workerd
An open-source JavaScript and WebAssembly runtime released by Cloudflare in 2022. It serves as the core engine powering the Cloudflare Workers production environment. Built on the V8 engine, workerd provides native multi-tenant isolation by executing each request within an independent V8 Isolate.
Timeline (last 90 days)
Cloudflare acquired Deno, with the goal of building on celld to make self-hosting workerd a first-class supported way to build and run applications using the Workers programming model.
The current Workers runtime uses a customized runtime called workerd.
Cloudflare has open-sourced the workerd runtime.
Cloudflare compiles Python to WebAssembly via Pyodide, running it inside its V8-based open-source runtime workerd, rather than directly embedding the traditional CPython interpreter.
pywrangler runs a complete technology stack simulation locally, hosted by a workerd binary of approximately 123MB.
workerd is a JavaScript/Wasm runtime open-sourced by Cloudflare in 2022, and is the same engine used in Cloudflare Workers' production environment.
workerd is designed for multi-tenant isolation, with each request executing in an independent V8 Isolate and cold start times measured in milliseconds.
All Facts (7)
The current Workers runtime uses a customized runtime called workerd.
50%UnverifiedCloudflare has open-sourced the workerd runtime.
50%Unverifiedworkerd is designed for multi-tenant isolation, with each request executing in an independent V8 Isolate and cold start times measured in milliseconds.
50%UnverifiedCloudflare compiles Python to WebAssembly via Pyodide, running it inside its V8-based open-source runtime workerd, rather than directly embedding the traditional CPython interpreter.
50%Unverifiedpywrangler runs a complete technology stack simulation locally, hosted by a workerd binary of approximately 123MB.
50%Unverifiedworkerd is a JavaScript/Wasm runtime open-sourced by Cloudflare in 2022, and is the same engine used in Cloudflare Workers' production environment.
50%UnverifiedCloudflare acquired Deno, with the goal of building on celld to make self-hosting workerd a first-class supported way to build and run applications using the Workers programming model.
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