Cloudflare Workers
By Cloudflare
Cloudflare Workers is a serverless edge compute platform that runs JavaScript, TypeScript, and other languages compiled to WebAssembly directly on Cloudflare's global network, executing code close to end users with very low cold-start…
Definition
Cloudflare Workers is a serverless edge compute platform that runs JavaScript, TypeScript, and other languages compiled to WebAssembly directly on Cloudflare's global network, executing code close to end users with very low cold-start latency.
Overview
Unlike traditional serverless platforms such as AWS Lambda that run functions in one or a handful of regions, Cloudflare Workers executes code across Cloudflare's hundreds of edge data centers, so a request is typically handled by the point of presence physically closest to the user. This is a form of edge computing: logic runs near the network edge rather than in a centralized cloud region. The performance characteristics come from its execution model. Instead of spinning up a container or virtual machine per function, Workers uses lightweight V8 isolates — the same sandboxing technology inside the V8 engine that powers Chrome and Node.js — which start in milliseconds and let a single machine run thousands of isolated workloads with minimal overhead. This largely eliminates the cold-start delays associated with container- or VM-based serverless platforms. Workers integrates with a broader ecosystem of Cloudflare edge storage and messaging primitives — including key-value storage, Durable Objects for stateful coordination, and queues — and pairs naturally with Cloudflare Pages for full-stack applications. Common use cases include API gateways, authentication and request-transformation middleware, A/B testing logic, and lightweight backend APIs that benefit from running close to users worldwide.
Key Features
- V8 isolate-based execution instead of containers or virtual machines
- Runs across Cloudflare's global edge network, not a single region
- Near-instant cold starts compared to traditional container-based serverless
- Support for JavaScript, TypeScript, Rust, and other Wasm-targeting languages
- Integrated key-value storage, Durable Objects, and queues
- Tight integration with Cloudflare Pages for full-stack applications
- Usage-based pricing built around requests and CPU time
- Built-in access to Cloudflare's network-level security features