macaly/almostnode
Node.js in your browser. Just like that. observed · 2026-08-28
Health v2 · maintenance only
45/100
- Activity 67
- Release rhythm 35
- Longevity 15
Flags: no_releases
How is this computed?
round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10) — computed 2026-09-03. Adoption (stars, forks) is never an input.
- gap_med: n/a
- age_days: 216
- days_rel: n/a
- days_push: 200
- n_releases_24m: 0
Adoption not part of the score
1160 stars · 103 forks observed · 2026-08-28
What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded
almostnode is a TypeScript library that emulates a Node.js runtime entirely in the browser, providing a POSIX-compatible virtual filesystem, 40+ shimmed Node.js modules, and a client-side npm package manager. It also ships built-in Vite and Next.js dev servers with HMR, exposed through a service worker bridge so virtual servers are reachable via real URLs.
Use cases
- run node.js code in the browser
- install npm packages client-side without a server
- run express or http servers entirely in the browser
- run vite or next.js dev server in the browser
- sandbox and execute untrusted javascript safely
- build an in-browser coding playground or REPL
- run cli tools like eslint or vitest in the browser
When to choose
- you need a Node.js-like environment or dev server running fully client-side with no backend
- you're building an online IDE, playground, or AI coding agent that executes code in the browser
- you need to run npm packages or CLI tools (vitest, eslint, tsc) without a server
- you need sandboxed execution of untrusted code via cross-origin isolation
When to avoid
- you need a production-grade, fully compatible Node.js runtime — this is experimental and emulates only a subset of Node 20 APIs
- your code relies on native modules, real OS filesystem access, or full Node.js fidelity
- you're running trusted code on the main thread with createContainer() — it has no isolation
Facets
library · maturity experimental
http-server package-manager file-system interpreter developer-tools sdk web-development developer-tools frontend browser wasm nodejs-runtime webcontainers virtual-filesystem npm-in-browser in-browser-dev-server sandboxed-execution service-worker hmr vite nextjs javascript web-server nodejs
7 sources
- readme: https://github.com/macaly/almostnode · fetched 2026-08-28 · 89bcf6351749
- homepage: http://almostnode.dev/ · fetched 2026-08-29 · 2d93cfac1618
- site_page: http://almostnode.dev/docs · fetched 2026-08-29 · aa73477d2808
- site_page: http://almostnode.dev/docs/security.html · fetched 2026-08-29 · a612cf0f8074
- site_page: http://almostnode.dev/docs/api-reference.html · fetched 2026-08-29 · 174d58bab26e
- registry_npm: https://registry.npmjs.org/almostnode · fetched 2026-08-29 · ab961f5bbe6f
- site_page: http://almostnode.dev/examples/express-demo.html · fetched 2026-08-29 · 35fd0d0880b6
Member repositories
| Repository | Role | Health v2 |
|---|---|---|
| macaly/almostnode | main | 45 |
For agents
markdown · JSON · MCP: product_card(name="macaly/almostnode")
Data as of 2026-08-30T08:39:29.467469+00:00 · Report a problem