@jsonstat-validator/wasm

The WebAssembly surface of jsonstat-validator — a thin JS wrapper over the Rust crate, exposing the same validate() signature as @jsonstat-validator/ts so the two are drop-in compatible.

The Wasm build is produced from the crate with wasm-pack (--target web); the wrapper in src/index.ts adapts the validate_json export to the TS ValidationResult shape.

Built on top of the same rules-manifest.json and corpus/cases.json as the TS and Rust surfaces, so all three produce identical findings on identical input (enforced by the parity tests).

Install

npm install @jsonstat-validator/wasm

Usage

Browser / CDN

init() (no argument) fetches the adjacent .wasm over HTTP:

import { init, validate } from "@jsonstat-validator/wasm";

await init();                       // load the .wasm once
const result = validate(doc);       // doc may be an object OR a JSON string
console.log(result.valid, result.summary);

With a bundler (Vite/webpack/Rollup) the .wasm is emitted next to the JS automatically.

Node

The @jsonstat-validator/wasm/node entry auto-loads the .wasm bytes from disk on import, so no manual init() is needed, and it adds validateFile():

import { validate, validateFile } from "@jsonstat-validator/wasm/node";

const result = validate(doc);
const result2 = await validateFile("./my-cube.json");

(You can also use the main entry in Node by passing the bytes explicitly: await init(readFileSync(require.resolve("@jsonstat-validator/wasm/pkg/jsonstat_validator_bg.wasm"))).)

Differences from @jsonstat-validator/ts

| Concern | TS surface | Wasm surface | |---|---|---| | Lifecycle | none (pure JS) | await init() once (browser) / auto on Node | | options.onFinding | supported (JS callback) | ignored (functions can't cross the JS↔wasm boundary) | | options.budget | honored | ignored (Rust ValidateOptions skips unknown fields) | | meta.durationMs | wall-clock ms (number) | always 0 — wasm32-unknown-unknown has no Instant, so timing is skipped | | Finding shape (code/severity/path/message) | — | identical (parity-tested) |

If you don't need the Wasm performance characteristics or wasm-pack toolchain, prefer @jsonstat-validator/ts — it has zero native/Rust dependencies.

Building the Wasm artifact from source

# prerequisites (one-time)
rustup target add wasm32-unknown-unknown
cargo install wasm-pack

npm run build          # wasm-pack -t web -> packages/wasm/pkg, then tsc -> dist
npm test               # builds pkg and runs the TS↔Wasm corpus parity test

License

Apache-2.0.