Simon Willison • 12/23/2025

MicroQuickJS

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The article analyzes MicroQuickJS, a new JavaScript engine from Fabrice Bellard designed for embedded systems with minimal RAM. It investigates its potential as a secure sandbox for untrusted code, testing its built-in memory/time limits, lack of dangerous APIs, and regex engine safety. The author details experiments with Python bindings, CLI tools, and WebAssembly compilation to evaluate its suitability for sandboxing applications.

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#JavaScript #sandboxing #memory management
MicroQuickJS

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