# asm-js/validator

A reference validator for asm.js.

Repository: https://github.com/asm-js/validator
Canonical: https://ross.abutalabs.com/products/asm-js-validator
Language: JavaScript
License: Apache-2.0
License Family: permissive
Last push: 2019-01-27T02:44:02+00:00

## Health v2 (maintenance only)
Score: 32/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 0, release rhythm 35, longevity 100
- inputs: {"age_days": 5067, "days_push": 2775, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1771, forks 144 (observed 2026-08-28T04:05:34.037113+00:00)

## What it is
A reference validator for asm.js, the highly optimizable subset of JavaScript targeted by compilers like Emscripten. It checks JavaScript source code for conformance to the asm.js specification.

## Use cases
- validate that a JavaScript module conforms to the asm.js spec
- check asm.js output from Emscripten for correctness
- learn how asm.js validation rules work
- experiment with the asm.js type system
- build tooling around asm.js code verification

## When to choose
- you need to verify asm.js conformance of generated JavaScript
- you are researching or implementing the asm.js specification
- you want a reference implementation of asm.js validation rules

## When to avoid
- you need a validator up to date with the latest asm.js working draft (the code lags the spec)
- you want actively maintained or well-tested tooling
- you are targeting WebAssembly instead of asm.js

## Facets
- artifact type: library
- maturity: abandoned
- function: parser, developer-tools
- domain: programming-languages, compilers, developer-tools, performance
- platform: browser
- tags: asmjs, validation, javascript-subset, reference-implementation, specification, javascript, nodejs

## Member repositories
- asm-js/validator (main) score 32

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:05:34.037113+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 2026-08-30T03:25:59.579444+00:00, confidence not recorded.
  - readme: https://github.com/asm-js/validator (fetched 2026-08-28T04:05:34.037113+00:00, sha fa7c7e9c9c26)
- Data as of 2026-08-30T08:39:29.467469+00:00.