Simon Willison’s Weblog

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23rd December 2025

Research mquickjs-sandbox — Exploring mquickjs, a highly minimal JavaScript engine, this project rigorously evaluates its suitability as a safe sandbox for running untrusted code. Various integration approaches are implemented, including Python FFI, C extensions, subprocess invocation, and WebAssembly runtimes—each tested for startup and execution performance, security isolation, and feature compatibility.

This is a beat by Simon Willison, posted on 23rd December 2025.

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