Modal Sandboxes
Run untrusted code safely at scale
What it does
Modal Sandboxes are the fastest way to safely run untrusted code at scale. Get full environment control (any language, any dependency), complete isolation between executions, fast cold starts, and filesystem snapshots - all through one simple API.
Does a similar job
all alternatives →- SUSandboxing untrusted code using WebAssemblyFeb 2026 · github.com · ▲76
Hi everyone, I built a runtime to isolate untrusted code using wasm sandboxes. Basically, it protects your host system from problems that untrusted code can cause. We’ve had a great discussion about sandboxing in Python lately that elaborates a bit more on the problem [1]. In TypeScript, wasm integration is even more natural thanks to the close proximity between both ecosystems. The core is built in Rust. On top of that, I use WASI 0.2 via wasmtime and the component model, along with custom SDKs that keep things as idiomatic as possible. For example, in Python we have a simple decorator:…
- SASandy – A tiny Sandbox to run untrusted code ️2020 · github.com · ▲64
- EJExecute JavaScript in a WebAssembly QuickJS sandbox2024 · github.com · ▲206
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…
- ZSZerobox – Sandbox any command with file, network, credential controlsMar 2026 · github.com · ▲141
I'm excited to introduce Zerobox, a cross-platform, single binary process sandboxing CLI written in Rust. It uses the sandboxing crates from the OpenAI Codex repo and adds additional functionalities like secret injection, SDK, etc. Watch the demo: https://www.youtube.com/watch?v=wZiPm9BOPCg Zerobox follows the same sandboxing policy as Deno which is deny by default. The only operation that the command can run is reading files, all writes and network I/O are blocked by default. No VMs, no Docker, no remote servers. Want to block reads to /etc? zerobox…
- ASAmla Sandbox – WASM bash shell sandbox for AI agentsJan 2026 · github.com · ▲146
WASM sandbox for running LLM-generated code safely. Agents get a bash-like shell and can only call tools you provide, with constraints you define. No Docker, no subprocess, no SaaS — just pip install amla-sandbox
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