In the browser

Summand has no Node-specific code in its main entry point. It works in every modern browser, in Web Workers, in Deno, Bun and edge runtimes.

import { validateInvoice } from "@sweberdev/summand";

async function onFile(file: File) {
  const result = validateInvoice(await file.arrayBuffer());
  setResult(result);
}

The invoice never leaves the browser, which helps when you would rather not store invoices before they are accepted.

Size and speed

All four rule sets are bundled as JSON: about 90 KB gzipped in total. A typical invoice validates in 20 to 60 ms; large invoices with hundreds of lines take longer. For big files, run it in a Web Worker so the page stays responsive:

// worker.ts
import { validateInvoice } from "@sweberdev/summand";
self.onmessage = (e: MessageEvent<ArrayBuffer>) => self.postMessage(validateInvoice(e.data));

The live demo runs exactly this in the browser.