OpenFDD Sandbox — Live Reader & Composer

Load example: 📂 Open file

Source

Log

Output

🔍

Load a .fdd and click Parse & Verify to see the step-by-step pipeline log.

⬆️

Parsed document renders here after clicking Parse & Verify.

Load example data:

Source

Log

Output

Issuer DID:

credentialSubject — JSON Data (immutable, signed payload)

{
  "accountHolder": "Jane Doe",
  "accountNumber": "••••4242",
  "balance": "4,200.00",
  "statementDate": "2026-04-11"
}

HTML Template (presentation layer — also signed)

<style>body{font-family:system-ui;padding:2rem;background:#f8fafc}h1{color:#1e3a5f}.f{margin:.5rem 0}label{font-size:.75rem;color:#64748b;display:block}value{font-size:1.1rem;font-weight:600;color:#0f172a}</style>
<h1>Statement for {{accountHolder}}</h1>
<div class="f"><label>Account</label><value>{{accountNumber}}</value></div>
<div class="f"><label>Balance</label><value>${{balance}}</value></div>
<div class="f"><label>Date</label><value>{{statementDate}}</value></div>

✍️

Fill in your JSON data and HTML template, then click Sign & Compose to see the verbose signing pipeline.

Composed .fdd will appear here