OpenWorkers

What is OpenWorkers?

OpenWorkers is an open-source runtime that enables developers to execute untrusted JavaScript code in isolated V8 environments on their own infrastructure. Built in Rust using rusty_v8, it provides the same developer experience as Cloudflare Workers while eliminating vendor lock-in concerns. The project evolved from earlier implementations using vm2 and deno-core before being rewritten for improved performance and reliability. OpenWorkers allows teams to run serverless-style JavaScript workloads with strong isolation guarantees, making it suitable for multi-tenant applications, sandboxed code execution, and edge computing scenarios where infrastructure control is required. Key features include V8 isolate-based sandboxing for security, a familiar Workers-compatible API, and the ability to self-host on custom infrastructure. This approach appeals to organizations that need the scalability and simplicity of worker-based computing but require data residency compliance, reduced operational costs, or independence from third-party platforms. The project is available as open-source software, making it accessible for developers and organizations looking to implement isolated JavaScript execution without licensing restrictions. OpenWorkers targets teams building platforms, APIs, or services that need safe execution of user-supplied or third-party code.