{
  "schemaVersion": 1,
  "reviewDate": "2026-09-29",
  "scope": "Selected public JavaScript JPEG XL APIs and their official browser tools. Not an exhaustive ecosystem survey.",
  "subjects": [
    {
      "id": "purejsimage",
      "packageVersion": "0.17.0",
      "implementationRevision": "564a4d2d3e1c318f64821322c67329550df6da6b",
      "source": "https://github.com/a-r-d/PureJsImage/tree/564a4d2d3e1c318f64821322c67329550df6da6b",
      "implementation": "first-party TypeScript; measured local build of this revision, not an assertion about the npm 0.17.0 tarball",
      "apiEvidence": ["dist/browser.d.ts", "dist/codec-entries/jpegxl.d.ts", "dist/jpegxl.d.ts"]
    },
    {
      "id": "jsquash",
      "package": "@jsquash/jxl",
      "version": "1.3.0",
      "npmGitHead": "1b1964194611ece3ec984ab91c04726d1088f05e",
      "source": "https://github.com/jamsinclair/jSquash/tree/main/packages/jxl",
      "implementation": "Published Emscripten libjxl WASM; exact embedded upstream libjxl revision not stated by package manifest",
      "tool": "jSquash codecs derive from Squoosh; ImageData decode/encode API, optional threaded browser encoder with isolation",
      "apiEvidence": [
        "node_modules/@jsquash/jxl/README.md",
        "node_modules/@jsquash/jxl/decode.d.ts",
        "node_modules/@jsquash/jxl/encode.d.ts",
        "node_modules/@jsquash/jxl/encode.js"
      ]
    },
    {
      "id": "oxide",
      "package": "jxl-oxide-wasm",
      "version": "0.12.6",
      "npmGitHead": null,
      "source": "https://github.com/tirr-c/jxl-oxide/tree/main/crates/jxl-oxide-wasm",
      "implementation": "Official published Rust/wasm-bindgen binding; not a custom source build; npm manifest does not identify its exact source commit",
      "tool": "Official demo: https://github.com/tirr-c/jxl-oxide-wasm-demo. Binding exposes incremental feeding, frame rendering, regions, ICC and PNG export. No public raw-sample export or encoder.",
      "apiEvidence": [
        "node_modules/jxl-oxide-wasm/README.md",
        "node_modules/jxl-oxide-wasm/jxl_oxide_wasm.d.ts",
        "node_modules/jxl-oxide-wasm/jxl_oxide_wasm.js"
      ]
    },
    {
      "id": "vips",
      "package": "wasm-vips",
      "version": "0.0.19",
      "npmGitHead": "49ac4378f2df80e38f45491abeeac9b86dddbedd",
      "source": "https://github.com/kleisauke/wasm-vips",
      "implementation": "Published libvips 8.18.7 / libjxl 0.12.0 / Emscripten 6.0.10 WASM. Request only the supported vips-jxl dynamic plugin.",
      "tool": "Official interactive playground: https://wasm-vips.kleisauke.nl/. General image processing and typed memory APIs; browser requires cross-origin isolation even with concurrency(1).",
      "apiEvidence": [
        "node_modules/wasm-vips/README.md",
        "node_modules/wasm-vips/lib/vips.d.ts",
        "node_modules/wasm-vips/lib/versions.json"
      ]
    }
  ],
  "otherTools": [
    {
      "name": "Squoosh",
      "source": "https://github.com/GoogleChromeLabs/squoosh",
      "scope": "Browser image compression application and historical source of jSquash codecs; surveyed as a tool, not measured as another independent codec implementation."
    }
  ],
  "limits": [
    "No universal best/widest/only claim follows from this selection.",
    "Installed package declarations and glue were inspected alongside official documentation. Missing APIs are wrapper boundaries, not claims about the full native engine.",
    "Published WASM binaries and npm lockfile integrity are the reproducibility pins when build-source provenance is unavailable."
  ]
}