# bytecodealliance/javy

JS to WebAssembly toolchain

Repository: https://github.com/bytecodealliance/javy
Canonical: https://ross.abutalabs.com/products/javy
Language: Rust
License: Apache-2.0
License Family: permissive
Last push: 2026-08-12T14:37:00+00:00

## Health v2 (maintenance only)
Score: 97/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 97, release rhythm 95, longevity 100
- inputs: {"age_days": 1959, "days_push": 21, "days_rel": 34, "gap_med": 29, "n_releases_24m": 18}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 2734, forks 135 (observed 2026-08-28T04:07:16.246812+00:00)

## What it is
Javy is a JavaScript-to-WebAssembly toolchain that compiles JavaScript source into small Wasm modules executed in an embedded JS runtime. It ships as a Rust CLI and integrates with Wasm engines like Wasmtime.

## Use cases
- compile javascript to webassembly
- run js in wasmtime
- build small wasm modules from javascript
- deploy javascript as wasm serverless functions
- execute javascript in a wasm sandbox
- create wasm binaries from node scripts

## When to choose
- you want to run JavaScript inside WebAssembly runtimes like Wasmtime or WASI environments
- you need tiny Wasm modules (1-16 KB with dynamic linking) for plugins or edge/serverless workloads
- you want sandboxed, portable execution of JS code

## When to avoid
- you need full Node.js APIs or npm ecosystem compatibility at runtime
- you want browser-targeted JavaScript bundling rather than WASI Wasm output
- your project requires DOM or native module access

## Facets
- artifact type: cli-tool
- maturity: active
- function: compiler, wasm, cli, interpreter, build-tool
- domain: developer-tools, compilers, web-development, cross-platform
- platform: cli, wasm, rust, windows
- tags: javascript, webassembly, quickjs, wasm-toolchain, serverless-wasm, bytecode-alliance, linux, macos

## Member repositories
- bytecodealliance/javy (main) score 97

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:07:16.246812+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T02:14:27.965178+00:00, confidence not recorded.
  - readme: https://github.com/bytecodealliance/javy (fetched 2026-08-28T04:07:16.246812+00:00, sha 3ed0ea45f715)
  - registry_crates: https://crates.io/api/v1/crates/javy (fetched 2026-08-29T09:57:28.719304+00:00, sha 469655be9414)
- Data as of 2026-08-30T08:39:29.467469+00:00.