@sweberdev/inverse

Withdrawal button (§ 356a BGB) and cancellation button (§ 312k BGB) for any web app: validation, server-side record with date and time of receipt, acknowledgement e-mail in seven languages, deadline helpers, a Request → Response handler and the inverse check CLI.

pnpm add @sweberdev/inverse

import { createInverseHandler } from "@sweberdev/inverse";

export const POST = createInverseHandler({
  company: { name: "Acme GmbH", email: "[email protected]" },
  onDeclaration: (record) => save(record),
  sendReceipt: (receipt) => send(receipt), // { to, subject, text, html }
});

npx inverse check https://shop.example.com

Without React, in plain HTML, WordPress or Shopify:

<a data-inverse-link="withdrawal" href="/widerruf"></a>
<div data-inverse-form="withdrawal" data-endpoint="/api/inverse"></div>
<script src="https://cdn.jsdelivr.net/npm/@sweberdev/inverse@2/dist/inverse.global.js" defer></script>

or import { mountDeclarationForm } from "@sweberdev/inverse/ui".

React components: @sweberdev/inverse-react. Docs: packages.sweber.dev/inverse/docs.

MIT. Inverse is software, not legal advice.

Inverse Pro

Need more than the free package? Inverse Pro adds:

• Evidence ledger: declarations and receipts in a hash chain, with an evidence sheet per declaration
• Site audit: checks every page for both buttons and writes a report for clients
• Mail: receipts in your branding, team notifications with the next due date, transports for common mail providers

Subscriptions from CHF 19 per month, or a one-time lifetime licence. See what is included