22nd March 2026
Research
JavaScript Sandboxing Research
— Analyzing current JavaScript sandboxing options for running untrusted code, this research compares core approaches in Node.js (including worker_threads, node:vm, and the Permission Model), prominent npm packages (isolated-vm, vm2), and alternative engines like quickjs-emscripten.
Aaron Harper wrote about Node.js worker threads, which inspired me to run a research task to see if they might help with running JavaScript in a sandbox. Claude Code went way beyond my initial question and produced a comparison of isolated-vm, vm2, quickjs-emscripten, QuickJS-NG, ShadowRealm, and Deno Workers.
Recent articles
- Datasette Apps: Host custom HTML applications inside Datasette - 18th June 2026
- GLM-5.2 is probably the most powerful text-only open weights LLM - 17th June 2026
- Publishing WASM wheels to PyPI for use with Pyodide - 13th June 2026