LedgerLens SDK

The official TypeScript/JavaScript SDK for LedgerLens - Document Intelligence API with math verification.

Installation

npm install ledgerlens

Quick Start

import { LedgerLens } from "ledgerlens";

const client = new LedgerLens({
  apiKey: "ll_sk_...",
});

// Extract data from an invoice
const result = await client.extract.extract({
  file: fs.createReadStream("invoice.pdf"),
  documentType: "invoice",
});

console.log(result.data);
// {
//   vendor: "Acme Corp",
//   total: 1234.56,
//   line_items: [...],
//   math_verified: true
// }

Features

• Multi-document support: invoices, receipts, purchase orders, bills of lading, bank statements
• Custom schemas: Extract any fields you define
• Math verification: Reflexion loop ensures calculations are correct
• TypeScript-first: Full type definitions included

Documentation

See the full documentation at ledgerlens.docs.buildwithfern.com

License

MIT