Contract Data Extraction: A REST API Approach

Invoices, receipts, and other business documents contain the data your app needs - but extracting that data reliably is harder than it looks.

This guide walks through how modern invoice extraction APIs solve it.

The Problem

Manual data entry is slow. Traditional OCR returns unstructured text. Training your own ML model is expensive.

The Solution

A single REST API call that returns structured JSON.

curl -X POST https://invoice-extract-api-4eq9.onrender.com/extract \
 -F file=@invoice.pdf

Returns:

{
 "vendor": "ACME Ltd",
 "date": "2026-09-14",
 "total": 2420.00,
 "currency": "USD",
 "line_items": [...]
}

Try It Free

Get started with the free tier at Invoice to JSON Extractor.