Serverless Computing with Cloudflare Workers®
The Network is the Computer®
Build serverless applications on Cloudflare's global cloud network of data centers in over 194 cities across 90 countries. 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.
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Co-founder and Chief Data 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. Based on 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.
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 194 Cloudflare data centers within seconds
Fast key-value storage with Cloudflare Workers KV
Workers WebAssembly Support
Senior System Administrator at MaxMind
Everyone can start using Cloudflare Workers
To start using Cloudflare Workers either sign up for a workers.dev subdomain or use a domain attached to an existing Cloudflare plan.
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Cloudflare Workers Free Tier
Free
100k requests per day (UTC+0)
Deploy up to 30 scripts
Runs on all 194 data centers
Free workers.dev subdomain
< 10ms CPU time per request
Lowest latency after first request
Cloudflare Workers Unlimited Tier
$0.5/million requests
(Minimum charge of $5/mo)
Deploy up to 30 scripts
Runs on all 194 data centers
Free workers.dev subdomain
< 50ms CPU time per request
Always lowest latency
Workers KV Support
Cloudflare Workers Enterprise Tier
Custom
Annual billing available
Custom number of scripts
Runs on all 194 data centers
Free workers.dev subdomain
Negotiable CPU time limits
Always lowest latency
Workers KV Support
