What does it do?
Lasm compiles Lean 4 to WebAssembly, a format that runs on JavaScript and WebAssembly runtimes. [1a][1b] A person writes an app in Lean, can prove properties about it, and runs the result on Node.js, Bun, Deno, Cloudflare Workers, browsers, and other listed platforms. [2] The README's example is a RealWorld app (a Medium clone) written entirely in Lean, including its web API and browser app. [3]
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Spent some time with Lasm (Millillion/lasm). It brings Lean to the browser, Node, serverless, and edge environments—an Express or Hono server on Cloudflare Workers, with formal verification of its spec. You can write frontend to backend in Lean and verify it there. Lean is general purpose with verification built in, which is the part that matters. Caveat: the repo says it was built mostly by Claude Opus 5.5 with high-level direction, so treat the toolchain accordingly. Discord discord.gg #lasm #lean
just found a cool open-source project called Lasm. it lets you build web apps in Lean 4 and mathematically prove parts of your code are correct. with AI writing more code than ever, this might actually be a big deal. Millillion/lasm
Show HN: Lasm – Write formally verified webapps in Lean for Node/serverless/edge Millillion/lasm (news.ycombinator.com)
Show HN: Lasm – Write formally verified webapps in Lean for Node/serverless/edge Millillion/lasm (news.ycombinator.com)
Show HN: Lasm – Write formally verified webapps in Lean for Node/serverless/edge
@itz_komal01 We are: Millillion/lasm Though I like to think I'm agentic engineering here
Lasm compiles Lean 4 to WebAssembly and ships a RealWorld app with 117 proved theorems. Proof-carrying code for Node, edge, serverless — and the first framework whose README is written for your coding agent. "Verified" should mean this. Millillion/lasm
Show HN: Lasm – Write formally verified webapps in Lean for Node/serverless/edge Millillion/lasm
Show HN: Lasm – Write formally verified webapps in Lean for Node/serverless/edge Discussion
Show HN: Lasm – Write formally verified webapps in Lean for Node/serverless/edge comments · posted on 2026.10.29 at 22:05:41 (c=0, p=3)