8 browser sandboxes without Docker: how we isolated code execution on the client side

▤ Summary

This article presents a browser-based sandbox system that runs code safely on the client side without Docker. It covers isolated execution for JavaScript, Python, SQL, HTML/CSS, Markdown, Bash, Regex, and Cron using Web Workers, WebAssembly, iframe sandboxing, and sanitization tools. The implementation also adds timeout controls, cancellation, logging capture, and fallback loading for Pyodide and SQL.js from CDNs. The piece is highly technical and focused on building a developer platform for secure in-browser code execution.

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