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Lasm Lets Developers Write Formally Verified Web Apps in Lean for Node and Edge

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A developer has released Lasm, a project that brings the Lean programming language to browsers, Node, serverless, and edge environments. The tool aims to let developers write full web applications, from frontend to backend, in Lean and formally verify them within the same language. The author cites Express- or Hono-style servers running on Cloudflare Workers as an example of the intended use, with their specifications formally checked. The author says Lasm was built largely with Claude Opus 5.5 under their high-level direction. The project was shared on Hacker News, where it had two points and no comments at the time of writing.

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