance and errors of each Worker, helping developers debug problems across a globally distributed deployment.

Who uses Cloudflare Workers?

• Developers build APIs and full-stack web applications that run close to users worldwide without provisioning servers or picking regions.
• Companies modify requests and responses in front of existing websites for authentication, redirects, A/B tests and personalization.
• AI startups run inference, retrieval and agent logic using Workers AI, Vectorize and Durable Objects on the same platform.
• Software-as-a-service providers use Workers for Platforms to let their own customers deploy custom code in isolated environments.

History of Cloudflare Workers

Cloudflare introduced Workers in September 2017 as a way to run JavaScript written in the style of browser service workers on its edge servers, letting customers customize how their traffic was handled. After a beta period, it became available to all customers in March 2018. Cloudflare then added storage and state through products such as Workers KV, Durable Objects, R2 and D1, turning Workers from a traffic-scripting tool into a platform for complete applications.

In September 2022 Cloudflare published workerd, the runtime behind Workers, as open source under the Apache 2.0 license. It launched Workers AI in 2023 to run models on GPUs across its network and has since added static asset hosting, containers and durable Workflows. In June 2026 it announced that VoidZero, whose open-source projects include Vite, Vitest, Rolldown and Oxc, was joining Cloudflare, and said those projects would remain open source.

1. 2017

   Cloudflare announces Workers, a platform for running JavaScript on its edge network.

2. 2018

   Workers becomes available to all Cloudflare customers in March.

3. 2022

   Cloudflare open-sources workerd, the JavaScript and WebAssembly runtime that powers Workers.

4. 2023

   Cloudflare launches Workers AI for running machine learning models on GPUs in its network.

5. 2026

   Cloudflare acquires VoidZero, maker of the Vite build tool, to build its developer tooling around Vite.

Cloudflare Workers pricing

Cloudflare Workers alternatives

Well-known alternativesAWS Lambda, Vercel, Netlify, Fastly Compute, Deno Deploy and Google Cloud Run

Cloudflare Workers: frequently asked questions

Sources

1. Cloudflare Workers cloudflare.com
2. How Workers works, Cloudflare Docs developers.cloudflare.com
3. Workers pricing, Cloudflare Docs developers.cloudflare.com
4. Introducing Cloudflare Workers, Cloudflare Blog blog.cloudflare.com
5. VoidZero is joining Cloudflare, Cloudflare Blog blog.cloudflare.com

Last reviewed September 17, 2026. Spotted an error? Send a correction.