# jsx/JSX

JSX - a faster, safer, easier JavaScript

Repository: https://github.com/jsx/JSX
Canonical: https://ross.abutalabs.com/products/jsx-jsx
Homepage: http://jsx.github.io/
Language: JavaScript
License: MIT
License Family: permissive
Last push: 2021-09-01T01:16:37+00:00

## Health v2 (maintenance only)
Score: 32/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 0, release rhythm 35, longevity 100
- inputs: {"age_days": 5208, "days_push": 1828, "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 1470, forks 103 (observed 2026-08-28T04:04:49.177878+00:00)

## What it is
JSX is a statically-typed, class-based programming language developed at DeNA that compiles to JavaScript, aiming to be faster, safer, and easier than plain JavaScript. It ships as an npm-distributed compiler toolkit with a jsx(1) CLI for compiling, running, optimizing, and testing JSX source files.

## Use cases
- compile a statically-typed language to javascript
- write class-based oop code that runs in browsers
- optimize javascript performance via compile-time optimizations
- run and test altjs source files from the command line
- port performance-critical javascript libraries to a typed language

## When to choose
- you want static typing and a Java-like class system targeting javascript
- you need compile-time type checking and optimizations for browser or node code

## When to avoid
- you need an actively maintained toolchain - the last release was 2021 and the project is dormant
- you prefer modern alternatives like TypeScript
- you need a large ecosystem or community support

## Facets
- artifact type: cli-tool
- maturity: abandoned
- function: compiler, programming-language, cli, testing
- domain: programming-languages, compilers, web-development, developer-tools
- platform: cross-platform, cli
- tags: altjs, statically-typed, transpiler, javascript-compiler, class-based-oop, nodejs, web-server

## Member repositories
- jsx/JSX (main) score 32

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:04:49.177878+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 2026-08-30T04:34:49.707120+00:00, confidence not recorded.
  - readme: https://github.com/jsx/JSX (fetched 2026-08-28T04:04:49.177878+00:00, sha e378990d4bbb)
  - homepage: http://jsx.github.io/ (fetched 2026-08-29T11:43:06.042403+00:00, sha 3cba5bc84432)
  - registry_npm: https://registry.npmjs.org/jsx (fetched 2026-08-29T11:43:06.051112+00:00, sha 172c3fadff1c)
- Data as of 2026-08-30T08:39:29.467469+00:00.