QuickBEAM – run JavaScript as supervised Erlang/OTP processes
QuickBEAM is a JavaScript runtime embedded inside the Erlang/OTP VM. If you’re building a full-stack app, JavaScript tends to leak in anyway — frontend, SSR, or third-party code. QuickBEAM runs that JavaScript inside OTP supervision trees. Each runtime is a process with a `Beam` global that can: - call Elixir code - send/receive messages - spawn and monitor processes - inspect runtime/system state It also provides browser-style APIs backed by OTP/native primitives (fetch, WebSocket, Worker, BroadcastChannel, localStorage, native DOM, etc.). This makes it usable for: - SSR…
In plain words
QuickBEAM is a JavaScript runtime that runs inside the Erlang/OTP virtual machine, allowing JavaScript code to execute as supervised OTP processes. It is designed for full-stack developers who need to run JavaScript—for server-side rendering, sandboxed user code, or third-party scripts—while maintaining integration with Erlang/Elixir systems. Each runtime can call Elixir code, send and receive messages, spawn processes, and access browser-style APIs like fetch and WebSocket. The runtime includes memory and execution limits for sandboxing, supports a native DOM that Erlang can read directly, and eliminates JSON serialization overhead between languages.
written from the facts on this page · September 2026
From the sources
In the maker’s words, at launch
QuickBEAM is a JavaScript runtime embedded inside the Erlang/OTP VM. If you’re building a full-stack app, JavaScript tends to leak in anyway — frontend, SSR, or third-party code. QuickBEAM runs that JavaScript inside OTP supervision trees. Each runtime is a process with a `Beam` global that can: - call Elixir code - send/receive messages - spawn and monitor processes - inspect runtime/system state It also provides browser-style APIs backed by OTP/native primitives (fetch, WebSocket, Worker, BroadcastChannel, localStorage, native DOM, etc.). This makes it usable for: - SSR - sandboxed user code - per-connection state - backend JS with direct OTP interop Notable bits: - JS runtimes are supervised and restartable - sandboxing with memory/reduction limits and API control - native DOM that Erlang can read directly (no string rendering step) - no JSON boundary between JS and Erlang - built-in TypeScript, npm support, and native addons QuickBEAM is part of Elixir Volt — a full-stack frontend toolchain built on Erlang/OTP with no Node.js. Still early, feedback welcome.
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