Run WebAssembly at the edge on Fastly's global CDN with very fast cold starts and a Viceroy local dev environment.
Fastly Compute is an edge computing platform that executes WebAssembly modules across Fastly's global network, with sub-millisecond cold starts that are consistently fast across regions. Developers write handlers in Rust, JavaScript, Go, or any WASI-compatible language and deploy them with the Fastly CLI. The platform provides a local development environment called Viceroy that runs the same Wasm runtime as production, eliminating environment drift. Fastly Compute is used in production for edge-side request routing, authentication, A/B testing, and response transformation, and is paired with the open-source js-compute-runtime JavaScript SDK.
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