AI ToolsJun 23, 2026, 6:58 PM

OPFS + Pyodide test harness

TickrWire Editorial Desk·Jun 23, 2026, 6:58 PM·1 min read AI-assisted, human-reviewed

Reported by Simon Willison: OPFS + Pyodide test harness. Analysis and context written by TickrWire.

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Simon Willison built a test harness combining OPFS and Pyodide to enable persistent SQLite file editing in-browser for Datasette Lite.

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<p><strong>Tool:</strong> <a href="https://tools.simonwillison.net/opfs-pyodide">OPFS + Pyodide test harness</a></p>

<p>I've been pondering if <a href="https://lite.datasette.io/">Datasette Lite</a> - the Python Datasette application run entirely in the browser using Pyodide and WebAssembly - might be able to edit persistent SQLite files stored on the user's computer.</p>

<p>That's what <a href="https://developer.mozilla.org/en-US/docs/Web/API/File_System_API/Origin_private_file_system">OFPS</a> (Origin Private File System) is for, so I had Claude Code for web build me th

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