Cloudflare Workers
The Network is the ComputerTM
Build serverless applications on Cloudflare's global cloud network of 155 data centers. Cloudflare Workers provides a lightweight JavaScript execution environment that allows developers to augment existing applications or create entirely new ones without configuring or maintaining infrastructure.
Already a customer? Activate Today
Chief Technology Officer at npm
Why go serverless?
Building and maintaining applications that easily scale to support spikes in demand or a global user base has generally required a large amount of both upfront engineering work and ongoing operational support. Developers were forced to spend significant time on writing supporting code rather than building the application itself. With Cloudflare Workers developers can build serverless applications that scale without needing to spend time and effort on infrastructure or operations.
Infrastructure Lead at Postmates
Building serverless applications with Cloudflare Workers
Cloudflare Workers lets developers deploy serverless JavaScript applications on Cloudflare's global cloud network, where they are seamlessly scalable and closer to end users. Built on top of the Service Workers API, Workers receive events for every HTTP(S) request made to an application. Workers then run application logic and can make subsequent requests to the Cloudflare Cache, Cloudflare Workers KV, or an application origin to return data to the user. The location of Workers on Cloudflare's global cloud network creates the following use cases for serverless:
Deliver personalized user experiences
Cache and modify lightweight static HTML pages while incorporating dynamic content based on user location, device type or time of day using the Cache API. Build responses from multiple background service requests either to the Cloudflare cache, application origin, or third party APIs.
Increase API responsiveness
Create a flexible API gateway to aggregate responses from multiple endpoints and return as a single response, eliminating the need for each endpoint to compile individual responses. Each request can also be split into multiple parallel requests then combined into a single response.
Implement custom application security
Build conditional responses for inbound requests that can assess and subsequently block or reroute malicious or unauthorized requests. Set parameters that can identify and authorize legitimate application traffic.
addEventListener('fetch', event => {
event.respondWith(fetchAndApply(event.request))
})
async function fetchAndApply(request) {
if (request.headers.get('user-agent').includes('annoying_robot')) {
return new Response('Sorry, this page is not available.',
{ status: 403, statusText: 'Forbidden' })
}
return fetch(request)
}
Improve A/B testing performance
Enable randomized page selection by intercepting inbound HTTP(S) requests and serving content requests from the Cloudflare cache to specific control and test groups.
Other Ways to Write and Sell Workers
Cloudflare Apps with Workers
Cloudflare Apps allow developers to extend the functionality of websites. When listed in the Cloudflare Marketplace Apps can be installed on more than 8 million internet websites, applications and APIs.
Interested in being one of the first to write an App that uses Workers?
Cloudflare Workers Partners
While many Cloudflare customers write Cloudflare Workers themselves, sometimes it helps to have a dedicated expert on hand. Cloudflare partners with 3rd party JavaScript experts to help our customers achieve more with Workers solutions customized to their needs.
Interested in writing Workers for others?
Key Features
High-performance V8 JavaScript Engine
Based on the web standard Service Workers API
Securely sandboxed
Prescripted deployment recipes
Apply custom logic expressions for routing and caching at the edge
Fast startup times at all locations
Deployed to 155 Cloudflare data centers within minutes
Fast key-value storage with Cloudflare Workers KV
Workers WebAssembly Support
Senior System Administrator at MaxMind
Everyone can start using Cloudflare Workers
Cloudflare protects and accelerates Internet applications and APIs. To start using Cloudflare Workers, you'll need a Cloudflare plan and an active Workers subscription.
Activate Today Already a customer?
Workers for Cloudflare's Free Plan
+ $5/Month
First 10M requests free;
$.50 per million thereafter
< 5ms CPU Processor Time
1 Script Included
Workers for Cloudflare's Pro Plan
+ $5/Month
First 10M requests free;
$.50 per million thereafter
< 10ms CPU Processor Time
1 Script Included
Workers for Cloudflare's Business Plan
+ $5/Month
First 10M requests free;
$.50 per million thereafter
< 50ms CPU Processor Time
1 Script Included
Workers for Cloudflare's Enterprise Plan
Custom
Custom Pricing
Negotiable CPU Processor Time
Unlimited Scripts Included