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OPFS + Pyodide test harness

Simon Willison explores integrating Origin Private File System (OPFS) with Pyodide to enable Datasette Lite to edit persistent SQLite files directly within the browser. He utilized an AI coding assistant to build a test harness that validates this capability across different web browsers.

Background

Datasette Lite runs Python applications in the browser via WebAssembly, while OPFS provides a secure, persistent file storage API for web applications.

Source
Simon Willison
Published
Jun 24, 2026 at 02:58 AM
Score
6.0 / 10