Execute JavaScript in a WebAssembly QuickJS sandbox
This TypeScript package allows you to safely execute JavaScript code within a WebAssembly sandbox using the QuickJS engine. Perfect for isolating and running untrusted code securely, it leverages the lightweight and fast QuickJS engine compiled to WebAssembly, providing a robust environment for code execution. Features - *Security*: Run untrusted JavaScript code in a safe, isolated environment. - *File System*: Can mount a virtual file system - *Custom Node Modules*: Custom node modules are mountable - *Fetch Client*: Can provide a fetch client to make http(s) calls - *Test-Runner*: Includes…
In plain words
This TypeScript package executes JavaScript code in a secure WebAssembly sandbox using the QuickJS engine, designed for running untrusted code safely. It supports virtual file systems, custom Node modules, HTTP requests via a fetch client, and includes a built-in test runner with chai assertions. The lightweight QuickJS engine provides fast performance while maintaining isolation, making it suitable for developers who need to execute and manage untrusted JavaScript within TypeScript applications.
written from the facts on this page · September 2026
From the sources
In the maker’s words, at launch
This TypeScript package allows you to safely execute JavaScript code within a WebAssembly sandbox using the QuickJS engine. Perfect for isolating and running untrusted code securely, it leverages the lightweight and fast QuickJS engine compiled to WebAssembly, providing a robust environment for code execution. Features - *Security*: Run untrusted JavaScript code in a safe, isolated environment. - *File System*: Can mount a virtual file system - *Custom Node Modules*: Custom node modules are mountable - *Fetch Client*: Can provide a fetch client to make http(s) calls - *Test-Runner*: Includes a test runner and chai based `expect` - *Performance*: Benefit from the lightweight and efficient QuickJS engine. - *Versatility*: Easily integrate with existing TypeScript projects. - *Simplicity*: User-friendly API for executing and managing JavaScript code in the sandbox.
Does the same job
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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…
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