Modal Sandboxes
Run untrusted code safely at scale
Modal Sandboxes launched on January 22, 2025 with 12 votes, #1,233 of 6,142 launches that month and more than 75% of that year's launches. The site was still online in September 2026, 1 year on.
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.
Sandboxes are a new way to run code in Modal, with a focus on security and isolation.
Sandboxes are the Modal primitive for safely running untrusted code, whether that code comes from LLMs, users, or other third-party sources. We’ve been honing Sandboxes in beta for the past year, and today we’re excited to announce they’re generally available! We built Modal Functions to run code written by you, the user. Your Functions can interact with your Modal workspace - they can mount Secrets, create Volumes, call other Functions, and more. This model works because you know you can trust the code you deploy directly. But agentic systems need to execute code without human supervision. Your agent may make a destructive mistake, or a malicious user may prompt your agent in a dangerous…from modal.com
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Sandy – A tiny Sandbox to run untrusted code ️2020 · github.com · ▲64A tiny "sandbox" to run untrusted code 🏖️. Contribute to craigmulligan/sandy development by creating an account on GitHub.
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Execute JavaScript in a WebAssembly QuickJS sandbox2024 · github.com · ▲206This 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…
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YepCode2022 · yepcode.io · ▲157Hey HN, We’re excited to introduce YepCode Run, a serverless runtime and SDK for executing code in secure sandboxes. Built on top of YepCode (https://yepcode.io), it allows you to execute code without any setup or installation. Perfect for: * Running AI-generated code – Securely in a sandbox environment, enabling fully autonomous AI agents. * Package Exploration – Try npm or PyPI packages without installing them locally. * Code Sharing – Easily share runnable code examples with others. * Quick Prototyping – Test snippets and algorithms on the fly. Just write or paste your code, and…
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