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+Code Examples
+Practical examples for generating PDFs with the DocFast API — invoices, reports, receipts, and integration guides.
+Generate an Invoice PDF
+Create a professional invoice with inline CSS and convert it to PDF with a single API call.
+ +
+ HTML — invoice.html
+
+
+ <html>
+<body style="font-family: sans-serif; padding: 40px; color: #333;">
+ <div style="display: flex; justify-content: space-between;">
+ <div>
+ <h1 style="margin: 0; color: #111;">INVOICE</h1>
+ <p style="color: #666;">#INV-2026-0042</p>
+ </div>
+ <div style="text-align: right;">
+ <strong>Acme Corp</strong><br>
+ 123 Main St<br>
+ hello@acme.com
+ </div>
+ </div>
+
+ <table style="width: 100%; border-collapse: collapse; margin-top: 40px;">
+ <tr style="border-bottom: 2px solid #111;">
+ <th style="text-align: left; padding: 8px 0;">Item</th>
+ <th style="text-align: right; padding: 8px 0;">Qty</th>
+ <th style="text-align: right; padding: 8px 0;">Price</th>
+ </tr>
+ <tr style="border-bottom: 1px solid #eee;">
+ <td style="padding: 12px 0;">API Pro Plan (monthly)</td>
+ <td style="text-align: right;">1</td>
+ <td style="text-align: right;">$49.00</td>
+ </tr>
+ <tr>
+ <td style="padding: 12px 0;">Extra PDF renders (500)</td>
+ <td style="text-align: right;">500</td>
+ <td style="text-align: right;">$15.00</td>
+ </tr>
+ </table>
+
+ <p style="text-align: right; font-size: 1.4em; margin-top: 24px;">
+ <strong>Total: $64.00</strong>
+ </p>
+</body>
+</html>
+ curl
+
+ curl -X POST https://api.docfast.dev/v1/convert/html \
+ -H "Authorization: Bearer YOUR_API_KEY" \
+ -H "Content-Type: application/json" \
+ -d '{"html": "<html>...your invoice HTML...</html>"}' \
+ --output invoice.pdfConvert Markdown to PDF
+Send Markdown content directly — DocFast renders it with clean typography and outputs a styled PDF.
+ +
+ curl
+
+ curl -X POST https://api.docfast.dev/v1/convert/markdown \
+ -H "Authorization: Bearer YOUR_API_KEY" \
+ -H "Content-Type: application/json" \
+ -d '{
+ "markdown": "# Project Report\n\n## Summary\n\nQ4 revenue grew **32%** year-over-year.\n\n## Key Metrics\n\n| Metric | Value |\n|--------|-------|\n| Revenue | $1.2M |\n| Users | 45,000 |\n| Uptime | 99.97% |\n\n## Next Steps\n\n1. Launch mobile SDK\n2. Expand EU infrastructure\n3. SOC 2 certification"
+ }' \
+ --output report.pdfHTML Report with Charts
+Embed inline SVG charts in your HTML for data-driven reports — no JavaScript or external libraries needed.
+ +
+ HTML — report with SVG bar chart
+
+
+ <html>
+<body style="font-family: sans-serif; padding: 40px;">
+ <h1>Quarterly Revenue</h1>
+
+ <svg width="400" height="200" viewBox="0 0 400 200">
+ <!-- Bars -->
+ <rect x="20" y="120" width="60" height="80" fill="#34d399"/>
+ <rect x="110" y="80" width="60" height="120" fill="#34d399"/>
+ <rect x="200" y="50" width="60" height="150" fill="#34d399"/>
+ <rect x="290" y="20" width="60" height="180" fill="#34d399"/>
+ <!-- Labels -->
+ <text x="50" y="115" text-anchor="middle" font-size="12">$80k</text>
+ <text x="140" y="75" text-anchor="middle" font-size="12">$120k</text>
+ <text x="230" y="45" text-anchor="middle" font-size="12">$150k</text>
+ <text x="320" y="15" text-anchor="middle" font-size="12">$180k</text>
+ </svg>
+</body>
+</html>
+ curl
+
+ curl -X POST https://api.docfast.dev/v1/convert/html \
+ -H "Authorization: Bearer YOUR_API_KEY" \
+ -H "Content-Type: application/json" \
+ -d @report.json \
+ --output chart-report.pdfReceipt / Confirmation PDF
+Generate a simple receipt or order confirmation — perfect for e-commerce and SaaS billing.
+ +
+ HTML — receipt template
+
+ <html>
+<body style="font-family: sans-serif; max-width: 400px; margin: 0 auto; padding: 40px;">
+ <div style="text-align: center; margin-bottom: 24px;">
+ <h2 style="margin: 0;">Payment Receipt</h2>
+ <p style="color: #888;">Feb 20, 2026</p>
+ </div>
+
+ <hr style="border: none; border-top: 1px dashed #ccc;">
+
+ <p><strong>Order:</strong> #ORD-98712</p>
+ <p><strong>Customer:</strong> jane@example.com</p>
+
+ <table style="width: 100%; margin: 16px 0;">
+ <tr>
+ <td>Pro Plan</td>
+ <td style="text-align: right;">$29.00</td>
+ </tr>
+ <tr>
+ <td>Tax</td>
+ <td style="text-align: right;">$2.90</td>
+ </tr>
+ </table>
+
+ <hr style="border: none; border-top: 1px dashed #ccc;">
+
+ <p style="text-align: right; font-size: 1.3em;">
+ <strong>Total: $31.90</strong>
+ </p>
+ <p style="text-align: center; color: #34d399; margin-top: 24px;">
+ ✓ Payment successful
+ </p>
+</body>
+</html>Node.js Integration
+A complete Node.js script to generate a PDF and save it to disk. Works with Node 18+ using native fetch.
+ +
+ JavaScript — generate-pdf.mjs
+
+ const html = `
+ <h1>Hello from Node.js</h1>
+ <p>Generated at ${new Date().toISOString()}</p>
+`;
+
+const res = await fetch("https://api.docfast.dev/v1/convert/html", {
+ method: "POST",
+ headers: {
+ "Authorization": `Bearer ${process.env.DOCFAST_API_KEY}`,
+ "Content-Type": "application/json",
+ },
+ body: JSON.stringify({ html }),
+});
+
+if (!res.ok) throw new Error(`API error: ${res.status}`);
+
+const buffer = Buffer.from(await res.arrayBuffer());
+await import("fs").then(fs =>
+ fs.writeFileSync("output.pdf", buffer)
+);
+
+console.log("✓ Saved output.pdf");Python Integration
+Generate a PDF from Python using the requests library. Drop this into any Flask, Django, or FastAPI app.
+ Python — generate_pdf.py
+
+ import os
+import requests
+
+html = """
+<h1>Hello from Python</h1>
+<p>This PDF was generated via the DocFast API.</p>
+<ul>
+ <li>Fast rendering</li>
+ <li>Pixel-perfect output</li>
+ <li>Simple REST API</li>
+</ul>
+"""
+
+response = requests.post(
+ "https://api.docfast.dev/v1/convert/html",
+ headers={
+ "Authorization": f"Bearer {os.environ['DOCFAST_API_KEY']}",
+ "Content-Type": "application/json",
+ },
+ json={"html": html},
+)
+
+response.raise_for_status()
+
+with open("output.pdf", "wb") as f:
+ f.write(response.content)
+
+print("✓ Saved output.pdf")